making a valid file name...
horpner at yahoo.com
Tue Oct 17 19:19:20 CEST 2006
On 2006-10-17, Tim Chase <python.list at tim.thechases.com> wrote:
> If you're doing it on a time-critical basis, it might help to
> make "valid" a set, which should have O(1) membership testing,
> rather than using the "in" test with a string. I don't know
> how well the find() method of a string performs in relationship
> to "in" testing of a set. Test and see, if it's important.
The find method of (8-bit) strings is really, really fast. My
guess is that set can't beat it. I tried to beat it recently with
a binary search function. Even after applying psyco find was
still faster (though I could beat the bisect functions by a
little bit by replacing a divide with a shift).
This is not a book to be put down lightly. It should be thrown
with great force. --Dorothy Parker
More information about the Python-list