确定 for 循环是遍历列表还是生成器

Question

Is there a way to tell whether, in python, you are iterating through a list or a generator?

for i in range(10):
     print some_param     # will identify as a list

for i in xrange(10):
     print some_param     # will identify as a generator

Answer 1

In general, no. You can do unpleasant things like isinstance(my_iterable, type(iter(xrange(1)))) vs isinstance(my_iterable, type(iter([]))) , but with the bare iterator interface, generators and lists are indistinguishable to their clients.