Hi, I am teaching Python this semester and as I am trying to explain the code by Raymond Hettinger, I need to make it simpler (this is an introductory course). And it ends up to be just 9 lines of code.
Just for fun. See also: http://diveintopython3.org/advanced-iterators.html Regards, Yingjie ############Code starts here########### import itertools def solve(puzzle): "solve alphametic puzzles in just 9 lines of code." words = [w for w in puzzle.split() if w.isalpha()] nonzeros = {w[0] for w in words} others = {a for a in ''.join(words) if a not in nonzeros} chars = [ord(c) for c in nonzeros]+[ord(c) for c in others] assert len(chars) <= 10, 'Too many letters' for guess in itertools.permutations('0123456789', len(chars)): if '0' not in guess[:len(nonzeros)]: equation = puzzle.translate(dict(zip(chars, guess))) if eval(equation): return equation -- http://mail.python.org/mailman/listinfo/python-list
