Rodney Maxwell wrote: > The following are apparently legal Python syntactically: > L[1:3, 8:10] > L[1, ..., 5:-2] > > But they don't seem to work on lists: >>>> l = [0,1,2,3] >>>> l[0:2,3] > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: list indices must be integers >>>> l[...] > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: list indices must be integers > > So where is this extended slicing used?
AFAICT this syntax is not used in the standard library. However, the mega-beauty of it is that you can make use of it in your own classes: py> class Bob(list): ... def __getitem__(self, i): ... try: ... return [list.__getitem__(self, j) for j in i] ... except TypeError: ... return list.__getitem__(self, i) ... py> b = Bob(xrange(15, 30)) py> b[3, 5, 7, 13] [18, 20, 22, 28] James -- http://mail.python.org/mailman/listinfo/python-list
