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kwargs.py

class MyClass(object):
    def method_a(self, **kwargs):
        self.method_b('arg_x_value', **kwargs)

    def method_b(self, arg_x, arg_y=None, **kwargs):
        print arg_y
        self.method_c(**kwargs)

    def method_c(self, arg_z=None):
        print arg_z


MyClass().method_a(arg_y="somevalue_arg_y", arg_z="somevalue_arg_z")