[issue1259] string find and rfind methods give a TypeError that is misleading

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

I believe this is because string_find_internal() uses an O& with
_PyEval_SliceIndex() to convert its start and end arguments, but the
latter function does not accept None.  To fix this, you'd have to change
string_find_internal() to do its own argument checking for None before
calling _PyEval_SliceIndex.

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nosy: +barry

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