On Wed, Aug 28, 2002 at 12:40:30PM +1200, Greg Ewing wrote: > Oren Tirosh <oren-py-d@hishome.net>: > > > > Hmmm, in other words, cartesian() is a lazy version > > > of zip(). > > > > Nope. > > > > >>> zip([1, 2], ['a', 'b']) > > [(1, 'a'), (2, 'b')] > > > > >>> list(cartesian([1, 2], ['a', 'b'])) > > [(1, 'a'), (1, 'b'), (2, 'a'), (2, 'b')] > > Sorry, BrainError. In that case, it's probably > faster to use the nested loops -- unless > cartesian() were implemented in C. Yes, but a nested loop cannot be easily passed as an argument to a function. Generator functions are pretty efficient, too - yield does not incur the relatively high overhead of Python function calls. Oren
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