[issue1145] Allow str.join to join non-string types (as per PEP 3100)

[Guido van Rossum]

Guido van Rossum added the comment:

I like this, but the patch has problems: you don't error-check the
return value from PyObject_Unicode() or PyUnicode_FromObject() (and why
do you need the latter call anyway?)

Also in the docstring I would reference str() instead of __str__().

There are also a few lines longer than 80 chars.

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assignee:  -> gvanrossum
nosy: +gvanrossum

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