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Showing content from https://mail.python.org/pipermail/python-dev/2011-May/111523.html below:

[Python-Dev] Don't set local variable in a list comprehension or generator

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On 5/18/2011 10:19 AM, Nadeem Vawda wrote:

> I'm not sure why you would encounter code like that in the first place.
> Surely any code of the form:
> 
> ''.join(c for c in my_string)
> 
> would just return my_string? Or am I missing something?

You might more-or-less legitimately encounter it if the generator expression
originally contained a condition which got removed.

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