[Python-ideas] SyntaxWarning for for/while/else without break or return?

Steven D'Aprano steve at pearwood.info
Fri Oct 9 04:28:09 CEST 2009

On Thu, 8 Oct 2009 08:59:21 pm Stefan Rank wrote:
> In the return-but-no-break-example I had in mind::
>    def findit(bag):
>        for elem in bag:
>            if isgreat(elem):
>                return elem
>        else:
>            return default
> the use of else, though correct and arguably readable, is still
> unnecessary.

We should raise UnnecessaryNotActuallyAnError then.

There is lots of code which is correct and readable while still 
unnecessary. Should we ban these too?


flag = True and flag

if (flag is True) is True:

while False:

if True:
elif False:

[item for item in seq if True]

alist.sort(key=lambda x: x)

and so forth. Just think, with a bit of imagination we can slow the 
compiler down by a factor of two, three or even ten, by prohibiting all 
sorts of perfectly legal code!

Steven D'Aprano

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