[issue29549] Improve docstring for str.index

[Ben Hoyt]

Ben Hoyt added the comment:

Good call. Additionally, it's weird to me that the docstring for str.find() says "Return -1 on failure." because the string not being found is not a "failure". Like the docs (https://docs.python.org/3.5/library/stdtypes.html#str.find) say, the str.find() docstring should say "Return -1 if sub is not found."

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nosy: +benhoyt

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<http://bugs.python.org/issue29549>
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