python: NameError：global name '…‘ is not defined [duplicate]

问题

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• Python: NameError: global name 'foobar' is not defined [duplicate] 1 answer

in my code, I have:

class A:
    def a():
        ......

    def b():
        a()
        ......
    b()

Then the compiler will say "NameError: global name a() is not defined." If I pull all the stuffs out of the class A, it would be no problem, but how can I define the method in class A? Thank you very much.

回答1:

You need to call self.a() to invoke a from b. a is not a global function, it is a method on the class.

You may want to read through the Python tutorial on classes some more to get the finer details down.

来源：https://stackoverflow.com/questions/17557190/python-nameerror-global-name-is-not-defined