I believe most programming languages evaluate 0 to mean False, and
anything else to be True (for the purposes of boolean evaluation).
Python is no exception.
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of jelle feringa
Sent: Wednesday, October 31, 2007 8:56 AM
To: Luis Zarrabeitia
Cc: python-list@python.org
Subject: Re: shouldn't 'string'.find('ugh') return 0, not -1 ?
There is a subtle point though.
If the substring is not found '_'.find(' '), will return -1
Semanticly, I was expecting the that if the substring was not
found, the conditional statement would not be found.
However, python evaluates -1 to True, so that is what I do find
confusing.
So, I was arguing that '_'.find(' ') might return 0, however
that is obviously ambigious, since 0 might be an index as well.
So, perhaps I should rephrase and ask, why if -1 evaluates to
True?
I think that's pretty ugly...
cheers,
-jelle
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