On Tue, 02 May 2006 18:52:48 GMT in comp.lang.python, John Salerno
<[EMAIL PROTECTED]> wrote:
[...]
>
>Yeah, after trying some crazy things, I just wrote it this way:
>
>def truth_test(seq):
> truth = 0
> for item in seq:
> if item:
> truth += 1
> if truth == 1:
> return True
> else:
> return False
You could replace those last four lines with
return truth == 1
>
>Not sure I like having to keep a counter though, but the other stuff I
Well, if you want something minimalist, you could try
def truth_test(seq):
return sum(1 for item in seq if item) == 1
Though I'm not sure it's really any clearer...
>did was really convoluted, like checking to see if the first item was
>True, and if it was, popping it from the list and iterating over the
>rest of the items (needless to say, the in-place change wasn't helpful).
Perhaps something like
def truth_test(seq):
found = False
for item in seq:
if item:
if found:
return False
found = True
return found
Gets you an early exit, anyway...
All code untested. Regards,
-=Dave
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