That's cool! Of course, walk returns a generator, so using a list comprehension to turn it into a list seems natural, but I didn't realize that list() does the same thing (and neither, apparently, did the original implementor) -- although, with a little reflection, it obviously must!
Yup. Also worth noting is that if you want the scoping rules of generator expression, but need a list instead, you can just call list with the generator expression:
py> x Traceback (most recent call last): File "<interactive input>", line 1, in ? NameError: name 'x' is not defined py> [pow(x, 7, 23) for x in range(10)] [0, 1, 13, 2, 8, 17, 3, 5, 12, 4] py> x 9 py> del x py> x Traceback (most recent call last): File "<interactive input>", line 1, in ? NameError: name 'x' is not defined py> list(pow(x, 7, 23) for x in xrange(10)) [0, 1, 13, 2, 8, 17, 3, 5, 12, 4] py> x Traceback (most recent call last): File "<interactive input>", line 1, in ? NameError: name 'x' is not defined
Note that with the generator expression, 'x' doesn't get leaked to the enclosing scope.
Steve -- http://mail.python.org/mailman/listinfo/python-list
