looking for a neat solution to a nested loop problem

Thu Aug 9 14:39:56 EDT 2012

Nobody於 2012年8月7日星期二UTC+8下午11時32分55秒寫道：
> On 2012年8月06日 21:02:33 -0700, Larry Hudson wrote:
>>>> >> for i in range(N,N+100):
>> >> for j in range(M,M+100):
>> >> do_something(i % 100 ,j % 100)
>> >>
>> >> Emile
>> > 
>> > How about...
>> > 
>> > for i in range(100):
>> > for j in range(100):
>> > do_something((i + N) % 100, (j + M) % 100)
>>>> Both of these approaches move the modifications to the sequence into the
>> body of the loop. It may be preferable to iterate over the desired
>> sequence directly. E.g.
>>>> 	for i in ((N + ii) % 100 for ii in xrange(100)):
>> 	 for j in ((M + jj) % 100 for jj in xrange(100)):
>> 	 do_something(i, j)

Nobody於 2012年8月7日星期二UTC+8下午11時32分55秒寫道：
> On 2012年8月06日 21:02:33 -0700, Larry Hudson wrote:
>>>> >> for i in range(N,N+100):
>> >> for j in range(M,M+100):
>> >> do_something(i % 100 ,j % 100)
>> >>
>> >> Emile
>> > 
>> > How about...
>> > 
>> > for i in range(100):
>> > for j in range(100):
>> > do_something((i + N) % 100, (j + M) % 100)
>>>> Both of these approaches move the modifications to the sequence into the
>> body of the loop. It may be preferable to iterate over the desired
>> sequence directly. E.g.
>>>> 	for i in ((N + ii) % 100 for ii in xrange(100)):
>> 	 for j in ((M + jj) % 100 for jj in xrange(100))

list(range(N,100))+list(range(1,N)) //good for i
I contribute my python code here to avoid any divison.