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Wed Mar 18 12:47:18 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-March/087296.html

Martin v. Löwis wrote:
> Certainly, the doc string is wrong:
> 
>   isub(a, b) -- Same as a -= b.
> 
> That's not quite the same - you would have to write
> 
>   a = isub(a, b) -- Same as a -= b.

It seems a perfectly fine solution is simply to fix the docstring, 
exactly like that:

a = isub(a, b) -- Same as a -= b.

This both corrects the error when using isub with immutable types and 
educates user as to how a -= b actually works.

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[Python-Dev] In-place operators