Grant Edwards invalid@invalid.invalid:
Anyway, I would say Python definitely is in the classic pass-by-value
camp. Here's a simple test:
def f(x):
x = 3
y = 1
f(y)
print(y)
If it prints 1, it's pass by value. If it prints 3, it's pass by
reference.
Somebody else
Hi Laura,
Thanks a Lot for the reply.
I wanted to know if calling a Python script from SAP HANA database is
possible.
Thanks!
On Jun 3, 2015 9:43 PM, Laura Creighton l...@openend.se wrote:
In a message of Wed, 03 Jun 2015 15:17:16 +0530, Amit Goutham writes:
Hi All,
I am trying to search on
On 06/03/2015 04:28 PM, sohcahto...@gmail.com wrote:
People actually argue that Python passes by value? This is easily
proven wrong by passing a mutable object to a function and changing
it within the function.
Sure but if you reassign the variable that was passed it, it has no
effect
Steven D'Aprano st...@pearwood.info:
But you still find a few people here and there who have been exposed
to Java foolishness, and will argue that Python is pass by value,
where the value is an implementation dependent reference to the thing
that you thought was the value.
Why fight
Raymond Hettinger added the comment:
FWIW, I like this idea.
--
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Changes by Arfrever Frehtes Taifersar Arahesis arfrever@gmail.com:
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On 03.06.15 02:56, Chris Angelico wrote:
On Wed, Jun 3, 2015 at 7:27 AM, fl rxjw...@gmail.com wrote:
I just see the tutorial says Python can return value in function, it does
not say multiple data results return situation. In C, it is possible.
How about Python on a multiple data return
On 06/03/2015 01:41 PM, Mohan Mohta wrote:
Hello
I am trying to create multiple thread through the below program but I am
getting an error
#! /usr/bin/python
import os
import subprocess
import thread
import threading
from thread import start_new_thread
def proc(f) :
com1=ssh -B
Martin Panter added the comment:
Hi Michiel, if you are looking for the source of
https://docs.python.org/dev/c-api/veryhigh.html#c.PyOS_InputHook, that
corresponds to Doc/c-api/veryhigh.rst in the repository.
This bug would be fairly easy to solve for “tkinter” if we could drop the
On 06/04/2015 04:08 AM, c.bu...@posteo.jp wrote:
On Ubuntu when ...
... I used setup.py bdist_rpm and alien to create a deb.
You got it the hard way :-)
Why wont you try another way?
Here are some links from my bookmarks:
I am not sure where I am or where to go. ;)
So before asking about technical details I first want to know if it is
generally possible.
On Ubuntu when I install python-based applications (from a repository)
as deb-packages I can start them by just typing its name because the
py-file or a link to
Serhiy Storchaka added the comment:
Why not index the slice type itself? slice[1:2]
Another feature of the new `literal` object is that it is not limited to just
the creation of `slice` instances; instead, it is designed to mix slices and
other types together.
This looks as disadvantage.
I'm going to x-post this to stackoverflow but...
When checking a method's arguments to see whether they were set, is it
pythonic to do an identity check:
def doThis(arg1, arg2=None):
if arg2 is None:
arg2 = myClass()
Or is it proper form to use a short-circuiting boolean:
def
proc(f) isn't a callable, it's whatever it returns. IIRC, you need to do
something like 'start_new_thread(proc, (f,))'
--
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Russell Brennan russelljbren...@gmail.com writes:
I'm going to x-post this to stackoverflow but...
When checking a method's arguments to see whether they were set, is it
pythonic to do an identity check:
def doThis(arg1, arg2=None):
if arg2 is None:
arg2 = myClass()
That is the
Frank Millman wrote:
I have a slight variation in that I want to keep a reference to the
argument -
def __init__(self, arg=None):
self.arg = arg or []
Based on your comment, I have changed it to -
def __init__(self, arg=None):
self.arg = [] if arg is None else arg
Does
In a message of Thu, 04 Jun 2015 00:04:04 +0100, BartC writes:
Mainly the language itself. But I've also been looking at the workings
of CPython. (Also PyPy but obviously I'm not going to get anywhere
there, although RPython sounds intriguing.)
Why not? We built the thing for people like you
In a message of Wed, 03 Jun 2015 20:59:04 +0200, Laura Creighton writes:
Tkinter runs on raspberry pi.
Get it installed, and then run this program.
from Tkinter import *
root = Tk()
prompt = 'Press any key. Remember to keep your mouse in the cyan box. '
lab = Label(root, text=prompt,
On 06/04/2015 09:12 AM, Cecil Westerhof wrote:
Can't IPython just call the find and du utilities?
That is what
!find ~ -iname '*python*.pdf'
does. But I do not find that aesthetically.
Like I said, I find ipython to be hackish, but invoking find this way is
no more hackish than writing
On 04/06/2015 19:34, Ian Kelly wrote:
On Wed, Jun 3, 2015 at 3:56 PM, Mark Lawrence breamore...@yahoo.co.uk wrote:
Now does Python pass by value or by reference? Happily sits back and waits
for 10**6 emails to arrive as this is discussed for the 10**6th time.
Troll.
True indeed.
As
Yury Selivanov added the comment:
Alternative patch with monkeypatching instead of Future subclassing.
--
Added file: http://bugs.python.org/file39623/concurrent_alt.patch
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Guido van Rossum added the comment:
Sorry, I don't like that either. See my review.
--
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Changes by Yury Selivanov yseliva...@gmail.com:
Added file: http://bugs.python.org/file39624/concurrent.patch
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On 2015-06-04 13:09, Michael Torrie wrote:
Why not use Python for what it's good for and say pipe the results
of find into your python script? Reinventing find poorly isn't
going to buy you anything.
Until you port your app to Windows where find(1) is unavailable
natively ;-)
-tkc
--
On 06/02/2015 10:13 AM, Cecil Westerhof wrote:
I am thinking about using ipython3 instead of bash. When I want to
find a file I can do the following:
!find ~ -iname '*python*.pdf'
but is there a python way?
No more than there is a bash-native way of doing find. Bash scripts use
a myriad
Peter Otten __pete...@web.de wrote in message
news:mkp10p$n0l$1...@ger.gmane.org...
Russell Brennan wrote:
I'm going to x-post this to stackoverflow but...
When checking a method's arguments to see whether they were set, is it
pythonic to do an identity check:
def doThis(arg1,
Nick Coghlan added the comment:
Would it also be worth making at docs update to tp_dealloc, suggesting the use
of tp_traverse/finalize?:
https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_dealloc
And perhaps from PyType_FromSpec?
Nick Coghlan added the comment:
Ah, I'd missed that the previous code wouldn't clean up properly in the failure
case.
+1 for inlining the check and using the existing error label.
--
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Petr Viktorin added the comment:
tp_traverse is completely orthogonal to tp_dealloc, it's needed to detect (and
then break) reference cycles like:
obj = xxlimited.Xxo()
obj.foo = obj
As for tp_finalize: yes, mentioning it in tp_dealloc docs would be good, but
I'll need a bit more
Russell Brennan wrote:
I'm going to x-post this to stackoverflow but...
When checking a method's arguments to see whether they were set, is it
pythonic to do an identity check:
def doThis(arg1, arg2=None):
if arg2 is None:
arg2 = myClass()
Or is it proper form to use a
Roundup Robot added the comment:
New changeset 265eeb60443a by Nick Coghlan in branch '3.5':
Issue #24373: Eliminate PEP 489 test refleaks
https://hg.python.org/cpython/rev/265eeb60443a
New changeset f24cd8bc5250 by Nick Coghlan in branch 'default':
Merge fix for issue #24373 from 3.5
Roundup Robot added the comment:
New changeset 265eeb60443a by Nick Coghlan in branch '3.5':
Issue #24373: Eliminate PEP 489 test refleaks
https://hg.python.org/cpython/rev/265eeb60443a
--
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___
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On 04/06/2015 11:06, Laura Creighton wrote:
In a message of Thu, 04 Jun 2015 00:04:04 +0100, BartC writes:
Mainly the language itself. But I've also been looking at the workings
of CPython. (Also PyPy but obviously I'm not going to get anywhere
there, although RPython sounds intriguing.)
Why
Martin Panter added the comment:
I guess this would involve:
* Making a new API called Py_Finalize2() or something that returns the status
* Redefine the existing Py_Finalize() to call Py_Finalize2() and ignore the
return value
--
___
Python
Hi guys,
I know there are many modules(builtin or not, e.g.
beautifulsoup,xml,lxml,htmlparser .etc) to parse html files and output the DOM
tree. However, if there is any better way to get the DOM tree without using
those html/xml related modules? I mean, just by some general standard modules,
floyd added the comment:
Now that I gave it another thought, I think it would be better if we simply add
threshold as a named parameter of quick_ratio
--
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Guido van Rossum added the comment:
Thinking about this more I think we should pass on this for now.
--
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New submission from floyd:
I guess a lot of users of difflib call the SequenceMatcher in the following way
(where a and b often have different lengths):
if difflib.SequenceMatcher.quick_ratio(None, a, b) = threshold:
However, for this use case the current quick_ratio is quite a performance
Antoine Pitrou added the comment:
We would probably call it Py_FinalizeEx(), but yes.
--
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Changes by Nick Coghlan ncogh...@gmail.com:
--
resolution: - fixed
stage: - resolved
status: open - closed
type: - behavior
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Elementtree is part of the Python standard library. You are better off
using it than rolling your own. (If you were one of the rare people who
have some very strange requirements that make you better off writing your
own, you wouldn't be asking us. You'd already know.)
Yury Selivanov added the comment:
Hmm, but IMHO a) the new syntax isn't just for asyncio and b) awaiting a
Future seems like a *very* reasonable thing to do. I think opening a new
ticket for this is a good idea.
Stefan, I honestly have bo idea what concurrent.Future.__await__ would do.
Mark Dickinson added the comment:
For prior art, it's worth taking a look at NumPy, and in particular its `s_`
and `index_exp` functions:
import numpy as np
np.s_[1:2]
slice(1, 2, None)
np.s_[0]
0
np.s_[1:2, 3]
(slice(1, 2, None), 3)
--
nosy: +mark.dickinson
Joe Jevnik added the comment:
Why not index the slice type itself? slice[1:2]
I originally considered this and I personally really like this syntax, but I
was concerned with ambiguity with the typing module
The only question in my mind is what slice should do when given just a single
On Thu, 4 Jun 2015 07:08 am, Rustom Mody wrote:
So it means that indices can give indexerror; slices cannot?
If you write your own class with a __getitem__ method, you can have it do
anything you like, including raise an exception.
Built-in sequence types like list, str and tuple, however,
Hi All,
This is the case. To split string2 from string1_string2 I am using
re.split('_', string1_string2, 1)[1].
It is working fine for string string1_string2 and output as string2. But
actually the problem is that if a sting is __string1_string2 and the output
is _string1_string2. It is
In a message of Thu, 04 Jun 2015 13:01:00 +0100, BartC writes:
On 04/06/2015 11:06, Laura Creighton wrote:
In a message of Thu, 04 Jun 2015 00:04:04 +0100, BartC writes:
Mainly the language itself. But I've also been looking at the workings
of CPython. (Also PyPy but obviously I'm not going to
mu-repo 1.1.1 now provides a workflow which allows cloning multiple
repositories.
See: http://fabioz.github.io/mu-repo/cloning/ for more details
Also, now that there's actually a homepage, I believe even long time users
may benefit from taking a look at the Tips Tricks page:
On Thu, 4 Jun 2015 11:18 am, Russell Brennan wrote:
I'm going to x-post this to stackoverflow but...
When checking a method's arguments to see whether they were set, is it
pythonic to do an identity check:
def doThis(arg1, arg2=None):
if arg2 is None:
arg2 = myClass()
Or is
On Thu, Jun 4, 2015 at 9:36 AM, Palpandi palpandi...@gmail.com wrote:
Hi All,
This is the case. To split string2 from string1_string2 I am using
re.split('_', string1_string2, 1)[1].
It is working fine for string string1_string2 and output as string2. But
actually the problem is that if a
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