On Feb 8, 5:09 pm, c james <[EMAIL PROTECTED]> wrote:
> Try this
>
> >>> sample = {'t':True, 'f':False}
> >>> 't' in sample
> True
> >>> type('t' in sample)
> <type 'bool'>
> >>> 't' in sample == True
>
> False
>
> Why is this? Now try>>> bool('t' in sample) == True
>
> True
>
> Can someone explain what is going on?
This is because in Python '==' and 'in' are comparison operators and
in Python you can chain comparisons.
Typical usage is:
if 3 <= x < 9: # meaning (3 <= x) and (x < 9)
# do something...
So 't' in sample == True means the same as
('t' in sample) and (sample == True)
Which will never be true as sample is a dictionary.
To solve this, use brackets:
>>> ('t' in sample) == True
True
HTH
--
Arnaud
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