On 2006-05-02, Boris Borcic <[EMAIL PROTECTED]> wrote:
> Grant Edwards wrote:
>> Python knows how to count. :)
>>
>> def countFalse(seq):
>> return len([v for v in seq if not v])
>>
>> def countTrue(seq):
>> return len([v for v in seq if v])
>>
>> def truth_test(seq):
>> return countTrue(seq) == 1
>>
>
> I'd suggest the more direct
>
> def countFalse(seq) :
> return sum(1 for v in seq if not v)
I guess I don't see how that is more direct.
If you want to know how many items are in a seqneuce, you call
len().
That's what it's for.
The number of objects in a list is returned in O(1) time by
len(sequence).
Converting that list to a list of 1's and then summing the 1's
is O(N).
--
Grant Edwards grante Yow! Actually, what
at I'd like is a little toy
visi.com spaceship!!
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