question about True values
John Coleman
jcoleman at franciscan.edu
Wed Oct 25 21:16:42 CEST 2006
Paul Rubin wrote:
> John Salerno <johnjsal at NOSPAMgmail.com> writes:
> > 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?
>
> No. True and False are boolean values, where booleans are a different
> data type from strings, just like strings are different from integers.
>
> >>> if s:
> print 'hi'
>
> converts s to a boolean during evaluation. That is, it's the same as
>
> if bool(s): print 'hi'
>
> bool(s) is a function that converts s to a bool. If s is a string,
> bool(s) is true if s is nonempty, false otherwise.
>
> A comparable thing with integers: suppose
>
> x = 3.1
>
> then "x == 3" is false, but "int(x) == 3" is true.
But then why is 3.0 == 3 true? They are different types.
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