[Python-ideas] Make "is" checks on non-singleton literals errors

Raymond Hettinger raymond.hettinger at gmail.com
Tue Oct 9 03:13:25 CEST 2012

On Oct 8, 2012, at 12:44 PM, Mike Graham <mikegraham at gmail.com> wrote:

> I regularly see learners using "is" to check for string equality and
> sometimes other equality. Due to optimizations, they often come away
> thinking it worked for them.
> There are no cases where
>    if x is "foo":
> or
>   if x is 4:
> is actually the code someone intended to write.
> Although this has no benefit to anyone but new learners, it also
> doesn't really do any harm.

This seems like a job for pyflakes, pylint, or pychecker.


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