On Sat, 13 Jun 2015 13:48:45 +0100, Oscar Benjamin wrote:
> On 13 June 2015 at 08:17, Steven D'Aprano
> wrote:
>> But an easier way is:
>>
>> Test = [1, 2]
>> Test.extend(Test)
>> print(Test)
>
> I can't see anything in the docs that specify the behaviour that occurs
> here.
Neither do I, but
On 13 June 2015 at 08:17, Steven D'Aprano
wrote:
> On Sat, 13 Jun 2015 13:32:59 +0800, jimages wrote:
>
>> I am a newbie. I also have been confused when I read the tutorial. It
>> recommends make a copy before looping. Then I try.
>> #--
>> Test = [1, 2]
>> For i in Test:
>
On Sat, 13 Jun 2015 13:32:59 +0800, jimages wrote:
> I am a newbie. I also have been confused when I read the tutorial. It
> recommends make a copy before looping. Then I try.
> #--
> Test = [1, 2]
> For i in Test:
> Test.append(i)
> #--
You don
> On Jun 12, 2015, at 11:00 PM, Fabien wrote:
> but that awful bug made me wonder: is it a bad practice to interactively
> modify the list you are iterating over?
Yes.
I am a newbie. I also have been confused when I read the tutorial. It
recommends make a copy before looping. Then I try.
#
On Friday, June 12, 2015 at 5:27:21 PM UTC-7, Chris Angelico wrote:
> On Sat, Jun 13, 2015 at 10:02 AM, wrote:
> >> >>> ints = [0, 1, 2, 2, 1, 4, 6, 5, 5]
> >> >>> ints[:] = [i for i in ints if not i % 2]
> >> >>> ints
> >> [0, 2, 2, 4, 6]
> >>
> >>
> >> --
> >> Terry Jan Reedy
> >
> > On the
On Sat, Jun 13, 2015 at 10:02 AM, wrote:
>> >>> ints = [0, 1, 2, 2, 1, 4, 6, 5, 5]
>> >>> ints[:] = [i for i in ints if not i % 2]
>> >>> ints
>> [0, 2, 2, 4, 6]
>>
>>
>> --
>> Terry Jan Reedy
>
> On the second line of your final solution, is there any reason you're using
> `ints[:]` rather t
On Friday, June 12, 2015 at 4:44:08 PM UTC-7, Terry Reedy wrote:
> On 6/12/2015 4:34 PM, Laura Creighton wrote:
> > The real problem is removing things from lists when you are iterating
> > over them, not adding things to the end of lists.
>
> One needs to iterate backwards.
>
> >>> ints = [0, 1
On 6/12/2015 4:34 PM, Laura Creighton wrote:
The real problem is removing things from lists when you are iterating
over them, not adding things to the end of lists.
One needs to iterate backwards.
>>> ints = [0, 1, 2, 2, 1, 4, 6, 5, 5]
>>> for i in range(len(ints)-1, -1, -1):
if ints[
On 6/12/2015 11:00 AM, Fabien wrote:
is it a bad practice
to interactively modify the list you are iterating over?
One needs care. Appending to the end of the list is OK, unless you
append a billion items or so ;-) Appending to the end of a queue while
*removing* items from the front of the
The real problem is removing things from lists when you are iterating
over them, not adding things to the end of lists.
Python 2.7.9 (default, Mar 1 2015, 12:57:24)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> mylist = [1,2,3]
>>> for i in mylis
On 12/06/2015 16:00, Fabien wrote:
Folks,
I am developing a program which I'd like to be python 2 and 3
compatible. I am still relatively new to python and I use primarily py3
for development. Every once in a while I use a py2 interpreter to see if
my tests pass through.
I just spent several ho
On 06/12/2015 05:26 PM, Ian Kelly wrote:
but that awful bug made me wonder: is it a bad practice to
>interactively modify the list you are iterating over?
Generally speaking, yes, it's bad practice to add or remove items
because this may result in items being visited more than once or not
at all
On 06/12/2015 05:26 PM, Ian Kelly wrote:
for stuff, branch in zip(stuffs, branches):
> # compute flux
> ...
> # add to the downstream branch
> id_branch = branches.index(branch.flows_to)
> branches[id_branch].property.append(stuff_i_computed)
Er, I don't s
On Fri, Jun 12, 2015 at 9:00 AM, Fabien wrote:
> Folks,
>
> I am developing a program which I'd like to be python 2 and 3 compatible. I
> am still relatively new to python and I use primarily py3 for development.
> Every once in a while I use a py2 interpreter to see if my tests pass
> through.
>
On 06/12/2015 05:00 PM, Fabien wrote:
I've found the izip() function which should do what I want
I've just come accross a stackoverflow post where they recommend:
from future_builtins import zip
which is OK since I don't want to support versions <= 2.6
--
https://mail.python.org/mailman/listi
Folks,
I am developing a program which I'd like to be python 2 and 3
compatible. I am still relatively new to python and I use primarily py3
for development. Every once in a while I use a py2 interpreter to see if
my tests pass through.
I just spent several hours tracking down a bug which wa
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