question about True values
python.list at tim.thechases.com
Wed Oct 25 21:28:11 CEST 2006
> I'm a little confused. Why doesn't s evaluate to True in the first part,
> but it does in the second? Is the first statement something different?
> >>> s = 'hello'
> >>> s == True
> >>> if s:
> print 'hi'
The "if s" does an implicit (yeah, I know, "explicit is better
than implicit") conversion to bool, like
And as such, you'll find that
bool(s) == True
You can learn more at
where you'll see that it's not really exactly a bool() call, but
that strings are a special case listed here. And if not, they
also have a __len__ method which would return zero/non-zero in
the even that strings weren't handled, making the "actual" test
(if strings weren't special-cased)
(s.__len__() <> 0) == True
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