How to access outer class from an inner class?

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You’re trying to access Outer’s class instance, from inner class instance. So just use factory-method to build Inner instance and pass Outer instance to it.

class Outer(object):

    def createInner(self):
        return Outer.Inner(self)

    class Inner(object):
        def __init__(self, outer_instance):
            self.outer_instance = outer_instance
            self.outer_instance.somemethod()

        def inner_method(self):
            self.outer_instance.anothermethod()

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