On 1 Aug, 2013, at 17:03, Alexander Shorin <kxe...@gmail.com> wrote:
> ...and, if so, why lambda's?(: Without backward compatibility point I > see that they are getting "unofficially" deprecated and their usage is > dishonoured. They are still usefull for simple functions that you use in one place, such as the key argument to sorted. By the time you assign a name to the function and give it unittests you may as well use a def-statement and let the function know it its own name. Ronald > > -- > ,,,^..^,,, > > > On Thu, Aug 1, 2013 at 6:53 PM, Ronald Oussoren <ronaldousso...@mac.com> > wrote: >> >> On 1 Aug, 2013, at 16:48, Alexander Shorin <kxe...@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 <ronaldousso...@mac.com> >>> wrote: >>>> >>>> On 1 Aug, 2013, at 16:34, Alexander Shorin <kxe...@gmail.com> wrote: >>>> >>>>> Hi Nick, >>>>> >>>>> On Thu, Aug 1, 2013 at 4:44 PM, Nick Coghlan <ncogh...@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 >>>> >>>>> >>>>> -- >>>>> ,,,^..^,,, >>>>> _______________________________________________ >>>>> Python-Dev mailing list >>>>> Python-Dev@python.org >>>>> http://mail.python.org/mailman/listinfo/python-dev >>>>> Unsubscribe: >>>>> http://mail.python.org/mailman/options/python-dev/ronaldoussoren%40mac.com >>>> >> _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
