[issue36078] argparse: positional with type=int, default=SUPPRESS raise ValueError

[yang]

yang  added the comment:

I ran into the same issue and looked into the code, and found it more 
complicated than I thought. The more I went on, more issues occur. I wonder if 
I should open a new issue, but I will first comment here. If you feel like this 
should be a new issue, I will open one then. And I apologize in advance for 
possible vaguenesses in this comment because I modified it several times as I 
explored the code and found more issues. (also because of my poor English):)

It seems the issue happens only on positional arguments but not optional ones. 
Empty optional arguments will not call `take_action` and default values are 
handled and converted after consuming all arguments.

It also leads to inconsistancy between positional and optional arguments 
behaviour. Positional arguments always go through `take_action`, but optional 
arguments don't if an argument doesn't appear.

This inconsistancy causes another I think is strange behaviour,

parser = ArgumentParser()
parser.add_argument('i', action='count')
parser.parse_args([])

got

Namespace(i=1)

On the other hand, in `_get_values` function, `_check_value` is called to 
handle `choices=`, but there is no such guard for optional arguments, which 
means,

parser = ArgumentParser()
parser.add_argument('-i', nargs='?', type=int, default='2', choices=[1])
parser.parse_args([])

doesn't raise an error.

Besides Paul's two instructive solutions, I think it better to make both sides 
behave the same. However, I found things seem not that simple.

First, ZERO_OR_MORE, no default value, positional arguments have 
`required=True` by default, but

parser.add_argument('foo', nargs='*')
parser.parse_args([])

got no problems. So it at least appears not required. (The document says 
`required` is only for optionals, so I guess it's just a implementation level 
but not a user level thing)

Second, the last case above gives

Namespace(foo=[])

which seems logically incorrect or at least controversial, because the default 
is not set and you give no arguments, how does this list come? The document 
says nothing about the case (it's true it's a very corner one) and it also 
differs from the optional arguments case which gives

Namespace(foo=None)

A walk around which doesn't change it is possible and I've written a patch 
fixing it.
And I'm not sure what we usually do if I propose to make them give the same 
result, is a PEP needed or I just raise a discussion about it? The change might 
break current code.

--
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[issue38921] Max Recursion Depth Reached in Logging Library

[yang]

yang  added the comment:

You assigned a handler to a variable `formatter`, and then called 
`setFormatter(formatter)`, but `formatter` is in fact a handler. The two 
classes `Formatter` and `Handler` happen to have a same name method `format` 
which is called when logging. So what happend is the logger wants to format 
your logging string, and it calls its handlers' `format` method. And in this 
handler's `format` method, the handler calls its formatter's `format` method, 
which ends to be another handler rather than a real formatter. And you repeated 
it 1000 times, which caused a 1000-level nested recursion.

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[issue35212] Expressions with format specifiers in f-strings give wrong code position in AST

[yang]

Change by yang :


--
keywords: +patch
nosy: +fhsxfhsx
nosy_count: 2.0 -> 3.0
pull_requests: +18760
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/19398

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[issue32729] socket error handling needed

[yang]

yang  added the comment:

If socket error occurred I think it is a timeout error or something. but It's 
not error raising correctly but IndexError which is not correct error MSG.

It will be fixed or None type check needed.

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[issue32729] socket error handling needed

[yang]

Change by yang :


--
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[issue32729] socket error handling needed

[yang]

yang  added the comment:

In the lib/socket.py 

Inside of readinto function, 576 line 
needed None type check or something

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[issue32729] socket error handling needed

[yang]

yang  added the comment:

When timeout error occurred in urllib3.Poolmanager.urlopen(), the built-in 
TimeoutError raised which is not caught in existing timeout exception clause.

Thus, It is caught by 'error' except and it is not checking Nonetype so that 
raising IndexError

It patched that error and detailed in PR-5458

https://github.com/python/cpython/pull/5458

Thank you and sorry for not good at english.

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[issue32729] socket error handling needed

[yang]

yang  added the comment:

Oh.. you are right. 
I think it's my bug. here is code
```
import urllib3
import certifi
from functools import wraps
import signal
from urllib3 import Timeout


def timeoutdec(sec):
def decorator(func):
def _timeout(signum, frame):
raise TimeoutError()

@wraps(func)
def wrapper(*args, **kwargs):
signal.signal(signal.SIGALRM, _timeout)
signal.alarm(sec)
try:
result = func(*args, **kwargs)
finally:
signal.alarm(0)
return result
return wrapper
return decorator


@timeoutdec(2)
def for_test():
timeout = Timeout(connect=10.0, read=2.0)
url = 'http://httpbin.org/delay/7'
method = 'GET'
body = None
headers = None
http = urllib3.PoolManager(timeout=timeout,
   cert_reqs='CERT_REQUIRED',
   ca_certs=certifi.where())
while True:
response = http.urlopen(method, url,
body=body,
headers=headers,
preload_content=True)

print(response.data)


for_test()

```

here is the code that i got same traceback.

maybe the TimeoutError is raised from my code, timeoutdec().

I thought it was python bug. sorry for bothering you.


and I will close my PR-32729.

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[issue6728] To avoid hang up in using CGIXMLRPCRequestHandler under IIS 7.x

[Yang]

New submission from Yang :

The mismatched content length will cause hang up in sys.stdin.read(). 
The reason is probably described in Issue 1214 as well as 1725295.

length = int(os.environ.get('CONTENT_LENGTH', None))
"""Length fix for IIS 7.x to avoid hang up"""
length=length-2

I would appreciate if someone can create a diff or patch file for the 
code above.

--
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messages: 91707
nosy: sjtuer
severity: normal
status: open
title: To avoid hang up in using CGIXMLRPCRequestHandler under IIS 7.x
type: feature request
versions: Python 2.6

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[issue46179] Delete selected item generate "<>" event or not in different version of tkinter or Python

[Jason Yang]

New submission from Jason Yang :

In python(3.8.10)/tkinter(8.6.9), it won't generate "<>" event 
if we delete selected item of ttk.Treeview, but it will for 
python(3.9.9/3.10.1)/tkinter(8.6.12).

Check it just by clicking 'Delete Item 1' button in following demo code

```python
import sys
from random import randint
from datetime import datetime
import tkinter as tk
from tkinter import ttk

def button_callback():
button.configure(state='disabled')
treeview.delete(1)

def treeview_callback(event):
print(datetime.now().strftime("%H:%M:%S"), "Treeview selection changed !")

print(f"Python version : {sys.version.split(' ')[0]}")
print(f"tkinter version: {tk.Tcl().eval('info patchlevel')}")

columns = ('President', 'Birthday')
data = [
('Ronald Reagan', 'February 6'),
('Abraham Lincoln', 'February 12'),
('George Washington', 'February 22'),
('Andrew Jackson', 'March 15'),
('Thomas Jefferson', 'April 13'),
]

root = tk.Tk()

treeview = ttk.Treeview(root, columns=columns, height=5, show='headings')
treeview.pack()
for column in columns:
treeview.heading(column, text=column)
treeview.column(column, width=150)
for i, row in enumerate(data):
treeview.insert('', i, iid=i, text=str(i), values=row)
treeview.selection_set(1)

button = tk.Button(root, text='Delete Item 1', command=button_callback)
button.pack()

treeview.bind("<>", treeview_callback)

root.mainloop()
```

```python
d:\>python test3.py
Python version : 3.8.10
tkinter version: 8.6.9
17:57:43 Treeview selection changed !

d:\>python test3.py
Python version : 3.9.9
tkinter version: 8.6.12
17:58:10 Treeview selection changed !
17:58:11 Treeview selection changed !

d:\>python test3.py
Python version : 3.10.1
tkinter version: 8.6.12
18:01:10 Treeview selection changed !
18:01:12 Treeview selection changed !
```

--
components: Tkinter
messages: 409185
nosy: Jason990420
priority: normal
severity: normal
status: open
title: Delete selected item generate "<>" event or not in 
different version of tkinter or Python
type: behavior
versions: Python 3.10, Python 3.8, Python 3.9

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[issue46180] Button clicked failed when mouse hover tooltip and tooltip destroyed

[Jason Yang]

New submission from Jason Yang :

Button no response when clicked if mouse move into tooltip and tooltip 
destroyed for Python 3.9.9/3.10.1 and tkinter 8.6.12

You can check it by moving mouse into button, then move to tooltip after it 
shown, then click button and you won't get response for button clicked, but 
"Leave". It is OK for lower version of Python/tkinter.

```python
import sys
from datetime import datetime
import tkinter as tk

class Tooltip(object):
"""
create a tooltip for a given widget
"""
def __init__(self, widget, text='widget info'):
self.waittime = 500 # miliseconds
self.widget = widget
self.text = text
self.widget.bind("", self.enter)
self.widget.bind("", self.leave)
self.widget.bind("", self.leave)
self.id = None
self.top = None

def enter(self, event=None):
print(now(), "Enter")
self.schedule()

def leave(self, event=None):
print(now(), "Leave")
self.unschedule()
self.hidetip()

def schedule(self):
self.unschedule()
self.id = self.widget.after(self.waittime, self.showtip)

def unschedule(self):
id = self.id
self.id = None
if id:
self.widget.after_cancel(id)

def showtip(self, event=None):
x = y = 0
x, y, cx, cy = self.widget.bbox("insert")
x += self.widget.winfo_rootx() + self.widget.winfo_width()//2
y += self.widget.winfo_rooty() + self.widget.winfo_height()//2
self.top = tk.Toplevel(self.widget)
self.top.wm_overrideredirect(True)
self.top.wm_geometry("+%d+%d" % (x, y))
label = tk.Label(self.top, text=self.text, bd=1, font=font, 
relief='solid')
label.pack(ipadx=1)

def hidetip(self):
top = self.top
self.top = None
if top:
top.destroy()

def now():
return datetime.now().strftime("%H:%M:%S")

print(f"Python version : {sys.version.split(' ')[0]}")
print(f"tkinter version: {tk.Tcl().eval('info patchlevel')}")

font = ("Courier New", 40)

root = tk.Tk()
button = tk.Button(root, text="button", font=font,
command=lambda:print(now(), 'Button clicked'))
button.pack(padx=10, pady=5)
tooltip = Tooltip(button, 'This is button 1')

root.mainloop()
```

```python
d:\>python test.py
Python version : 3.10.1
tkinter version: 8.6.12
18:21:52 Enter (Mouse to button)
18:21:54 Leave (mouse to tooltip)
18:21:55 Leave (button clicked get no response)
18:21:57 Leave (button clicked get no response)
18:21:58 Leave (button clicked get no response)

d:\>python test.py
Python version : 3.9.9
tkinter version: 8.6.12
18:22:51 Enter (Mouse to button)
18:22:54 Leave (mouse to tooltip)
18:22:55 Leave (button clicked get no response)
18:22:56 Leave (button clicked get no response)
18:22:57 Leave (button clicked get no response)

d:\>python test.py
Python version : 3.8.10
tkinter version: 8.6.9
18:23:22 Enter (Mouse to button)
18:23:23 Leave (mouse to tooltip)
18:23:23 Enter (mouse stay, and it will repeat `Enter and Leave` again and 
again)
18:23:24 Leave
...
18:23:28 Enter
18:23:28 Leave
18:23:28 Button clicked (button clicked get response)
18:23:31 Leave
18:23:31 Button clicked (button clicked get response)
18:23:32 Leave
```

Platform - WIN10

--
components: Tkinter
messages: 409188
nosy: Jason990420
priority: normal
severity: normal
status: open
title: Button clicked failed when mouse hover tooltip and tooltip destroyed
type: crash
versions: Python 3.10, Python 3.8, Python 3.9

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[issue46179] Delete selected item generate "<>" event or not in different version of tkinter or Python

[Jason Yang]

Jason Yang  added the comment:

>From https://core.tcl-lang.org/tk/reportlist, I found the same issue

ttk::treeview <> event bug 
https://core.tcl-lang.org/tk/tktview?name=2a6c62afd9

It is an old bug from 2014 anf not fixed, and now it fixed.
OK, no more question about it.

Thank you for your information.



B.R.,

Jason Yng

--
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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[issue46464] concurrent.futures.ProcessPoolExecutor can deadlock when tcmalloc is used

[Yilei Yang]

New submission from Yilei Yang :

When Python is built and linked with tcmalloc, using ProcessPoolExecutor may 
deadlock. Here is a reproducible example:

$ cat t.py
from concurrent import futures
import sys
def work(iteration, item):
  sys.stdout.write(f'working: iteration={iteration}, item={item}\n')
  sys.stdout.flush()
for i in range(0, 1):
with futures.ProcessPoolExecutor(max_workers=2) as executor:
executor.submit(work, i, 1)
executor.submit(work, i, 2)

$ python t.py
working: iteration=0, item=1
working: iteration=0, item=2
working: iteration=1, item=1
working: iteration=1, item=2
...
working: iteration=3631, item=1
working: iteration=3631, item=2


The child process fails to finish. It's more likely to reproduce when the 
system is busy.

With some bisect search internally, this commit 
https://github.com/python/cpython/commit/1ac6e379297cc1cf8acf6c1b011fccc7b3da2cbe
 "triggered" the deadlock threshold with tcmalloc.

--
components: Library (Lib)
messages: 411208
nosy: yilei
priority: normal
severity: normal
status: open
title: concurrent.futures.ProcessPoolExecutor can deadlock when tcmalloc is used
versions: Python 3.10, Python 3.11, Python 3.9

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[issue35095] Implement pathlib.Path.append_bytes and pathlib.Path.append_text

[Keelung Yang]

Keelung Yang  added the comment:

@pitrou
Firstly, I can't agree with `it is quite uncommon to open a file in append 
mode`. It should be depended to users and their application scenes.

@pablogsal
Secondly, I think `Path.write_*(, append=False)` is better then adding new 
APIs, as discussed in 
https://stackoverflow.com/questions/57296168/pathlib-path-write-text-in-append-mode

--
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[issue46525] datetime.timestamp() lose precision when the time is too large

[Yilei Yang]

New submission from Yilei Yang :

Examples:

>>> datetime.datetime(, 1, 1, microsecond=99).timestamp()
7952371200.99
>>> datetime.datetime(, 1, 1, microsecond=99).timestamp()
43012195201.0
>>> datetime.datetime(2567, 1, 1, microsecond=98).timestamp()
18839548800.96

I believe this is an issue caused by using `double` in the C implementation.

--
components: Library (Lib)
messages: 411676
nosy: yilei
priority: normal
severity: normal
status: open
title: datetime.timestamp() lose precision when the time is too large
type: behavior
versions: Python 3.10, Python 3.11, Python 3.7, Python 3.8, Python 3.9

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[issue46554] Add append keyword argument to Path.write_text() and Path.write_bytes()

[Keelung Yang]

New submission from Keelung Yang :

Three reasons to improve issue 35095: Implement pathlib.Path.append_bytes and 
pathlib.Path.append_text

1. If I want to append text to log at each startup(before calling basicConfig), 
there is no simple way to do this.

2. Adding append keyword is better then adding new APIs.

3. From stackoverflow: How does this make the classes clean? They already 
contain the write_* methods which are just not flexible enough. If the methods 
(or classes) are not dirty how would e.g. adding an optional parameter 
append=False to them make them dirty? 
https://stackoverflow.com/questions/57296168/pathlib-path-write-text-in-append-mode

So, this patch is just an implementation of discussions in above stackoverflow 
link.

--
files: add-append-arg-to-path.write.patch
keywords: patch
messages: 411929
nosy: keelung-yang
priority: normal
severity: normal
status: open
title: Add append keyword argument to Path.write_text() and Path.write_bytes()
Added file: https://bugs.python.org/file50591/add-append-arg-to-path.write.patch

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[issue46554] Add append keyword argument to Path.write_text() and Path.write_bytes()

[Keelung Yang]

Change by Keelung Yang :


--
components: +Library (Lib)
type:  -> enhancement
versions: +Python 3.11

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[issue46554] Add append keyword argument to Path.write_text() and Path.write_bytes()

[Keelung Yang]

Keelung Yang  added the comment:

@barneygale,
This is for simplifying code and improve readability, since `Readability 
counts` in The Zen of Python.

Users needn't two lines code to append a file. And there is a minimal modifying 
to reach it.

If inexperienced users are falling into the hole, just let them in and then 
learned sth. Because they will go out of the hole sooner or later. 

And finally, two lines cann't prevent them from falling into the hole.

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[issue46554] Add append keyword argument to Path.write_text() and Path.write_bytes()

[Keelung Yang]

Keelung Yang  added the comment:

This shouldn't be limited logging.
In unstable application scene, file should be append and then close immediately 
to avoid breaking filesystem (e.g. inode is not updated timely). Such as 
main.py file in MicroPython development board, user may disconnect USB or press 
reset at anytime without ejecting disk. Or in IVI system, some embedded 
devices, record should be appended immediately.

And if path.write(append=) is not common enough, then what's about built-in 
function open()? What's the purpose of adding read/write functions to 
pathlib.Path?

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[issue46554] Add append keyword argument to Path.write_text() and Path.write_bytes()

[Keelung Yang]

Keelung Yang  added the comment:

In file operations, write/modify/append, which one is generic/common? They're 
all.

Modifying need more then one line code, but write/oppend needn't.

Two lines are bad to readability and readability counts.

How do you determine it's not common enough? There're many kind of users and 
application scene, and this feature is even not existed.

Should we create a poll both to Python developers and it's users?

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[issue46554] Add append keyword argument to Path.write_text() and Path.write_bytes()

[Keelung Yang]

Keelung Yang  added the comment:

Without append kwarg, users need two lines to append. It's bad to both 
readability and writability.

Library developers should focus on bath language and library's design targets, 
but how frequently used. And as all discussed here, at least one applications 
scene(logging) benefited from append kwarg. Right?

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[issue46180] Button clicked failed when mouse hover tooltip and tooltip destroyed

[Jason Yang]

Jason Yang  added the comment:

The platform is WIN10 which shown at last line in first message.
I don't have other platforms to test if ok or not.

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[issue46554] Add append keyword argument to Path.write_text() and Path.write_bytes()

[Keelung Yang]

Keelung Yang  added the comment:

OK. Since most are opposed to append kwarg, I close this issue.
Thanks ALL!

--
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[issue46784] Duplicated symbols when linking embedded Python with libexpat

[Yilei Yang]

New submission from Yilei Yang :

The libexpat 2.4.1 upgrade from https://bugs.python.org/issue44394 introduced 
the following new exported symbols:

testingAccountingGetCountBytesDirect
testingAccountingGetCountBytesIndirect
unsignedCharToPrintable
XML_SetBillionLaughsAttackProtectionActivationThreshold
XML_SetBillionLaughsAttackProtectionMaximumAmplification

We need to adjust Modules/expat/pyexpatns.h

(The newer libexpat upgrade https://bugs.python.org/issue46400 has no new 
symbols).

I'll send a PR.

--
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messages: 413464
nosy: yilei
priority: normal
severity: normal
status: open
title: Duplicated symbols when linking embedded Python with libexpat
versions: Python 3.10, Python 3.11, Python 3.7, Python 3.8, Python 3.9

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[issue46784] Duplicated symbols when linking embedded Python with libexpat

[Yilei Yang]

Change by Yilei Yang :


--
keywords: +patch
pull_requests: +29540
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31397

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[issue46803] Item not shown when using mouse wheel to scroll for Listbox/Combobox

[Jason Yang]

New submission from Jason Yang :

When scrolled items by mouse wheel in tk.Listbox/ttk.Combobox, some items not 
shown.

Is it a bug ? or I did something wrong ?

In following case, 'Wednesday' will not shown when scroll mouse wheel at

- tk.Listbox or vertical scrollbar of tk.Listbox, or
- listbox of ttk.Combo

```python
from tkinter import *
from tkinter import ttk

font = ('Courier New', 24)
lst = ('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 
'Saturday')

root = Tk()

frame1 = Frame(root)
frame1.pack(side=LEFT)
vsb1 = Scrollbar(frame1, orient='v')
vsb1.pack(side=RIGHT, fill='y')
var = StringVar()
var.set(lst)
listbox = Listbox(frame1, width=10, height=3, listvariable=var, font=font, 
yscrollcommand=vsb1.set)
listbox.pack(side=LEFT)
vsb1.configure(command=listbox.yview)

frame2 = Frame(root)
frame2.pack(side=LEFT, fill='y')
combobox = ttk.Combobox(frame2, values=lst, width=10, height=3, font=font)
combobox.pack()

root.mainloop()
```

Platform: WIN10

--
components: Tkinter
files: PeS9r.png
messages: 413564
nosy: Jason990420
priority: normal
severity: normal
status: open
title: Item not shown when using mouse wheel to scroll for Listbox/Combobox
type: behavior
versions: Python 3.8, Python 3.9
Added file: https://bugs.python.org/file50634/PeS9r.png

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[issue46825] slow matching on regular expression

[Heran Yang]

New submission from Heran Yang :

I'm using `re.fullmatch` to match a string that only contains 0 and 1. The 
regular expression is: (0+|1(01*0)*1)+

It runs rather slow with Python 3.7, but when I try using regex in C++, with 
std::regex_constants::__polynomial, it works well.

Would someone take a look at it? Thx.

--
components: Regular Expressions
files: match.py
messages: 413700
nosy: HeRaNO, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: slow matching on regular expression
type: performance
versions: Python 3.7
Added file: https://bugs.python.org/file50636/match.py

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[issue46899] use of uninitialized value with msan from subprocess_fork_exec

[Yilei Yang]

New submission from Yilei Yang :

The uid & gid variable from 
https://github.com/python/cpython/blob/9833bb91e4d5c2606421d9ec2085f5c2dfb6f72c/Modules/_posixsubprocess.c#L737-L738
 can be passed to the `do_fork_exec` call below uninitialized and cause msan to 
report use-of-uninitialized-value errors.

Those variables are guarded by call_setgid/call_setuid so they aren't really 
used uninitialized in practice. It would just be great if we can make it msan 
clean.

Ideally, the long list of do_fork_exec arguments could also be rewritten in a 
struct.

--
components: Library (Lib)
messages: 414320
nosy: gregory.p.smith, yilei
priority: normal
severity: normal
status: open
title: use of uninitialized value with msan from subprocess_fork_exec
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.9

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[issue13542] Memory leak in multiprocessing.pool

[Yang Zhang]

New submission from Yang Zhang :

Calling Pool.map (and friends) on empty lists [] causes Pool._cache to hang on 
to the MapResults forever:

tp = ThreadPool(5)
xs = tp.map(lambda x: 'a' * int(10e6), range(100))
# now using 1GB mem = 100 * 10MB strs
del xs
gc.collect()
# still using 1GB mem
tp.close(); tp.join()
# now using ~0GB mem

--
components: Library (Lib)
messages: 148937
nosy: yang
priority: normal
severity: normal
status: open
title: Memory leak in multiprocessing.pool
type: resource usage
versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4

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[issue13542] Memory leak in multiprocessing.pool

[Yang Zhang]

Yang Zhang  added the comment:

Oops, sorry - pasted a wrong example.


In [38]: tp = ThreadPool(5)

In [39]: xs = tp.map(lambda x: x, [])

In [40]: xs
Out[40]: []

In [41]: tp._cache
Out[41]: {3: }

--

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[issue11226] subprocesses experience mysterious delay in receiving stdin EOF

[Yang Zhang]

New submission from Yang Zhang :

I'm seeing this issue on all the multiple Ubuntu 10.04 boxes I've tried.

I reduced a problem I was seeing in my application down into the following test 
case. In this code, a parent process concurrently spawns 2 (you can spawn more) 
subprocesses that read a big message from the parent over stdin, sleep for 5 
seconds, and write something back. However, there's unexpected waiting 
happening somewhere, causing the code to complete in 10 seconds instead of the 
expected 5.

If you set verbose=True, you can see that the straggling subprocess is 
receiving most of the messages, then waiting for the last chunk of 3 
chars---it's not detecting that the pipe has been closed. Furthermore, if I 
simply don't do anything with the second process (doreturn=True), the first 
process will never see the EOF.

Further down is some example output. When trying this out, you may need to 
increase the message size to see the behavior occur.

from subprocess import *
from threading import *
from time import *
from traceback import *
import sys
verbose = False
doreturn = False
msg = (20*4096+3)*'a'
def elapsed(): return '%7.3f' % (time() - start)
if sys.argv[1:]:
  start = float(sys.argv[2])
  if verbose:
for chunk in iter(lambda: sys.stdin.read(4096), ''):
  print >> sys.stderr, '..', time(), sys.argv[1], 'read', len(chunk)
  else:
sys.stdin.read()
  print >> sys.stderr, elapsed(), '..', sys.argv[1], 'done reading'
  sleep(5)
  print msg
else:
  start = time()
  def go(i):
print elapsed(), i, 'starting'
p = Popen(['python','stuckproc.py',str(i), str(start)], stdin=PIPE, 
stdout=PIPE)
if doreturn and i == 1: return
print elapsed(), i, 'writing'
p.stdin.write(msg)
print elapsed(), i, 'closing'
p.stdin.close()
print elapsed(), i, 'reading'
p.stdout.read()
print elapsed(), i, 'done'
  ts = [Thread(target=go, args=(i,)) for i in xrange(2)]
  for t in ts: t.start()
  for t in ts: t.join()

Example output:

  0.001 0 starting
  0.003 1 starting
  0.005 0 writing
  0.016 1 writing
  0.093 0 closing
  0.093 0 reading
  0.094 1 closing
  0.094 1 reading
  0.098 .. 1 done reading
  5.103 1 done
  5.108 .. 0 done reading
 10.113 0 done

--
components: Library (Lib)
messages: 128699
nosy: yaaang
priority: normal
severity: normal
status: open
title: subprocesses experience mysterious delay in receiving stdin EOF
type: behavior
versions: Python 2.6

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[issue11226] subprocesses experience mysterious delay in receiving stdin EOF

[Yang Zhang]

Yang Zhang  added the comment:

After way too much time, I figured it out, after a quote from this post jumped 
out at me:

  See the "I/O on Pipes and FIFOs" section of pipe(7) ("man 7 pipe")

  "If all file descriptors referring to the write end of a pipe have
  been closed, then an attempt to read(2) from the pipe will see end-of-
  file (read(2) will return 0)."

I should've known this, but it never occurred to me - had nothing to do with 
Python in particular. What was happening was: the subprocesses were getting 
forked with open (writer) file descriptors to each others' pipes. As long as 
there are open writer file descriptors to a pipe, readers won't see EOF.

E.g.:

  p1=Popen(..., stdin=PIPE, ...)
# creates a pipe the parent process can write to
  p2=Popen(...)
# inherits the writer FD - as long as p2 exists, p1 won't see EOF

Turns out there's a close_fds parameter to Popen, so the solution is to pass 
close_fds=True. All simple and obvious in hindsight, but still managed to cost 
at least a couple eyeballs good chunks of time.

--
resolution:  -> invalid
status: open -> closed

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[issue3145] help> modules os raises UnicodeDecodeError

[Michael Yang]

New submission from Michael Yang <[EMAIL PROTECTED]>:

>>> help()
help> modules os
Here is a list of matching modules.  Enter any module name to get more help.

posix - This module provides access to operating system
...
stringprep - Library that exposes various tables found in the StringPrep
RFC 3454.
Traceback (most recent call last):
  File "", line 1, in 
...
File "/home/michael/python3/3.0b1/lib/python3.0/codecs.py", line 300, in
decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 8-11:
invalid data

--
components: Interpreter Core
messages: 68419
nosy: msyang
severity: normal
status: open
title: help> modules os raises UnicodeDecodeError
type: behavior
versions: Python 3.0

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[issue3635] pickle.dumps cannot save instance of dict-derived class that overrides __getattribute__

[Michael Yang]

New submission from Michael Yang <[EMAIL PROTECTED]>:

# pickle.dumps is not able to process an instance of
# a class that inherits from 'dict' and
# overrides the built-in __getattribute__ method
# but can successfully process one that 
# overrides the__getattr__ method

>>> class Examp1(dict):
...   def __getattr__(self,name):
... return self[name]
... 
>>> class Examp2(dict):
...   def __getattribute__(self,name):
... return self[name]
... 
>>> ex1 = Examp1()
>>> ex2 = Examp2()
>>> ex1['aKey'] = (3,4)
>>> ex2['aKey2'] = (4,5)
>>> ex1
{'aKey': (3, 4)}
>>> ex1.aKey
(3, 4)
>>> ex2
{'aKey2': (4, 5)}
>>> ex2.aKey2
(4, 5)
>>> import pickle
>>> pickle.dumps(ex1)
b'\x80\x03c__main__\nexamp1\nq\x00)\x81q\x01X\x04\x00\x00\x00aKeyq\x02K\x03K\x04\x86q\x03s}q\x04b.'
>>> pickle.dumps(ex2)
Traceback (most recent call last):
  File "", line 1, in 
  File "[hidden]/python3/3.0b2/common/lib/python3.0/pickle.py", line
1319, in dumps
Pickler(f, protocol).dump(obj)
  File "", line 3, in __getattribute__
KeyError: '__reduce_ex__'

--
components: Extension Modules
messages: 71671
nosy: msyang
severity: normal
status: open
title: pickle.dumps cannot save instance of dict-derived class that overrides 
__getattribute__
type: behavior
versions: Python 2.5, Python 3.0

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[issue3709] BaseHTTPRequestHandler innefficient when sending HTTP header

[Yang Zhao]

New submission from Yang Zhao <[EMAIL PROTECTED]>:

send_header() in BaseHTTPRequestHandler currently does a write to socket
every time send_header() is called. This results in excessive number of
TCP packets being regenerated. Ideally, as much of the HTTP packet is
buffered as possible, but, at minimum, the header should be sent with a
single write as there is a convenient end_header() functional available.

Behaviour is observed under python 2.5, but the related code looks
identical in SVN trunk.

Will contribute patch if request is deemed reasonable but no one is
available to work on it; I just need a few days.

--
components: Library (Lib)
messages: 72051
nosy: yangman
severity: normal
status: open
title: BaseHTTPRequestHandler innefficient when sending HTTP header
type: performance
versions: Python 2.5

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[issue8161] inconsistency behavior in ctypes.c_char_p dereferencing

[Jackson Yang]

New submission from Jackson Yang :

# Python 3.1.2rc1 (r312rc1:78742, Mar  7 2010, 07:49:40)
# [MSC v.1500 32 bit (Intel)] on win32
import ctypes

class T(ctypes.Structure):
_fields_ = (
('member', ctypes.c_char * 16),
)

# dereference a c_char_Array variable would return 
print('%r'%((ctypes.c_char * 16)()[:]))
# dereference from a c_char_Array member would return , which is buggy
print('%r'%(T().member[:]))

--
assignee: theller
components: ctypes
messages: 101214
nosy: nullnil, theller
severity: normal
status: open
title: inconsistency behavior in ctypes.c_char_p dereferencing
type: behavior
versions: Python 3.2

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[issue4584] doctest fails to display bytes type

[Michael Yang]

New submission from Michael Yang <[EMAIL PROTECTED]>:

doctest.testmod() fails when attempting to echo back a bytes type with
ord() > 128.


def ok():
   """
>>> bytes([255,])
b'\xff'

"""
pass

def notOK():
"""
>>> b'\xff'

"""
pass

import doctest
doctest.testmod()

Traceback (most recent call last):
...
UnicodeEncodeError: 'ascii' codec can't encode character '\xff' in
position 141: ordinal not in range(128)

--
components: Extension Modules
messages: 77264
nosy: msyang
severity: normal
status: open
title: doctest fails to display bytes type
type: behavior
versions: Python 3.0

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[issue4886] test/regrtest.py contains error on __import__

[Michael Yang]

New submission from Michael Yang :

I want to use the included test.regrtest (located in 
$pythondir/lib/python[ver]/test) to regression test some of my own 
scripts located in directory myDir.  The script has some nice 
configurability features to skip some tests based on machine 
configurations, etc. that a vanilla unittest suite doesn't include 
automatically.  However, it seems that the script regrtest.py has an 
error following the __import__ line.

Here's my setup:

/sample.py
/myDir
/__init__.py
/test_file1.py
/test_file2.py
/...

in sample.py:

{{{
#!python
#!/usr/bin/env python
import test.regrtest as rt
rt.main(tests = ['myDir.test_file1','myDir.test_file2'], \
quiet = False, verbose = True)
}}}

running sample.py yields:

{{{
#!sh
myDir.test_file1
myDir.test_file1 skipped -- No module named myDir.test_file1
myDir.test_file2
myDir.test_file2 skipped -- No module named myDir.test_file2
2 tests skipped:
myDir.test_file1 myDir.test_file2
2 skips unexpected on win32:
myDir.test_file1 myDir.test_file2
}}}

This is due to the code snippet in regrtest.py around line 554:

{{{
#!python
...
if test.startswith('test.'):
abstest = test
else:
# Always import it from the test package
abstest = 'test.' + test
the_package = __import__(abstest, globals(), locals(), [])
the_module = getattr(the_package, test)
...
}}}

should be changed to:
{{{
#!python
...
if test.startswith('test.'):
abstest = test
modName = test[len('test.'):]
else:
# Always import it from the test package
abstest = 'test.' + test
modName = test
the_package = __import__(abstest, globals(), locals(), [])
the_module = getattr(the_package, modName)
...
}}}

This way, the the_module will correctly find the module name in 
'the_package'.

A further recommendation: the main() module should be able to work with 
test directories with name other than 'test.*'.  Otherwise, users 
wishing to use the main() on other directories will have to name them 
'test.'  Depending on the user's directory's position in sys.path 
(before or after $pythondir/lib/python[ver]), regrtest.main() will 
either fail due to the 'from test import ...' statements being shadowed 
by the user's 'test' directory or the user's 'test' directory being 
shadowed by the standard library's.

--
components: Library (Lib)
messages: 79442
nosy: msyang
severity: normal
status: open
title: test/regrtest.py contains error on __import__
versions: Python 2.6, Python 3.0

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[issue4886] test/regrtest.py contains error on __import__

[Michael Yang]

Changes by Michael Yang :


--
type:  -> behavior

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[issue37846] declare that Text I/O use buffer inside

[Windson Yang]

New submission from Windson Yang :

At the beginning of https://docs.python.org/3.7/library/io.html#io.RawIOBase, 
we declared that 

> Binary I/O (also called buffered I/O)
and 
> Raw I/O (also called unbuffered I/O)

But we didn't mention if Text I/O use buffer or not which led to confusion. 
Even though we talked about it later in 
https://docs.python.org/3.7/library/io.html#class-hierarchy

> The TextIOBase ABC, another subclass of IOBase, deals with streams whose 
> bytes represent text, and handles encoding and decoding to and from strings. 
> TextIOWrapper, which extends it, is a buffered text interface to a buffered 
> raw stream (BufferedIOBase). Finally, StringIO is an in-memory stream for 
> text.

IMO, it will be better to declare 'Reads and writes are internally buffered in 
order to speed things up' at the very beginning in 

> Text I/O
> Text I/O expects and produces str objects...

or maybe

> class io.TextIOBase
> Base class for text streams. This class provides a character and line based 
> interface to stream I/O. It inherits IOBase. There is no public constructor.

--
assignee: docs@python
components: Documentation
messages: 349633
nosy: Windson Yang, docs@python
priority: normal
severity: normal
status: open
title: declare that Text I/O use buffer inside
type: enhancement
versions: Python 3.8

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[issue37846] declare that Text I/O use buffer inside

[Windson Yang]

Windson Yang  added the comment:

I found the document is not that clear when I try to understand what happens 
when Python read/write a file. I'm not sure who also needs this information. As 
you said, It wouldn't help the user program in Python. However, make it more 
clear maybe help users have a better feeling of what is happening under the 
hood.

--

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[issue38125] Can' build document in Sphinx v2.2.0

[Windson Yang]

New submission from Windson Yang :

I got two errors when I try to build python document with

make venv
make html

The first one is 

> Since v2.0, Sphinx uses "index" as master_doc by default. Please add 
> "master_doc = 'contents'" to your conf.py.

After fixing this one, the second one is 

> /Users/windson/learn/cpython/Doc/library/email.message.rst:4:duplicate object 
> description of email.message, other instance in 
> library/email.compat32-message, use :noindex: for one of them

--
assignee: docs@python
components: Documentation
messages: 352034
nosy: Windson Yang, docs@python
priority: normal
severity: normal
status: open
title: Can' build document in Sphinx v2.2.0
type: crash
versions: Python 3.9

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[issue38125] Can' build document in Sphinx v2.2.0

[Windson Yang]

Change by Windson Yang :


--
stage:  -> resolved
status: open -> closed

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[issue38626] small change at bisect_left function for easy understanding

[Windson Yang]

New submission from Windson Yang :

bisect_left should be similar to bisect_right. However, the current implement 
didn't reflect it. A little bit update for the bisect_left function could make 
the user easy to understand their relation.

def bisect_left(a, x, lo=0, hi=None):
if lo < 0:
raise ValueError('lo must be non-negative')
if hi is None:
hi = len(a)
while lo < hi:
mid = (lo+hi)//2
# <= should be the only difference between bisect_left and bisect_right
if x <= a[mid]: hi = mid
else: lo = mid+1
return lo

--
components: Library (Lib)
messages: 355606
nosy: Windson Yang
priority: normal
severity: normal
status: open
title: small change at bisect_left function for easy understanding
versions: Python 3.8

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[issue43628] Incorrect argument errors for random.getstate()

[Yang Feng]

New submission from Yang Feng :

In documentation of random.getstate(), it says:
“random.getstate()
Return an object capturing the current internal state of the generator. This 
object can be passed to setstate() to restore the state.”

random.getstate() takes 0 argument and return the current setting for the 
weekday to start each week. However, when I give one argument to 
random.getstate(), the interpreter reports the following error:
--
>>> import random
>>> random.getstate(1)
Traceback (most recent call last):
File "", line 1, in 
TypeError: getstate() takes 1 positional argument but 2 were given
--

Here I have two doubts about the reported errors:
1. Is the TypeError correct? This should be an inconsistent argument number 
error. There is nothing to do with Type. 
2. Is the detailed error correct? Doc says random.getstate() takes 0 argument, 
the reported error says getstate() take 1 positional argument. which is 
inconsistent. Besides, I pass one argument to random.getstate(), but the 
reported error says 2 were given.


Environment: Python 3.10, Ubuntu 16.04

--
assignee: docs@python
components: Documentation
messages: 389535
nosy: CharlesFengY, docs@python
priority: normal
severity: normal
status: open
title: Incorrect argument errors for random.getstate()
versions: Python 3.10

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[issue43940] int casting to float results to a different value in memory

[Huang Yang]

New submission from Huang Yang :

from ctypes import *
import struct

i = int('7f94e57c', 16)
cp = pointer(c_int(i))
fp = cast(cp, POINTER(c_float))
print(fp.contents.value) # nan
print(struct.pack(">f", fp.contents.value).hex()) # 7fd4e57c

# value changed: 7f94e57c -> 7fd4e57c

--
components: Library (Lib), ctypes
messages: 391876
nosy: yang8621
priority: normal
severity: normal
status: open
title: int casting to float results to a different value in memory
type: behavior
versions: Python 3.8

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[issue43940] int casting to float results to a different value in memory

[Huang Yang]

Huang Yang  added the comment:

It's reproducible only if the float is nan, with prefix 7f or ff.
Seems the value is OR operated by 0x0040.

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[issue43940] int casting to float results to a different value in memory

[Huang Yang]

Huang Yang  added the comment:

Also reproducible by:

from ctypes import *
 
i = int('7f94e57c', 16)
cp = pointer(c_int(i))
fp = cast(cp, POINTER(c_float))
print(fp.contents.value) # nan
p = pointer(c_float(fp.contents.value))
ip = cast(p, POINTER(c_int))
print(hex(ip.contents.value)) #'0x7fd4e57c'

--

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[issue43940] int casting to float results to a different value in memory

[Huang Yang]

Huang Yang  added the comment:

OK. Seems it's the default behavior of CPU instruction. And CPU follows the 
IEEE standard of float. 

Is there any workaround?

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[issue12458] Tracebacks should contain the first line of continuation lines

[Edward Yang]

Edward Yang  added the comment:

Supposing I like the old behavior (line number of the end of the statement), is 
there any way to recover that line number from the traceback after this change?

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[issue45210] tp_dealloc docs should mention error indicator may be set

[Edward Yang]

New submission from Edward Yang :

The fact that the error indicator may be set during tp_dealloc is somewhat well 
known 
(https://github.com/posborne/dbus-python/blob/fef4bccfc535c6c2819e3f15384600d7bc198bc5/_dbus_bindings/conn.c#L387)
 but it's not documented in the official manual. We should document it.

A simple suggested patch:


diff --git a/Doc/c-api/typeobj.rst b/Doc/c-api/typeobj.rst
index b17fb22b69..e7c9b13646 100644
--- a/Doc/c-api/typeobj.rst
+++ b/Doc/c-api/typeobj.rst
@@ -668,6 +668,20 @@ and :c:type:`PyType_Type` effectively act as defaults.)
:c:func:`PyObject_GC_Del` if the instance was allocated using
:c:func:`PyObject_GC_New` or :c:func:`PyObject_GC_NewVar`.
 
+   If you may call functions that may set the error indicator, you must
+   use :c:func:`PyErr_Fetch` and :c:func:`PyErr_Restore` to ensure you
+   don't clobber a preexisting error indicator (the deallocation could
+   have occurred while processing a different error):
+
+   .. code-block:: c
+
+ static void foo_dealloc(foo_object *self) {
+ PyObject *et, *ev, *etb;
+ PyErr_Fetch(&et, &ev, &etb);
+ ...
+ PyErr_Restore(et, ev, etb);
+ }
+
Finally, if the type is heap allocated (:const:`Py_TPFLAGS_HEAPTYPE`), the
deallocator should decrement the reference count for its type object after
calling the type deallocator. In order to avoid dangling pointers, the

--
assignee: docs@python
components: Documentation
messages: 401854
nosy: docs@python, ezyang
priority: normal
severity: normal
status: open
title: tp_dealloc docs should mention error indicator may be set
type: enhancement
versions: Python 3.11

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[issue20092] type() constructor should bind __int__ to __index__ when __index__ is defined and __int__ is not

[Patrick Yang]

Patrick Yang  added the comment:

I ended up in this issue after I learnt the following from the Python Library 
Reference Manual.


float(..).

For a general Python object x, float(x) delegates to x.__float__(). If 
__float__() is not defined then it falls back to __index__().


The discussion on __int__() and __index__() was very interesting but I still 
didn't get the answer I wanted.

If __int__() is assumed to be a possibly approximate conversion and it's 
possible that __int__() may exist while __index__() doesn't, shouldn't 
__int__() be used as a fall back before __index__()? 

The downside would be that the resulting float may not be "very close" to the 
original object because __int__() is only an approximation while __index__() 
guarantees exact, but loss of precision is acceptable during type conversion, 
isn't it? (i.e. int(3.14) -> 3). Perhaps it's not acceptable if the conversion 
is a widening conversion and that's why __int__() is skipped?

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[issue36093] UnicodeEncodeError raise from smtplib.verify() method

[Windson Yang]

Windson Yang  added the comment:

Any update?

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[issue36453] pkgutil.get_importer only return the first valid path_hook(importer)

[Windson Yang]

Windson Yang  added the comment:

Any update?

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[issue43185] AssertRaises() causes core dump in handling recursion

[Yang Feng]

New submission from Yang Feng :

Seeing the following program, in the second assertRaises(), function 
"test_invalid_adpcm_state()"  is recursively called. Then a fatal Python error 
shows up and the Python interpreter crashes. 

++
import unittest
import audioop

class TestAudioop(unittest.TestCase):
 pass

def test_invalid_adpcm_state():
 TestAudioop.assertRaises(TypeError, audioop.lin2adpcm, b'\x00', 1, 555)
 TestAudioop.assertRaises(test_invalid_adpcm_state(), 
audioop.adpcm2lin, b'\x00', 1, (0, (- 1)))

TestAudioop = TestAudioop()
test_invalid_adpcm_state()

+++

System Info: Ubuntu 16.04
Python Version:  Python 3.9.1

--
components: Library (Lib)
messages: 386763
nosy: CharlesFengY
priority: normal
severity: normal
status: open
title:  AssertRaises() causes core dump in handling recursion
type: crash
versions: Python 3.9

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[issue43186] Recursive call causes core dump in assertRaises

[Yang Feng]

New submission from Yang Feng :

In following teststr.py, class MyString is nestedly instanced in method 
__getattr__(). This script will lead to a  "core dump" in Python interpreter.  
My Python version is  3.9.1 and my operating system is Ubuntu 16.04. 

teststr.py
+++
class StrError(str):
pass

class MyString:

def __init__(self, istr):
self.__mystr__ = istr

def __getattr__(self, content):
with self:
return MyString(getattr(self.__mystr__, content))

def __setattr__(self, content, sstr):
setattr(self.__mystr__, content)

def __enter__(self):
return self

def __exit__(self, exc_type, exc_val, exc_tb):
 raise StrError(self.__mystr__) 
 return True

MyString("hello")
+

--
components: Library (Lib)
messages: 386764
nosy: CharlesFengY
priority: normal
severity: normal
status: open
title: Recursive call causes core dump in assertRaises
versions: Python 3.9

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[issue43187] Dict creation in recursive function cause interpreter crashes.

[Yang Feng]

New submission from Yang Feng :

In the following programs, dict is created in recursive calls. Then a core dump 
is reported by Python interpreter.
+++
def test_equal_operator_modifying_operand():

class X():

def __del__(DictTest):
dict_b.clear()

def __eq__(DictTest, other):
dict_a.clear()
return True

def __hash__(DictTest):
return 13
dict_d = {X(): 0}

class Y():

def __eq__(DictTest, other):
dict_d.clear()
return True
dict_d = {0: Y()}
# dict_c = {0: set()}
test_equal_operator_modifying_operand()

test_equal_operator_modifying_operand()
+

--
components: Interpreter Core
messages: 386765
nosy: CharlesFengY
priority: normal
severity: normal
status: open
title: Dict creation in recursive function cause interpreter crashes.
type: crash
versions: Python 3.9

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[issue43188] multiple operations of dict causes core dump of Python interpreter.

[Yang Feng]

New submission from Yang Feng :

In the following programs, we call check_reentrant_insertion("s") twice,  after 
multiple of update and clear of dict, the Python interpreter crashes.
+++
def check_reentrant_insertion(mutate):

class Mutating:
def __del__(self):
mutate(d)

d = {k: Mutating() for k in 'abcdefghijklmnopqr'}
for k in list(d):
d[k] = k

def test_reentrant_insertion():

check_reentrant_insertion("s")

def mutate(d):
d.update(DictTest.__dict__)
d.clear()
check_reentrant_insertion(test_reentrant_insertion())

test_reentrant_insertion()
+

System Info: Ubuntu 16.04
Python Version:  Python 3.9.1

--
components: Interpreter Core
messages: 386766
nosy: CharlesFengY
priority: normal
severity: normal
status: open
title:  multiple operations of dict causes core dump of Python 
interpreter.
type: crash
versions: Python 3.9

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[issue43189] decorator function run_with_locale() crashes Python interpreter

[Yang Feng]

New submission from Yang Feng :

We use run_with_locale() as decorator function, then we recursively call 
test_float__format__locale in the following example. Python interpreter crashes.
+++
from test.support import run_with_locale

@run_with_locale('LC_NUMERIC', 'en_US.UTF8')
def test_float__format__locale():
test_float__format__locale()
test_float__format__locale()
+

System Info: Ubuntu 16.04
Python Version:  Python 3.9.1

--
components: Tests
messages: 386767
nosy: CharlesFengY
priority: normal
severity: normal
status: open
title:  decorator function run_with_locale() crashes Python 
interpreter
type: crash
versions: Python 3.9

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[issue43190] < test.support > check_free_after_iterating( ) causes core dump in handling iteration.

[Yang Feng]

New submission from Yang Feng :

In the following program, we call check_free_after_iterating( ) twice, in the 
second time, we recursively call function test_free_after_iterating(). Python 
interpreter crashes.
+++
import unittest
import test.support

class UnicodeTest(unittest.TestCase):
pass

def test_free_after_iterating():
ut = UnicodeTest()
test.support.check_free_after_iterating(ut, iter, str)
test.support.check_free_after_iterating(str, test_free_after_iterating(), 
str)

test_free_after_iterating()
+

System Info: Ubuntu 16.04
Python Version:  Python 3.9.1

--
components: Library (Lib)
messages: 386768
nosy: CharlesFengY
priority: normal
severity: normal
status: open
title: < test.support > check_free_after_iterating( ) causes core dump in 
handling iteration.
type: crash
versions: Python 3.9

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[issue43185] AssertRaises() causes core dump in handling recursion

[Yang Feng]

Yang Feng  added the comment:

Could you please tell me your secret method of getting the minimal script?
I will try to provide minimal ones in our following work.

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[issue35228] Index search in CHM help crashes viewer

[Keelung Yang]

Keelung Yang  added the comment:

It's reoccurable in Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:37:02) 
[MSC v.1924 64 bit (AMD64)] on windows version 10.0.19041.264

Just need to open "Python 3.8 Manuals (64-bit)" --> index --> input 'p' on 
keyboard.

--
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[issue40897] Inheriting from Generic causes inspect.signature to always return (*args, **kwargs) for constructor (and all subclasses)

[Edward Yang]

New submission from Edward Yang :

Consider the following program:

```
import inspect
from typing import Generic, TypeVar

T = TypeVar('T')

class A(Generic[T]):
def __init__(self) -> None:
pass

print(inspect.signature(A))
```

I expect inspect.signature to return () as the signature of the constructor of 
this function. However, I get this:

```
$ python3 foo.py
(*args, **kwds)
```

Although it is true that one cannot generally rely on inspect.signature to 
always give the most accurate signature (because there may always be decorator 
or metaclass shenanigans getting in the way), in this particular case it seems 
especially undesirable because Python type annotations are supposed to be 
erased at runtime, and yet here inheriting from Generic (simply to add type 
annotations) causes a very clear change in runtime behavior.

--
components: Library (Lib)
messages: 370870
nosy: ezyang
priority: normal
severity: normal
status: open
title: Inheriting from Generic causes inspect.signature to always return 
(*args, **kwargs) for constructor (and all subclasses)
type: behavior
versions: Python 3.9

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[issue41105] Add some extra content check in configure process for some empty header file who has been deprecated by glibc

[Jiachen Yang]

Change by Jiachen Yang :


--
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[issue35286] wrong result for difflib.SequenceMatcher

[Boris Yang]

Change by Boris Yang :


--
stage:  -> resolved
status: open -> closed

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[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[Yilei Yang]

New submission from Yilei Yang :

Because unittest adds a `default` filter before tests run, other warnings 
filters are overridden if added before.

Ideally, unittest should not make the warnings less serious, e.g. if there is 
already an 'error' filter that raises exception, it shouldn't "downgrade" to 
'default' that simply prints.

The following example, using lib.a_function() raises exception in a regular 
program, but the unit test passes:

$ cat lib.py
import warnings
class MyWarning(UserWarning):
pass
warnings.filterwarnings('error', category=MyWarning)
def a_function():
  warnings.warn('Do not use.', MyWarning)

$ cat lib_test.py
import unittest
import lib
class TestLib(unittest.TestCase):
def test_function(self):
lib.a_function()
if __name__ == '__main__':
unittest.main()

$ python -m unittest -v lib_test
test_function (lib_test.TestLib) ... lib.py:6: MyWarning: Do not use.
  warnings.warn('Do not use.', MyWarning)
ok

--
Ran 1 test in 0.000s

OK

$ python
>>> import lib
>>> lib.a_function()
Traceback (most recent call last):
  File "", line 1, in 
  File "lib.py", line 6, in a_function
warnings.warn('Do not use.', MyWarning)
lib.MyWarning: Do not use.

--
components: Library (Lib)
messages: 379843
nosy: yilei
priority: normal
severity: normal
status: open
title: unittest overrides more serious warnings filter added before 
unittest.main()
type: behavior
versions: Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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[issue14068] problem with re split

[harvey yang]

harvey yang  added the comment:

i am not use it to split whitespace or newline. i use it to split Chinese full 
stop. and the result is showed at the earlier message.

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[issue14068] problem with re split

[harvey yang]

harvey yang  added the comment:

i see. thanks :)

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[issue14416] syslog missing constants

[Edward Yang]

New submission from Edward Yang :

The syslog module is missing constants for a number of logging priorities 
available on modern Linuxen. In particular, the following options are missing: 
LOG_ODELAY, LOG_AUTHPRIV, LOG_SYSLOG, LOG_UUCP.

--
components: Library (Lib)
messages: 156842
nosy: ezyang
priority: normal
severity: normal
status: open
title: syslog missing constants
type: enhancement
versions: Python 2.7

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[issue14416] syslog missing constants

[Edward Yang]

Edward Yang  added the comment:

I misspoke about UUCP. SYSLOG appears to be missing from the documentation.

Arguably they should be present if Linux supports them, and missing if they 
don't (same as LOG_PERROR, and some of the other constants.) Then you can do 
feature detection Python-side.

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[issue14531] Backtrace should not attempt to open file

[Edward Yang]

New submission from Edward Yang :

When generating a backtrace from an interactive Python session (e.g. the input 
is from , Python attempts to actually find a file named , to 
somewhat hilarious consequences.

See the strace'd Python session below:

>>> foo
open("/etc/default/apport", O_RDONLY|O_LARGEFILE) = 3
Traceback (most recent call last):
  File "", line 1, in 
open("", O_RDONLY|O_LARGEFILE)   = -1 ENOENT (No such file or directory)
open("", O_RDONLY|O_LARGEFILE)   = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/pylint-0.24.0-py2.7.egg/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/logilab_astng-0.22.0-py2.7.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/logilab_common-0.56.1-py2.7.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/unittest2-0.5.1-py2.7.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/GitPython-0.3.2.RC1-py2.7.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/gitdb-0.5.4-py2.7-linux-i686.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/smmap-0.8.1-py2.7.egg/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/async-0.6.1-py2.7-linux-i686.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/decorator-3.3.1-py2.7.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.7.2-py2.7-linux-i686.egg/",
 O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/Sphinx-1.0.7-py2.7.egg/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/docutils-0.8.1-py2.7.egg/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/Jinja2-2.6-py2.7.egg/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/Pygments-1.4-py2.7.egg/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/nose-1.1.2-py2.7.egg/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/home/ezyang/Dev/6.02/", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/home/ezyang/Dev/pyafs/", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/home/ezyang/Dev/wizard/", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/home/ezyang/Dev/twisted/", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/usr/local/lib/python2.6/site-packages/", O_RDONLY|O_LARGEFILE) = 
-1 ENOENT (No such file or directory)
open("/home/ezyang/Work/shared-python/build/lib.linux-i686-2.6/", 
O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
open("/home/ezyang/Work/snarfs/python/coil/", O_RDONLY|O_LARGEFILE) = -1 
ENOENT (No such file or directory)
open("/home/ezyang/Dev/py-github/src/", O_RDONLY|O_LARGEFILE) = -1 
ENOENT (No such file or directory)
open("/usr/lib/python2.7/", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such 
file or directory)
open("/usr/lib/python2.7/plat-linux2/", O_RDONLY|O_LARGEFILE) = -1 
ENOENT (No such file or directory)
open("/usr/lib/python2.7/lib-tk/", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/usr/lib/python2.7/lib-old/", O_RDONLY|O_LARGEFILE) = -1 ENOENT 
(No such file or directory)
open("/usr/lib/python2.7/lib-dynload/", O_RDONLY|O_LARGEFILE) = -1 
ENOENT (No such file or directory)
open("/usr/local/lib/python2.7/dist-packages/", O_RDONLY|O_LARGEFILE) = 
-1 ENOENT (No such file or directory)
open("/usr/lib/python2.7/dist-packages/", O_RDONLY|O_LARGEFILE) = -1 
ENOENT (No such file or directory)
open("/usr/lib/python2.7/dist-packages/Numeric/", O_RDONLY|O_LARGEFILE) 
= -1 ENOENT (No such file or directory)
open("/usr/lib/python2.7/dist-packages/PIL/", O_RDONLY|O_LARGEFILE) = -1 
ENOENT (No such file or directory)
open("/usr/lib/python2.7/dist-packages/gst-0.10/", O_RDONLY|O_LARGEFILE) 
= -1 ENOENT (No such file or directory)
open("/usr/lib/python2.7/dist-packages/gtk-2.0/", O_RDONLY|O_LARGEFILE) 
= -1 ENOENT (No such file or directory)
open("/

[issue14531] Backtrace should not attempt to open file

[Edward Yang]

Edward Yang  added the comment:

"" is a valid name of a file on Unix systems. So the fix is not so clear.

ezyang@javelin:~$ python
Python 2.7.2+ (default, Oct  4 2011, 20:03:08) 
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a
Traceback (most recent call last):
  File "", line 1, in 
Here’s an idea: when a (multi-variable) calculus course arrives at the 
topic of the *chain rule*, it should use as a worked example the multilayer 
perceptron—a topic you usually only find in an introductory artificial 
intelligence course. In fact, it’s ideal, since the treatment of this topic in 
most AI courses (at this point, I’ve taken two—a byproduct of slightly 
mismatched class schedules when you study abroad) involves *no* extra 
theoretical computer science content whatsoever. If you know the definition of 
a multilayer perceptron, any Calculus student who knows the chain rule should 
be able to work out the back-propagation algorithm—or perhaps I should call it 
a *recurrence.* 
NameError: name 'a' is not defined

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[issue36411] Python 3 f.tell() gets out of sync with file pointer in binary append+read mode

[Windson Yang]

Windson Yang  added the comment:

I'm not sure it's a bug. When you write binary data to file (use BufferedIOBase 
by default). It actually writes the data to a buffer. That is why tell() gets 
out of sync. You can follow the instrument belolw. For instance, call flush() 
after writing to get the `correct answer.`

> When writing to this object, data is normally placed into an internal buffer. 
> The buffer will be written out to the underlying RawIOBase object under 
> various conditions, including:

> when the buffer gets too small for all pending data;
> when flush() is called;
> when a seek() is requested (for BufferedRandom objects);
> when the BufferedWriter object is closed or destroyed.

1. https://docs.python.org/3/library/io.html#io.BufferedWriter

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[issue36411] Python 3 f.tell() gets out of sync with file pointer in binary append+read mode

[Windson Yang]

Windson Yang  added the comment:

I think we should mention it at the document, like in the tell() function.

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[issue37073] clarify functions docs in IO modules and Bytes Objects

[Windson Yang]

New submission from Windson Yang :

> PyBytes_FromStringAndSize(const char *v, Py_ssize_t len): 
> Return a new bytes object with a copy of the string v as value and length len 
> on success, and NULL on failure. If v is NULL, the contents of the bytes 
> object are uninitialized.

The function actually copies `len` bytes from string v instead of the whole 
string. (link 1) I suggested we can change to 

> Return a new bytes object with a copy of the first len bytes of string v as 
> value and length len on success...

> readinto(b)
> Read bytes into a pre-allocated, writable bytes-like object b and return the 
> number of bytes read. For example, b might be a bytearray.

The function will call _bufferediobase_readinto_generic(link 2) which may 
return NULL. Maybe we can change to 

> and return the number of bytes that read succeed (it may be smaller than b or 
> NULL if failed)...

1. https://github.com/python/cpython/blob/master/Objects/bytesobject.c#L126

2. https://github.com/python/cpython/blob/master/Modules/_io/bufferedio.c#L962

--
assignee: docs@python
components: Documentation
messages: 343741
nosy: Windson Yang, docs@python
priority: normal
severity: normal
status: open
title: clarify functions docs in IO modules and Bytes Objects
type: enhancement
versions: Python 3.8

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[issue37079] PEM cadata causes ssl.SSLError: nested ans1 error

[Jizhou Yang]

Change by Jizhou Yang :


--
assignee: christian.heimes
components: SSL
nosy: Jizhou Yang, christian.heimes
priority: normal
severity: normal
status: open
title: PEM cadata causes ssl.SSLError: nested ans1 error
type: crash
versions: Python 2.7

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[issue37079] PEM cadata causes ssl.SSLError: nested asn1 error

[Jizhou Yang]

New submission from Jizhou Yang :

Loading cadata in PEM format results in a nested asn1 error. Workaround is to 
convert cadata to unicode.

Minimum code for reproducing the issue:
>>>import ssl
>>> with open('ca.crt') as f:
... ca_crt = f.read()
...
>>> c = ssl.create_default_context()
>>> c.load_verify_locations(cadata=ca_crt)
Traceback (most recent call last):
  File "", line 1, in 
ssl.SSLError: nested asn1 error (_ssl.c:2902)

With workaround to make it work:
>>>import ssl
>>> with open('ca.crt') as f:
... ca_crt = f.read()
...
>>> c = ssl.create_default_context()
>>> c.load_verify_locations(cadata=unicode(ca_crt))

The issue is annoying as the documentation explicitly states cadata to be 
"either an ASCII string of one or more PEM-encoded certificates...". 
Furthermore the unicode function is not present in Python 3.x, making the 
workaround version-dependent.

--
title: PEM cadata causes ssl.SSLError: nested ans1 error -> PEM cadata causes 
ssl.SSLError: nested asn1 error
Added file: https://bugs.python.org/file48373/ca.crt

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[issue37079] PEM cadata causes ssl.SSLError: nested asn1 error

[Jizhou Yang]

Jizhou Yang  added the comment:

Thanks a lot for the quick answer! Verified that the proposed solution works 
with PEM certificates in both Python 2 and 3.

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[issue37073] clarify functions docs in IO modules and Bytes Objects

[Windson Yang]

Windson Yang  added the comment:

Sure. Feel free to edit my PR.

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[issue37073] clarify functions docs in IO modules and Bytes Objects

[Windson Yang]

Change by Windson Yang :


--
keywords: +patch
pull_requests: +13600
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/13713

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[issue37073] clarify functions docs in IO modules and Bytes Objects

[Windson Yang]

Change by Windson Yang :


--
pull_requests: +13602
pull_request: https://github.com/python/cpython/pull/13715

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[issue26468] shutil.copy2 raises OSError if filesystem doesn't support chmod

[Windson Yang]

Change by Windson Yang :


--
keywords: +patch
pull_requests: +13651
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/13765

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[issue37086] time.sleep error message misleading

[Windson Yang]

Windson Yang  added the comment:

I just create a PR for it.

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[issue37086] time.sleep error message misleading

[Windson Yang]

Change by Windson Yang :


--
keywords: +patch
pull_requests: +13652
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/13768

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[issue15474] Differentiate decorator and decorator factory in docs

[Windson Yang]

Windson Yang  added the comment:

Hi, Andrés Delfino. Are you still working on it?

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[issue29750] smtplib doesn't handle unicode passwords

[Windson Yang]

Windson Yang  added the comment:

Sorry, I forgot about this PR, I will update the patch depends on review soon :D

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[issue29750] smtplib doesn't handle unicode passwords

[Windson Yang]

Change by Windson Yang :


--
pull_requests: +14813
pull_request: https://github.com/python/cpython/pull/15064

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[issue29750] smtplib doesn't handle unicode passwords

[Windson Yang]

Windson Yang  added the comment:

I just updated the PR

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[issue30763] There is functionality bug in linecache library.

[Yang Xiao]

New submission from Yang Xiao:

There is a functionality bug in linecache library.

>>test.py<<
import linecache

def test_getline(f):
print linecache.getlines(f)


if __name__ == "__main__":
tf1 = 'aaa'
with open(tf1,'w') as f:
f.write('good morning\n')
test_getline(tf1)

tf2 = 'bbb'
with open(tf2,'w') as f:
f.write('good evening\n')
test_getline(tf2)

tf1 = 'aaa'
with open(tf1,'w') as f:
f.write('good morning 123\n')
test_getline(tf1)

tf2 = 'bbb'
with open(tf2,'w') as f:
f.write('good evening 123\n')
test_getline(tf2)

The expectant output shoule be:
['good morning\n']
['good evening\n']
['good morning\n']
['good evening\n']

However, the script above outputs below:
['good morning\n']
['good evening\n']
['good morning\n']
['good evening\n']

I think there is a bug about implementation of linecache library.

--
components: 2to3 (2.x to 3.x conversion tool)
messages: 296874
nosy: Yang Xiao
priority: normal
severity: normal
status: open
title: There is functionality bug in linecache library.
type: behavior
versions: Python 2.7

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[issue30763] There is functionality bug in linecache library.

[Yang Xiao]

Yang Xiao added the comment:

Sorry, there is a mistake in msg296874.

The expectant output shoule be:
['good morning\n']
['good evening\n']
['good morning 123\n']
['good evening 123\n']

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[issue35251] FTPHandler.ftp_open documentation error

[Windson Yang]

Change by Windson Yang :


--
assignee:  -> docs@python
components: +Documentation -Library (Lib)
nosy: +docs@python

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[issue35273] 'eval' in generator expression behave different in dict from list

[Windson Yang]

Windson Yang  added the comment:

I get NameError for both versions in both 3.4.4, 3.5.2, 3.6.4, 3.7.1

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[issue35289] wrong result for difflib.SequenceMatcher

[Boris Yang]

New submission from Boris Yang :

How to repeat:

# -*- coding: UTF-8 -*-
from difflib import SequenceMatcher
seqMatcher = SequenceMatcher(None, "德阳孩子", "孩子德阳")
seqMatcher.get_matching_blocks()

Expect Result:
[Match(a=0, b=3, size=2), Match(a=2, b=0, size=2), Match(a=5, b=5, size=0)]

Current Result:
[Match(a=0, b=3, size=2), Match(a=5, b=5, size=0)]

--
messages: 330175
nosy: Boris Yang
priority: normal
severity: normal
status: open
title: wrong result for difflib.SequenceMatcher
type: behavior
versions: Python 3.7

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[issue35288] wrong result for difflib.SequenceMatcher

[Boris Yang]

Change by Boris Yang :


--
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status: open -> closed

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[issue35289] wrong result for difflib.SequenceMatcher

[Boris Yang]

Change by Boris Yang :


--
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status: open -> closed

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[issue35287] wrong result for difflib.SequenceMatcher

[Boris Yang]

Change by Boris Yang :


--
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status: open -> closed

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[issue35131] Cannot access to customized paths within .pth file

[Windson Yang]

Windson Yang  added the comment:

I will fix this issue after we have consensus with the future of .pth file in 
#33944

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[issue35267] reproducible deadlock with multiprocessing.Pool

[Windson Yang]

Windson Yang  added the comment:

I will work on it if no one wants to create a PR for this next week.

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[issue35348] Problems with handling the file command output in platform.architecture()

[Windson Yang]

Windson Yang  added the comment:

I agreed with Serhiy. I also found the function decode the output with latin-1, 
I think it will be better to use utf-8 instead.

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[issue35325] imp.find_module() return value documentation discrepancy

[Windson Yang]

Windson Yang  added the comment:

If I understand correctly, this may be better.

Try to find the module name. If path is omitted or None, the list of directory 
names given by sys.path is searched. If path is built-in or frozen modules, 
return None instead.

BTW, the dosstring should also be updated, I will not continue search the path 
if the path in build-in or frozen. and this module is deprecated since version 
3.4

--
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versions: +Python 3.4, Python 3.5, Python 3.6

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