[Python-Dev] PEP 8 modernisation

[Alexander Shorin]

...and, if so, why lambda's?(: Without backward compatibility point I
see that they are getting "unofficially" deprecated and their usage is
dishonoured.

--
,,,^..^,,,


On Thu, Aug 1, 2013 at 6:53 PM, Ronald Oussoren <ronaldoussoren at mac.com> wrote:
>
> On 1 Aug, 2013, at 16:48, Alexander Shorin <kxepal at gmail.com> wrote:
>
>> Hi Ronald,
>>
>> I understand this, but I'm a bit confused about fate of lambdas with
>> such guideline since I see no more reasons to use them with p.9
>> statement: long lines, code duplicate, no mock and well tests etc. -
>> all these problems could be solved with assigning lambda to some name,
>> but now they are looks useless (or useful only for very trivial cases)
>
> That sounds about right :-)
>
> Note that:
>
>    f = lambda x: x ** 2
>
> And:
>
>    def f(x): return x ** 2
>
> Are functionally equivalent and use the same byte code. The only differences
> are that the lambda saves two characters in typing, and the "def" variant has
> a more useful value in its __name__ attribute.
>
> IMHO The lambda variant also looks uglier (even with the def variant on a single line).
>
> Ronald
>
>> --
>> ,,,^..^,,,
>>
>>
>> On Thu, Aug 1, 2013 at 6:41 PM, Ronald Oussoren <ronaldoussoren at mac.com> wrote:
>>>
>>> On 1 Aug, 2013, at 16:34, Alexander Shorin <kxepal at gmail.com> wrote:
>>>
>>>> Hi Nick,
>>>>
>>>> On Thu, Aug 1, 2013 at 4:44 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>>>>> 9. Explicit guideline not to assign lambdas to names (use def, that's
>>>>> what it's for)
>>>>
>>>> Even for propose to fit chars-per-line limit and/or to remove
>>>> duplicates (especially for sorted groupby case)?
>>>
>>> When you do "name = lambda ..." you've created a named function, when you
>>> do that your better of using def statement for the reasons Nick mentioned
>>> in the PEP.
>>>
>>> Ronald
>>>
>>>>
>>>> --
>>>> ,,,^..^,,,
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>>>
>