Python: How to get Outer class variables from inner static class?

问题

I want to specify variable once by making instance Outer(variable), than this variable use in all static classes, how should I do that? Is there any other solution than use not static methods and pass Outer into each inner class?

class Outer():
    def __init__(self, variable):
        self.variable= variable

    class Inner1():        
        @staticmethod
        def work1():
            **print Outer.variable**

    class Inner2():        
        @staticmethod
        def work2():
            **print Outer.variable**

回答1:

No. Inner-class methods have no way of accessing instances of the outer class.

回答2:

If you really want such thing, metaclass may help a little, for example:

from types import ClassType

class OuterMeta(type):
    def __new__(mcls, name, base, attr):
        ret = type.__new__(mcls, name, base, attr)
        for k, v in attr.iteritems():
            if isinstance(v, (ClassType, type)):
                v.Outer = ret
        return ret

class Outer(object):
    __metaclass__ = OuterMeta
    var = 'abc'    
    class Inner:
        def work(self):
            print self.Outer.var
        @classmethod
        def work2(cls):
            print cls.Outer.var

then

>>> Outer.Inner.work2()
abc

来源：https://stackoverflow.com/questions/10840270/python-how-to-get-outer-class-variables-from-inner-static-class