On Friday, 4 March 2022 02:18:51 EST Chris Angelico wrote: > On Fri, 4 Mar 2022 at 18:13, Dieter Maurer <die...@handshake.de> wrote: > > Rob Cliffe wrote at 2022-3-4 00:13 +0000: > > >I find it so hard to remember what `for ... else` means that on the > > >very few occasions I have used it, I ALWAYS put a comment > > >alongside/below the `else` to remind myself (and anyone else > > >unfortunate enough to read my code) what triggers it, e.g. > > > > > > for item in search_list: > > > ... > > > ... break > > > > > > else: # if no item in search_list matched the criteria > > > > > >You get the idea. > > >If I really want to remember what this construct means, I remind > > >myself that `else` here really means `no break`. Would have been > > >better if it had been spelt `nobreak` or similar in the first > > >place. > > > > One of my use cases for `for - else` does not involve a `break`: > > the initialization of the loop variable when the sequence is empty. > > It is demonstrated by the following transscript: > > > > ```pycon > > > > >>> for i in range(0): > > ... pass > > ... > > > > >>> i > > > > Traceback (most recent call last): > > File "<stdin>", line 1, in <module> > > > > NameError: name 'i' is not defined > > > > >>> for i in range(0): > > ... pass > > ... else: i = None > > ... > > > > >>> i > > > > ``` > > > > For this use case, `else` is perfectly named. > > What's the point of this? Why not just put "i = None" after the loop? > That makes the logic work, but who then cleans up the trash on the stack. Thats a memory leak.
> ChrisA > -- > https://mail.python.org/mailman/listinfo/python-list > . Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis -- https://mail.python.org/mailman/listinfo/python-list
