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? ChrisA -- https://mail.python.org/mailman/listinfo/python-list
