[Python-ideas] suggestion about the sort() function of the list instance

[Stéfane Fermigier]

Cf. https://martinfowler.com/bliki/CommandQuerySeparation.html

But:

>>> l = [1,2,3]
>>> l.pop()
3
>>> l
[1, 2]

=> Not so true.

  S.

On Wed, Mar 1, 2017 at 11:10 AM, Stephan Houben <stephanh42 at gmail.com>
wrote:

> It's even in the Programming FAQ:
>
> "In general in Python (and in all cases in the standard library) a method
> that mutates an object will return None to help avoid getting the two
> types of operations confused. So if you mistakenly write y.sort() thinking
> it will give you a sorted copy of y, you’ll instead end up with None,
> which will likely cause your program to generate an easily diagnosed error."
>
> Stephan
>
> 2017-03-01 10:31 GMT+01:00 Paul Moore <p.f.moore at gmail.com>:
>
>> On 1 March 2017 at 01:31, qhlonline <qhlonline at 163.com> wrote:
>> > My code example is not proper,  Yes,  may be this is better:
>> > list.sort().revers(
>>
>> We can already do this - reversed(sorted(lst))
>>
>> This is a long-established design decision in Python. It would need a
>> *very* compelling use case to even think about changing it.
>> Paul
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