looking for a neat solution to a nested loop problem
Nobody
nobody at nowhere.com
Mon Aug 6 12:18:09 EDT 2012
On Mon, 06 Aug 2012 17:52:31 +0200, Tom P wrote:
> consider a nested loop algorithm -
>
> for i in range(100):
> for j in range(100):
> do_something(i,j)
>
> Now, suppose I don't want to use i = 0 and j = 0 as initial values, but
> some other values i = N and j = M, and I want to iterate through all
> 10,000 values in sequence - is there a neat python-like way to this?
for i in range(N,N+100):
for j in range(M,M+100):
do_something(i,j)
Or did you mean something else?
Alternatively:
import itertools
for i, j in itertools.product(range(N,N+100),range(M,M+100)):
do_something(i,j)
This can be preferable to deeply-nested loops.
Also: in 2.x, use xrange() in preference to range().
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