Cycle around a sequence

Mark Lawrence breamoreboy at yahoo.co.uk
Wed Feb 8 02:10:28 CET 2012


I'm looking at a way of cycling around a sequence i.e. starting at some 
given location in the middle of a sequence and running to the end before 
coming back to the beginning and running to the start place.  About the 
best I could come up with is the following, any better ideas for some 
definition of better?

PythonWin 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit 
(Intel)] on win32.
Portions Copyright 1994-2008 Mark Hammond - see 'Help/About PythonWin' 
for further copyright information.
 >>> from itertools import chain
 >>> a=range(10)
 >>> g = chain((a[i] for i in xrange(4, 10, 1)), (a[i] for i in xrange(4)))
 >>> for x in g: print x,
...
4 5 6 7 8 9 0 1 2 3
 >>>
-- 
Cheers.

Mark Lawrence.




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