Steven D'Aprano <[EMAIL PROTECTED]> writes: > >> >>> pairs = (test[i:i+2] for i in xrange(len(test)-1)) > >> >>> for a,b in pairs: > >> ... print a,b > > > > for a, b in zip(test, test[1:]): > > print a, b > > May be unfortunately slow if test is half a gigabyte of data, what with > essentially making three copies of it. Lazy procedures like the generator > expression above are often much better.
Untested: from itertools import izip, islice for a,b in izip(test, islice(test,1,None)): print a,b seems more natural. -- http://mail.python.org/mailman/listinfo/python-list