On 6 August 2012 18:14, Tom P <werot...@freent.dd> wrote: > On 08/06/2012 06:18 PM, Nobody wrote: > >> 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? >> > > no, I meant something else .. > > j runs through range(M, 100) and then range(0,M), and i runs through > range(N,100) and then range(0,N) > > .. apologies if I didn't make that clear enough.
How about range(N, 100) + range(0, N)? Example (Python 2.x): >>> range(3, 10) [3, 4, 5, 6, 7, 8, 9] >>> range(0, 3) [0, 1, 2] >>> range(3, 10) + range(0, 3) [3, 4, 5, 6, 7, 8, 9, 0, 1, 2] In Python 3.x you'd need to do list(range(...)) + list(range(...)) or use itertools.chain. Oscar
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