tion isn't called "word-tokenize". That would
mean "word subtract tokenize" in Python code. Do you mean word_tokenize?
Have you compared the output of the two and looked at how they differ? If
there is too much output to compare by eye, you could convert to sets and
ch
es where the code is improved and made
more expressive by using operator syntax and existing operators aren't
sufficient.
(If there aren't any such use-cases, then there's no need for custom
operators.)
Thoughts?
--
Steven D'Aprano
"Ever since I learned ab
>> global.
>
> When something goes wrong in an unexpected way: test your assumptions
> ;-)
xuanwu348's assumptions are correct. aLock is a global, in both
positions. The problem is not the scope of the variable, but whether or
not the variable is assigned to or not.
--
(Events)
508
Unless that's what you intended, you ought to move the class outside of
the function.
class Events(ctypes.Structure):
_fields_ = [ ... ]
def mkVstEvents(events):
return Events( ... )
--
Steven D'Aprano
"Ever since I learned about confirmati
seems like an interesting experiment... put time.sleep(0.3) at the
end of the event handler and see what happens.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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m/a/12357536
but since the description of the problem is so vague, it is hard to tell
exactly what's happening.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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o locals works inside the class body.
locals()[name] = inner
del inner, name # Clean up the class namespace.
def concrete_method_a(self):
...
although to be honest I'm not sure if that would be enough to stop PyLint
from complaining.
--
Steven D'Aprano
"
On Tue, 14 Aug 2018 15:18:13 +, Jon Ribbens wrote:
> On 2018-08-14, Steven D'Aprano
> wrote:
>> If there really are a lot of such missing methods, I'd consider writing
>> something like this:
>>
>> class A:
>> def __init__(self, ...):
&
starting with:
[]
[]
[8, 9]
[]
[14, 15]
etc. Take care though: I have not tested this code.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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so in practice, I probably wouldn't switch to a factory
solution for merely four methods with empty bodies. But I certainly would
for eight.
When making this trade-off, "my developers don't understand Python's
execution model or its dynamic features" is not a good reason to stick to
large amounts of mindless code. That's a good reason to send the
developer in question to a good Python course to update their skills.
(Of course if you can't do this for political or budget reasons, I
sympathise.)
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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using a separate method per subclass does exactly what I
> want, and that part of my project has been working stably for some time.
You might consider using single dispatch instead:
https://docs.python.org/3/library/functools.html#functools.singledispatch
--
Steven D'Aprano
"Ever
On Fri, 17 Aug 2018 11:49:01 +, Jon Ribbens wrote:
> On 2018-08-17, Steven D'Aprano
> wrote:
>> On the other hand, your objection to the following three idioms is as
>> good an example of the Blurb Paradox as I've ever seen.
>
> Do you mean the Blub Parad
tates the intention "These methods are identical except
in their name" more strongly than creating them in a loop?
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
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that means no decorators, no closures, no
introspection ("reflection" in Java terms), no metaclasses (other than
type), no use of descriptors (other than the built-in ones), no template-
based programming, no source-code generators. No namedtuples, Enums, or
data-classes.
--
Stev
In practice I
wouldn't even consider this for three methods. Six or eight seems like a
reasonable cut-of point for me, but it depends on the specifics of the
code and who I was writing it for.
(Note that this makes me much more conservative than the usual advice
given by system admins, when
h, the penny drops* ...
Are you trying to generate the keys by using nested loops?
for i in range(1000): # up to some maximum value
for j in range(1000):
for k in range(1000):
for l in range(1000):
key = "FEq_({0},_{1},_{2},_{3})".format(i,j,k,l)
On Sun, 19 Aug 2018 11:43:44 +0300, Marko Rauhamaa wrote:
> Steven D'Aprano :
>
>> On Sun, 19 Aug 2018 00:11:30 +0300, Marko Rauhamaa wrote:
>>
>>> In Python programming, I mostly run into closures through inner
>>> classes (as in Java).
>>
>>
Feq_(i,_j,_k,_l)'] = temp
If you want to leave the original in place and do something else with the
result:
result = varsdict['Feq_(i,_j,_k,_l)'] * A[i,j,k,l]
print(result)
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it
On Sun, 19 Aug 2018 03:35:24 -0700, giannis.dafnomilis wrote:
> On Sunday, August 19, 2018 at 3:53:39 AM UTC+2, Steven D'Aprano wrote:
[...]
>> If you know absolutely for sure that the key format is ALWAYS going to
>> be 'FEq_()' then you can extract the fiel
| hexdump
000 84fd 0804 000a
005
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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9, 'FEq_(0,_0,_3,_0)': }
If you run
print(varsdict)
what does it show?
(I have limited time to respond at the moment, so apologies for the brief
answers. Hopefully someone else will step in with some help too.)
--
Steven D'Aprano
"Ever since I learned about
On Mon, 20 Aug 2018 00:31:35 +, Steven D'Aprano wrote:
> When I write bytes to stdout, why are they reversed?
Answer: they aren't, use hexdump -C.
Thanks to all replies!
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
i
> statement, which is clearly worse than executing a def statement (0.1
> µs) or integer addition (0.05 µs). However, 7 microseconds is the least
> of my programming concerns.
And fair enough... premature optimization and all that.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
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ers in this way :-(
(Not that I do this using "inner classes", but I do often want to use a
class as a container for functions, without caring about "self" or
wrapping everything in staticmethod.)
--
Steven D'Aprano
"Ever since I learned about confirmation bias,
On Mon, 20 Aug 2018 14:46:32 +0400, NAB NAJEEB wrote:
> Hi am a beginner can u tell me where can I write my codes I already
> tried pycharm and atom.. both are not worked successfully always shows
> error...pls guide me...
What errors do they show?
--
Steven D'Aprano
"E
On Mon, 20 Aug 2018 22:55:26 +0300, Marko Rauhamaa wrote:
> Dan Sommers :
>
>> On Mon, 20 Aug 2018 14:39:38 +, Steven D'Aprano wrote:
>>> I have often wished Python had proper namespaces, so I didn't have to
>>> abuse classes as containers in this wa
asses and instances come with inheritance, self etc which is great if
you want a class, but if you just want a simple module-like namespace
without the extra file, classes are a pretty poor alternative. But
they're all we've got.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
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library/itertools.html
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
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oids closures altogether but we don't know the full requirements here
and its hard to judge from the outside on why Marko picked the design he
has and whether its a good idea. It could be a case of "ooh, closures are
a shiny new hammer, this problem must be a nail!" but let's give him the
benefit of the doubt and assume he has good reasons, not just reasons.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
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tarted? (I am an amateur)
That's more a maths question than a programming question. Find out how to
tackle it mathematically, and then we can code it.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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if you want a guard digit), a rounding mode (Banker's
Rounding is recommended for financial applications), and just do your
calculations with no "clever tricks".
Add two numbers, then add tax:
money = (a+b)*(1+t/100)
compared to the "clever trick":
money =
nction:
Or better still, DON'T manually use the round function, let the
interpreter do the rounding for you by using Decimal. That's what its for.
Why in the name of all that's holy would anyone want to manually round
each and every intermediate calculation when they could use the
On Thu, 30 Aug 2018 19:22:29 +1200, Gregory Ewing wrote:
> Steven D'Aprano wrote:
>> Why in the name of all that's holy would anyone want to manually round
>> each and every intermediate calculation when they could use the Decimal
>> module and have it do it a
calls your scripts.
There are many choices: tkinter is provided in the Python standard
library, but some people prefer wxPython, PyQT4, or other GUI toolkits.
https://duckduckgo.com/?q=python+gui+toolkits
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I'
to
make this a hard rule?
Did anyone mention what the standard library does?
Check out the dbm, logging, html, http, collections, importlib, and
curses packages (and probably others):
https://github.com/python/cpython/tree/3.7/Lib
--
Steven D'Aprano
"Ever since I learned
On Fri, 31 Aug 2018 18:45:16 +1200, Gregory Ewing wrote:
> Steven D'Aprano wrote:
>> The right way is to
>> set the rounding mode at the start of your application, and then let
>> the Decimal type round each calculation that needs rounding.
>
> It's not
;>>
>>>>
> The first two format methods behave as expected. The old-style '%'
> operator does not.
The % operator casts the argument to a (binary) float. The other two
don't need to, because they call Decimal's own format method.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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rn 2*r+1
but I don't understand the let ... in part so I'm not sure if I'm doing
it right.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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*r+1
but I don't understand the let ... in part so I'm not sure if I'm doing it
right.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing it everywhere."
-- Jon Ronson
--
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n you need it, not to hold on to the reference for
later.
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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27;m speaking up now because your reply to Reto is unwelcoming, unhelpful
and disrespectful, and coming from a moderator who has been known to ban
people, that makes it even more hostile.
[1] Yes, there are such things as stupid questions. If your doctor asked
you "remind me again, whic
;t use a "bare" except, i.e. one that doesn't
> specify what exception(s) it should catch.
Excellent advice!
More here:
https://realpython.com/the-most-diabolical-python-antipattern/
--
Steven D'Aprano
"Ever since I learned about confirmation bias, I've
On Thu, 06 Sep 2018 13:48:54 +0300, Marko Rauhamaa wrote:
> Chris Angelico :
>> The request was to translate this into Python, not to slavishly imitate
>> every possible semantic difference even if it won't actually affect
>> behaviour.
>
> I trust Steven to b
e on the day. That will
often be the "get" method.
But on the rare occasions I do care about performance, the basic rule of
thumb I use is that if the key is likely to be missing more than about
10% of the time, I use the "LBYL" idiom (either an explicit test using
"if key
s not ridicule.)
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Steven D'Aprano
"Ever since I learned about confirmation bias, I've been seeing
it everywhere." -- Jon Ronson
--
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On Fri, 07 Sep 2018 15:10:10 +0100, Paul Moore wrote:
> On Fri, 7 Sep 2018 at 14:06, Steven D'Aprano
> wrote:
[...]
>> However I have a follow up question. Why the "let" construct in the
>> first place? Is this just a matter of principle, "put everyth
_bootstrap_inner
self.run()
File "/usr/local/lib/python3.5/threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File "", line 5, in worker
AttributeError: '_thread._local' object has no attribute 'value'
What am I doing w
ime, I may not reply on-list to any responses.
Subject: Fwd: Temporary Suspension
To:
From: Ethan Furman
Date: Tue, 11 Sep 2018 11:22:40 -0700
In-Reply-To:
Steven, you've probably already seen this on Python List, but I forgot
to email it directly to you. My apologies.
--
~Ethan~
Python Lis
tion.
"Classless object" is an oxymoron in Python since all values without
exception have a class. Can you explain what you mean?
Also, for the benefit of those who aren't Java coders, what do you mean
by "Java's syntactic innovation"?
>>> And I always curs
back to Alonzo Church, who in the 1930's started with
a "hat" symbol; he wrote the square function as "ŷ . y × y". But frustrated
typographers moved the hat to the left of the parameter and changed it to a
capital lambda: "Λy . y × y"; from there the capital l
http://lukeplant.me.uk/blog/posts/why-learning-haskell-python-makes-you-a-worse-programmer/
--
Steven
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On Monday 28 March 2016 23:18, BartC wrote:
> On 28/03/2016 02:24, Steven D'Aprano wrote:
>> Don't think about floats and ints and strings. Think of complex objects
>> with operator overloading. You're probably thinking of `x + y`. Instead,
>> think of things
On Monday 28 March 2016 12:40, Paul Rubin wrote:
> Steven D'Aprano writes:
>> if condition:
>> print(1)
>> print(2)
>> else:
>> print(3)
>> print(4)
>> what value should it return? Justify your choice.
>
> It could wha
On Tue, 29 Mar 2016 09:26 pm, Sven R. Kunze wrote:
> On 27.03.2016 05:01, Steven D'Aprano wrote:
>> Am I the only one who has noticed that threading of posts here is
>> severely broken? It's always been the case that there have been a few
>> posts here and there t
On Tue, 29 Mar 2016 10:31 pm, BartC wrote:
> On 29/03/2016 09:26, Steven D'Aprano wrote:
>> On Monday 28 March 2016 12:40, Paul Rubin wrote:
>
>
>> The point is that there's nothing intrinsically obvious or right about
>> "return the value of the las
ou calculate the total:
sum(prices)
--
Steven
--
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iki/Bijection,_injection_and_surjection
If somebody wants to insist that this is a kind of mapping, I can't
disagree, but it isn't useful as a mapping type.
--
Steven
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On Wednesday 30 March 2016 16:43, Steven D'Aprano wrote:
> This is not an argument about dicts being mutable, because clearly they
> aren't.
Er, I meant *immutable*. Dicts aren't immutable.
--
Steve
--
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On Wed, 30 Mar 2016 06:12 pm, Jussi Piitulainen wrote:
> Steven D'Aprano writes:
>
>> Given a surjection (many-to-one mapping)
>
> No. And I doubt that Wikipedia says that.
No to what? What are you disagreeing with?
--
Steven
--
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On Wed, 30 Mar 2016 09:28 pm, Jussi Piitulainen wrote:
> Steven D'Aprano writes:
>
>> On Wed, 30 Mar 2016 06:12 pm, Jussi Piitulainen wrote:
>>
>>> Steven D'Aprano writes:
>>>
>>>> Given a surjection (many-to-one mapping)
>>>
&
and contrived examples such as this do not count:
class MyDict(dict):
def values(self):
for value in super().values():
yield value
yield object() # It's a value without a key!
--
Steven
--
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;)
>
> print(f(3))
This code seems to work perfectly to me. You differentiate an expression,
then substitute the 'x' variable for 't':
-2*t/(t**2 + 1)**2
What were you expecting?
--
Steven
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ained what you *actually* wanted, because I was going to
guess that you wanted to evaluate the derivative at x = 3:
py> ftext.evalf(subs={x:3})
-0.06000000
--
Steven
--
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On Thu, 31 Mar 2016 12:12 am, Antoon Pardon wrote:
> Op 30-03-16 om 14:22 schreef Steven D'Aprano:
[...]
>> Why is a mapping (such as a dict) best described as a surjection?
>> Consider:
>>
>> d = {1: None, 2: 'a', 3: 'b', 4: None}
>>
gt;
> Javascript seems to manage it just fine.
I wouldn't exactly hold Javascript up as the exemplar of intelligent design
decisions.
--
Steven
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assert mapping["george"] != "27 Main Road"
No hypothetical cases where somebody might or could want this behaviour. I'm
not interested in "mights" and "coulds". I want to see an actual
application where adding a new key to a mapping is expected to change the
other keys.
--
Steven
--
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ollections.abc.Mapping):
it = obj.items
elif isinstance(obj, collections.abc.Sequence):
it = enum(obj)
else:
raise TypeError('not a sequence or a mapping')
yield from it
Pick which one you prefer, stick it in your own personal toolbox of useful
utili
On Thursday 31 March 2016 15:50, Mark Sapiro wrote:
> Hi all,
>
> I'm jumping in on this thread because Tim asked.
[...]
Thanks for the explanation!
--
Steve
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On Thursday 31 March 2016 13:45, Paul Rubin wrote:
> Steven D'Aprano writes:
>> I want to see an actual application where adding a new key to a
.^
>> mapping is expected to change the other keys.
> directory["mary.roommate"]
d dicts.
So, Antoon, no, I don't have to justify a single thing. If you want this
change, you have to justify why it should be done.
Good luck with that.
--
Steven
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that, you'll soon find out
whether Python itself is working.
--
Steven
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[]
To get a default:
py> L[5:6] or -1
-1
This is short and simple enough to use in place, but we can also wrap this
into a convenient helper function:
def get(seq, index, default=None):
return (seq[index:index+1] or [default])[0]
py> get(L, 2, -1)
8
py> get(L, 200, -1)
-1
--
Steven
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pedia.org/wiki/Swatch_Internet_Time
--
Steven
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ave to post it to imgur or similar, and secondly, a screen-shot is
of no use to anyone using a screen reader.
--
Steven
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the 1988 C standard."
A: "Surely you aren't serious?"
But most people don't bother passing ideas through here first, they just go
straight to Python-Ideas.
--
Steven
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except with more error checking, better bounds checking, support for the
`in` operator, etc.
--
Steven
--
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ey):
del mylist[i]
mylist.insert(0, x)
or if you prefer:
for i, x in enumerate(mylist):
if x.startswith(key):
mylist[:] = [x] + mylist[:i] + mylist[i+1:]
--
Steven
--
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s is analogous
> with the difference between C's arrays and pointers.)
I don't understand this analogy. Can you explain please?
--
Steven
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pupel.plaese(pupel.resolts)
Google translate suggests Marko's code means:
for pupil in class:
if pupil.abandoned():
pupil.please(pupil.results)
--
Steven
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On Sun, 3 Apr 2016 03:12 am, Thomas 'PointedEars' Lahn wrote:
> Marko Rauhamaa wrote:
>
>> Steven D'Aprano :
>>> So you're saying that learning to be a fluent speaker of English is a
>>> pre-requisite of being a programmer?
>>
>> N
hurts reaction time. I ask people a
question, and they don't reply for a week or at all, because they're too
busy playing games all day.
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Steven
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h points to another thing":
- C pointers (memory addresses);
- some form of managed reference to a memory location;
- classic Mac OS "handles" (managed pointers-to-pointers);
- or even integer indexes into a giant array, like early
versions of Fortran.
But that hardly means that pointers are a feature of the Java language.
> This holds no matter what
> kind of object is passed in or what mutable properties it has or does
> not have.
I'm still not getting your point.
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only with Popen.
What makes you think that Popen objects have a split() method? They are not
documented as having this method:
https://docs.python.org/2/library/subprocess.html
https://docs.python.org/3/library/subprocess.html
https://pymotw.com/2/subprocess/
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Steven
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ethod was removed in 2002.)
Discussion and feature request in 2007: "We really ought to fix that slow
performance of (x)range membership testing..."
http://bugs.python.org/issue1766304
So it's one of those things on the border of useful or not. Those who use
it, miss it when its gon
On Sun, 3 Apr 2016 02:43 pm, Steven D'Aprano wrote:
> If you personally don't see any advantage in this, so be it, but you might
> not be aware of the history of (x)range:
>
> Guido in 2001: "..."
Correction: these are not direct quotes, but paraphrases
ctet" is a slightly more precise term than
> "byte", meaning exactly 8 bits (whereas "byte" could
> theoretically mean something else depending on the
> context).
"Theoretically"?
http://stackoverflow.com/questions/2098149/what-platforms-have-something-other
; inside that same
directory;
- execute that file "tkinter/ttk.py" (for example" to create a
module object;
- create a local variable "ttk" bound to that module object.
So you can see why this doesn't work:
import tkinter as tk
import tk.ttk as ttk
is looki
are deleted.
Please copy and paste the text of the error, if you can. Otherwise, if it is
short, please retype it into your message. If it is too long to retype, you
can upload your screen shot to Imgur and then link to that.
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Steven
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I’m getting “IDLE's subprocess didn't make connection. Either IDLE can't start
or personal firewall software is blocking connection.”. Any ideas?
Sent from Mail for Windows 10
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
--
https://m
anyway in order to
> really explicit about what the public API is. """
Does his team not do internal code reviews? I hate code that lies about
where it comes from. I certainly wouldn't do it in a futile attempt to
protect idiots from themselves.
> Curious what folks on this list recommend, or if there are best practices
> about this published somewhere.
>
> Thanks,
> Josh
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lines of code, to do your work for you? For free?
We try to be friendly and helpful, but there are limits. Please read this
before replying:
http://www.sscce.org/
Thank you.
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Steven
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How are you running it?
- type "python" into a command shell?
- double-click an icon on the desktop?
- choose "Python" from the Start menu?
- something else?
The more detail you can give, the better the chances we can help you. If you
give no detail, we can give no help.
--
Steven
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On Tuesday 05 April 2016 14:27, Rustom Mody wrote:
> On Tuesday, April 5, 2016 at 9:53:30 AM UTC+5:30, Chris Angelico wrote:
>> On Tue, Apr 5, 2016 at 2:08 PM, Rustom Mody wrote:
>> >> 'import tk.ttk' looks for 'tk' in sys.modules, does not find it, looks
>> >> for a module named 'tk' on disk, do
S.
Bad question, with no useful answers:
Question: "It doesn't work! What am I doing wrong"
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GraphicsWindow
> ImportError: cannot import name 'GraphicsWindow'
How did you install it? Are you sure it is the right module?
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on Windows.
>
> +10 on that one
> ie When a question becomes a FAQ just put it there
Would somebody who knows Windows actually do this and then post the link
here please?
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On Wed, 6 Apr 2016 03:38 am, Sven R. Kunze wrote:
> On 05.04.2016 03:43, Steven D'Aprano wrote:
>> The purpose of packages isn't enable Java-style "one class per file"
>> coding, especially since *everything* in the package except the top level
>> "b
file. And
> that should do it. :)
None of which ought to be part of the package itself. Well, perhaps the
README.
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9d
formats an integer in nine columns, justified on the left, while %9d
justifies to the right:
py> print("%-9d." % 23)
23 .
py> print("%9d." % 23)
23.
Finally, the line is printed so you can see what it looks like, and written
to the file.
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faqs/smart-questions.html>
Why oh why can't somebody write "How to write smart answers" for people
like "Pointed Ears"?
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