import functools

def f(x,y):

    if x < y:

        return 1

    elif x > y:

        return -1

    else:

        return 0

sorted_ignore_case = functools.partial(sorted, cmp = f(x,y))

print sorted_ignore_case(['bob', 'about', 'Zoo', 'Credit'])

这样写就会出现函数调用语法错误，求热心人解答