Yury Selivanov <yseliva...@gmail.com> added the comment:
> I also couldn't figure out yet why PyUnicode_Check() was necessary in the
> first place. Doesn't PyObject_Str() just increment the refcount if the
> argument is already a string?
`str()` returns its argument if it's exactly a `builtins.str` instance. If
it's a subclass of str, it will construct a `builtins.str` out of it.
>>> class mystr(str):
... pass
>>> a = mystr('aaa')
>>> str(a) is a
False
So Eric is right, there's a small discrepancy between Python and C version.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34270>
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