Serhiy Storchaka added the comment:

This is definitely non-trivial. 1-argument int() works with UserString because 
__int__() method is defined for UserString (as __float__(), as __complex__()). 
I.e. UserString looks as number-like for it. Unfortunately there is no way to 
make a class be string-like without inheriting it from str class.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16773>
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