[Tutor] How to determine if every character in one string is inanother string?
kent37 at tds.net
Tue Jul 24 04:30:14 CEST 2007
wesley chun wrote:
> from string import printable as prglobal
> def printable(s):
> prlocal = prglobal
> for x in s:
> if x not in prlocal:
> return False
> return True
> the solutions using LCs above are great when it comes to an expressive
> piece of code in a one-liner, but i feel there's a waste of
> time/memory. the use of GEs is better, but it still has to iterate
> over the entire string when i don't feel that it should be necessary
> as per my example. anyway, just my $0.02! not the shortest, but
> hopefully the fastest!
any() and all() also short-circuit, and they move the iteration out of
Python into the C runtime. My guess is the solutions with any() and
all() and equivalent hoisting of string.printable will be faster than
yours, but I don't want to take the time to check ATM...I would also try
using set(string.printable) instead of string.printable...
Anyone feel like spending some time with timeit? Otherwise we're just
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