Author kgashok
Recipients docs@python, kgashok, serhiy.storchaka
Date 2017-09-18.08:57:10
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Message-id <1505725030.18.0.0499336276531.issue31504@psf.upfronthosting.co.za>
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The documentation (https://docs.python.org/3/library/stdtypes.html#str.find) does not describe what will be the behaviour if the substring is "". 

And by the way, as per https://docs.python.org/3/reference/expressions.html#membership-test-operations, 

    Empty strings are always considered to be a substring of any other 
    string, so "" in "abc" will return True.

Returning an invalid index value, although confusing, should at least be documented in some form.
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2017-09-18 08:57:10kgashoksetrecipients: + kgashok, docs@python, serhiy.storchaka
2017-09-18 08:57:10kgashoksetmessageid: <1505725030.18.0.0499336276531.issue31504@psf.upfronthosting.co.za>
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