Message 302427 - Python tracker

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Author	kgashok
Recipients	docs@python, kgashok, serhiy.storchaka
Date	2017-09-18.08:57:10
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1505725030.18.0.0499336276531.issue31504@psf.upfronthosting.co.za>
In-reply-to

Content
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.

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.

History
Date	User	Action	Args
2017-09-18 08:57:10	kgashok	set	recipients: + kgashok, docs@python, serhiy.storchaka
2017-09-18 08:57:10	kgashok	set	messageid: <1505725030.18.0.0499336276531.issue31504@psf.upfronthosting.co.za>
2017-09-18 08:57:10	kgashok	link	issue31504 messages
2017-09-18 08:57:10	kgashok	create