[issue2138] Factorial

[David Albert Torpey]

David Albert Torpey added the comment:

Mr. Dickinson thank you for doing this.  I do not know how to help with 
a patch.  If it helps, here is the code I use in python:

def factorial(n, _known=[1]):
assert isinstance(n, int), "Need an integer. This isn't a gamma"
assert n >= 0, "Sorry, can't factorilize a negative"
assert n < 1000, "No way! That's too large"
try:
return _known[n]
except IndexError:
pass
for i in range(len(_known), n+1):
_known.append(_known[-1] * i)
return _known[n]

When the assertions are turned-off, this runs pretty fast.

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[issue2135] Restructure import.c into PEP 302 importer objects

[Christian Heimes]

Changes by Christian Heimes:


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keywords: +patch
nosy: +brett.cannon, tiran
priority:  -> normal

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[issue708007] TelnetPopen3, TelnetBase, Expect split

[Christian Heimes]

Changes by Christian Heimes:


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[issue2142] naive use of ''.join(difflib.unified_diff(...)) results in bogus diffs with inputs that don't end with end-of-line char

[Christian Heimes]

Changes by Christian Heimes:


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[issue2134] function generate_tokens at tokenize.py yields wrong token for colon

[Christian Heimes]

Changes by Christian Heimes:


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[issue2127] sqlite3 docs should mention utf8 requirement

[Virgil Dupras]

Virgil Dupras added the comment:

+1 I've been pulling my hair off over this one too. Try this on win32:

Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.mkdir(u'foo\xe9')
>>> import sqlite3
>>> con = sqlite3.connect(u'foo\xe9\\my.db')
Traceback (most recent call last):
  File "", line 1, in 
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 3:
ordinal not in range(128)
>>> import sys
>>> sys.getfilesystemencoding()
'mbcs'
>>> con = sqlite3.connect(u'foo\xe9\\my.db'.encode(sys.getfilesystemencoding()))

Traceback (most recent call last):
  File "", line 1, in 
sqlite3.OperationalError: unable to open database file
>>> con = sqlite3.connect(u'foo\xe9\\my.db'.encode('utf-8'))
>>>

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[issue1149798] hotshot.runctx: builtins missing

[Virgil Dupras]

Virgil Dupras added the comment:

Python 2.5.1 (r251:54869, Apr 18 2007, 22:08:04) 
[GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import hotshot
>>> hotshot.Profile('/tmp/hs').runctx('print len',{'__builtins__':
... __builtins__},{})


>>> 

Can we close this now?

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[issue2139] sqlite3 module needs upgrading

[Gerhard Häring]

Gerhard Häring added the comment:

I don't think pysqlite 2.3.2 is very buggy. Otherwise a lot more bug
reports about the pysqlite module would have arrived here. About
backporting fixes to 2.5.3, I'd have to look which ones are isolated and
I could then backport them.

As for SQLite, I'm always for just using the latest DLL and ship it with
Windows. But IMO now we should just ship whatever is in the release
candidate right now.

If the SQLite DLL proves to be a problem, users can always just install
their custom one over the one shipped with Python.

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[issue1149798] hotshot.runctx: builtins missing

[Virgil Dupras]

Virgil Dupras added the comment:

oh crap here goes my ego... pasted the wrong line.

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[issue1149798] hotshot.runctx: builtins missing

[Virgil Dupras]

Virgil Dupras added the comment:

Well, since I brought that issue back, I might as well supply a patch. So 
if indeed it is decided that hotshot.Profile.runctx() should have 
__builtins__ in its globals by default, here is it.

Added file: http://bugs.python.org/file9462/hotshot_builtins_globals.diff

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[issue2114] test_decimal failure on OSX 10.3

[Ronald Oussoren]

Ronald Oussoren added the comment:

I've applied the workaround in revision 60903 (after testing that it 
actually works).

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[issue1600] str.format() produces different output on different platforms (Py30a2)

[Guido van Rossum]

Guido van Rossum added the comment:

I would like Python to follow the C99 rule here. It is practical and
Python has a long tradition of following C where it makes sense.

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[issue1682] Move Demo/classes/Rat.py to Lib/fractions.py and fix it up.

[Guido van Rossum]

Guido van Rossum added the comment:

A C reimplementation of gcd probably makes little sense -- for large
numbers it is dominated by the cost of the arithmetic, and that will
remain the same.

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[issue1682] Move Demo/classes/Rat.py to Lib/fractions.py and fix it up.

[Mark Dickinson]

Mark Dickinson added the comment:

> A C reimplementation of gcd probably makes little sense -- for large
> numbers it is dominated by the cost of the arithmetic, and that will
> remain the same.

That's true for a direct translation of the usual algorithm.   But 
there's a variant due to Lehmer which reduces the number of multi-
precision operations, and dramatically reduces the number of full-
precision divmod operations---they're mostly replaced by n-limb-by-1-
limb multiplications and full-precision additions.  I'd expect at least 
a factor of 2 speedup from using this;  possibly more.  Of course it's 
impossible to tell without implementing it.

I've attached a Python version;  note that:

 * the operations to find x and y at the start of the outer while loop 
are simple lookups when written in C
 * the else branch is taken rarely:  usually once at the beginning of 
any gcd() calculation, and then less than 1 time in 2 on average 
during the reduction.
 * all the arithmetic in the inner while loop is done with numbers <= 
2**15 in absolute value.

Mark

Added file: http://bugs.python.org/file9463/lehmer_gcd.py

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[issue1682] Move Demo/classes/Rat.py to Lib/fractions.py and fix it up.

[Guido van Rossum]

Guido van Rossum added the comment:

I think this is definitely premature optimization. :-)

In any case, before going any further, you should design a benchmark
and defend it.

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[issue1682] Move Demo/classes/Rat.py to Lib/fractions.py and fix it up.

[Mark Dickinson]

Changes by Mark Dickinson:


Removed file: http://bugs.python.org/file9463/lehmer_gcd.py

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[issue1682] Move Demo/classes/Rat.py to Lib/fractions.py and fix it up.

[Mark Dickinson]

Mark Dickinson added the comment:

Replacing lehmer_gcd.py with a revised version.  Even in Python, this 
version is faster than the current one, on my machine, once both numbers 
are greater than 10**650 or so (your crossover points may vary).  It's 
over four times faster for very large inputs (over 10**2).

> In any case, before going any further, you should design a benchmark
> and defend it.

Okay.  I'll stop now :)

Added file: http://bugs.python.org/file9464/lehmer_gcd.py

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[issue2143] smtplib.SSLFakeFile hangs forever if "\n" is not encountered

[Giampaolo Rodola']

New submission from Giampaolo Rodola':

By looking through the smtplib module code I think I've found a
potential issue in the SSLFakeFile class code since there's a while loop
which is supposed to be stopped only when the "\n" character is encountered:

def readline(self):
str = ""
chr = None
while chr != "\n":
chr = self.sslobj.read(1)
str += chr
return str


The patch in attachment just adds a break statement to prevent the while
loop to hang forever in case the "\n" character is never encountered.

--
components: Library (Lib)
files: smptlib.diff
messages: 62569
nosy: facundobatista, giampaolo.rodola, gregory.p.smith
severity: normal
status: open
title: smtplib.SSLFakeFile hangs forever if "\n" is not encountered
type: behavior
versions: Python 2.5, Python 2.6
Added file: http://bugs.python.org/file9465/smptlib.diff

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[issue2144] os.environ should inherit dict

[Martin v. Löwis]

Martin v. Löwis added the comment:

What's the rationale for this change?

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[issue2139] sqlite3 module needs upgrading

[Martin v. Löwis]

Martin v. Löwis added the comment:

Thanks; closing this report as "won't fix", then.

--
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status: open -> closed

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[issue2144] os.environ should inherit dict

[Benjamin Peterson]

New submission from Benjamin Peterson:

This patch changes os.environ to inherit builtin dict rather than UserDict.

--
files: environ-modern.diff
messages: 62571
nosy: gutworth
severity: normal
status: open
title: os.environ should inherit dict
type: rfe
versions: Python 2.6
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[issue2144] os.environ should inherit dict

[Benjamin Peterson]

Benjamin Peterson added the comment:

PEP 390. It's cleaner and faster.

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[issue449227] rlcompleter add "(" to callables feature

[A.M. Kuchling]

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[issue449227] rlcompleter add "(" to callables feature

[A.M. Kuchling]

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[issue602291] Bgen should learn about booleans

[A.M. Kuchling]

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[issue971330] test_signal sucks

[A.M. Kuchling]

A.M. Kuchling added the comment:

In Python 2.6, test_signal.py uses unittest.  It still spawns a shell
script, but I don't understand why this is a problem; is it a
portability issue?

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[issue1038909] pydoc method documentation lookup enhancement

[A.M. Kuchling]

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[issue1040026] os.times() is bogus

[A.M. Kuchling]

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[issue1044479] docs for Py_UNICODE are wrong

[A.M. Kuchling]

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[issue1081824] Rewrite of docs for compiler.visitor

[A.M. Kuchling]

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[issue1106262] semaphore errors from Python 2.3.x on AIX 5.2

[A.M. Kuchling]

A.M. Kuchling added the comment:

Fixed for bug #1234.

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[issue849097] Request: getpos() for sgmllib

[A.M. Kuchling]

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[issue1330538] datetime/xmlrpclib.DateTime comparison

[A.M. Kuchling]

A.M. Kuchling added the comment:

Skip, I can look at xmlrpclib issues.

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[issue1424148] urllib.FancyURLopener.redirect_internal looses data on POST!

[A.M. Kuchling]

A.M. Kuchling added the comment:

Can this item be closed, given jjlee's argument against changing the
behaviour?

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[issue1174606] Reading /dev/zero causes SystemError

[A.M. Kuchling]

A.M. Kuchling added the comment:

This seems like an easy fix: just check that S_ISREG(st_mode) is true in
 new_buffersize in fileobject.c.

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[issue1167397] Python 2.4 causes BitTorrent 3.4.2 failure

[A.M. Kuchling]

A.M. Kuchling added the comment:

The Red Hat bug URL is now
https://bugzilla.redhat.com/show_bug.cgi?id=138535 ; it has a lengthy
discussion.

>From that bug's history, the problem now seems to be fixed, though I'm
not sure if it was fixed on the Python or the yum/BitTorrent side. 
Closing this bug, anyway.

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status: open -> closed

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[issue2145] ctypes.util.find_library(): posix .so without SONAME

[STINNER Victor]

New submission from STINNER Victor:

ctypes.util.find_library() fails to locate distorm64.so library 
because it has no SONAME entry:

$ objdump -p -j .dynamic /usr/local/lib/libdistorm64.so
/usr/local/lib/libdistorm64.so: file format elf32-i386
(...)
Dynamic Section:
  NEEDED  libc.so.6
  INIT0x12f4c
  FINI0x1bf84
  HASH0xb4
  (...)

Compare to libm.so:

$ objdump -p -j .dynamic /usr/lib/libm.so
/usr/lib/libm.so: file format elf32-i386
(...)
Dynamic Section:
  NEEDED  ld-linux.so.2
  NEEDED  libc.so.6
  SONAME  libm.so.6
  INIT0x335c
  (...)

I don't know why find_library() does use objdump to get SONAME.

Workaround to find_library() "bug": _get_soname() should return 
os.path.basename(f) instead of None. Is it correct?

Note: libdistorm64.so compilation is maybe broken (it's maybe not 
a "real" so library), but I'm able to use it with ctypes :-)

--
components: Library (Lib)
messages: 62580
nosy: haypo
severity: normal
status: open
title: ctypes.util.find_library(): posix .so without SONAME
type: rfe
versions: Python 2.5

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[issue2146] ctypes: support double for calling function

[STINNER Victor]

New submission from STINNER Victor:

ctypes doesn't support transparent conversion of double arguments. 
Example code:

from ctypes import cdll, c_double
libm = cdll.LoadLibrary("libm.so")
sqrt = libm.sqrt
sqrt.argstype = (c_double,)
sqrt.restype = c_double
print sqrt(4.0)

I wrote a patch to fix it: see attached patch

--
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files: ctypes_callproc_double.patch
messages: 62581
nosy: haypo
severity: normal
status: open
title: ctypes: support double for calling function
type: rfe
versions: Python 2.5
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[issue2145] ctypes.util.find_library(): posix .so without SONAME

[Martin v. Löwis]

Martin v. Löwis added the comment:

Thomas, can you take a look?

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[issue2144] os.environ should inherit dict

[Benjamin Peterson]

Benjamin Peterson added the comment:

Forgive me. I meant 290.

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[issue2146] ctypes: support double for calling function

[Martin v. Löwis]

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[issue2144] os.environ should inherit dict

[Martin v. Löwis]

Martin v. Löwis added the comment:

Sorry, it still makes no sense. Up to r56113, PEP 290 doesn't seem to
talk about UserDict, os.environ, or inheritance from new-style classes.
What section are you specifically referring to?

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[issue2144] os.environ should inherit dict

[Martin v. Löwis]

Martin v. Löwis added the comment:

I still must be missing something. There is no PEP 390, AFAICT.

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[issue2147] int operations no longer overflow

[Neal Norwitz]

New submission from Neal Norwitz:

Georg, I hope you don't mind me assigning this to you.  Feel free to
unassign.  A colleague pointed me to section 5.7 in the old ref doc:

http://docs.python.org/ref/shifting.html

It says that shifting operations lose data on overflow.  This info is
outdated based on PEP 237.  I suspect there may be other inaccuracies
related to int overflow.  So the purpose of this bug is to point out the
specific problem as well as to log that we need to find all invalid
references to overflow.

--
assignee: georg.brandl
components: Documentation
messages: 62586
nosy: georg.brandl, nnorwitz
severity: normal
status: open
title: int operations no longer overflow
versions: Python 2.5, Python 2.6, Python 3.0

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[issue2147] int operations no longer overflow

[Will Robinson]

Will Robinson added the comment:

Just jumping in to say the colleague Neal refers to is me, and I'm
interested in the resolution to this bug.  Thanks in advance for your help.

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