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Showing content from https://mail.python.org/pipermail/python-dev/2001-October/017779.html below:

[Python-Dev] Need a way to test for 8-bit-or-unicode-string

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Guido van Rossum wrote:
> Here's an implementation of Neil's idea.
> 
> *** abstract.c	2001/10/01 17:10:18	2.83
> --- abstract.c	2001/10/05 15:49:04
> ***************
> *** 1805,1810 ****
> --- 1805,1829 ----
>   	else if (PyType_Check(cls)) {
>   		retval = PyObject_TypeCheck(inst, (PyTypeObject *)cls);
>   	}
> + 	else if (PySequence_Check(cls)) {
> + 		int i, n;

Is is possible that a type also passes PySequence_Check?  If so, that
could lead to confusing behavior.

  Neil

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