human
Solve the following python programming problem given the following code:
def monkey_mix(cls, mixin, methods = None) : 
    '
    Mixes a mixin into existing class.
    Does not use actual multi-inheritance mixins, just monkey patches methods.
    Mixin methods can call copies of original ones stored in `_no_monkey` proxy:

    class SomeMixin(object):
        def do_smth(self, arg):
            ... do smth else before
            self._no_monkey.do_smth(self, arg)
            ... do smth else after
    ' 
    assert ('_no_monkey' not in cls.__dict__), 'Multiple monkey mix not supported' 
    cls._no_monkey = MonkeyProxy (methods) 
    if (methods is None) : 
        isboundmethod = (inspect.isfunction if six.PY3 else inspect.ismethod) 
        methods = inspect.getmembers (mixin, isboundmethod) 
else : 
        methods = [(m, getattr (mixin, m)) for m in methods] 
for (name, method) in methods : 
        if hasattr (cls, name) : 
            setattr (cls._no_monkey, name, getattr (cls, name)) 
setattr (cls, name, six.get_unbound_function (method)) 

    
    

    Fix the buggy line: cls._no_monkey = MonkeyProxy (methods)
assistant
#Here is Python program to fix the buggy line: cls.

cls._no_monkey = MonkeyProxy (cls)