On Mon, 02 Nov 2009 20:06:51 -0800, Anh Hai Trinh wrote: >> Yes, just about any ‘map()’ operation has a corresponding list >> comprehension. (Does anyone know of a counter-example, a ‘map()’ >> operation that doesn't have a correspondingly simple list >> comprehension?) > > Try turning this into a list comprehension: > > vectorsum = lambda *args: map(sum, zip(*args)) > > vectorsum([1,2], [3,4], [5,6]) > ->[9, 12] > vectorsum([1,2], [3,4], [5,6], [7,8]) > ->[16, 20]
[sum(t) for t in zip(*args)] will do it. >>> args = [1,2], [3,4], [5,6] >>> [sum(t) for t in zip(*args)] [9, 12] >>> args = [1,2], [3,4], [5,6], [7,8] >>> [sum(t) for t in zip(*args)] [16, 20] -- Steven -- http://mail.python.org/mailman/listinfo/python-list
