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我无法让命令cmp()工作.

这是代码:

a = [1,2,3]
b = [1,2,3]
c = cmp(a,b)
print (c)

我收到错误:

Traceback (most recent call last):
  File "G:\Dropbox\Code\a = [1,2,3]", line 3, in <module>
    c = cmp(a,b)
 NameError: name 'cmp' is not defined
[Finished in 0.1s]