How to make it picklable?

e.py

#!/usr/bin/env python
import functools
import pickle

# https://stackoverflow.com/questions/20093811/how-do-i-change-the-representation-of-a-python-function/20094262#20094262
class simple_repr(object):
    def __init__(self, functor):
        self.functor = functor
        self.__name__ = functor.__name__
        self.__doc__ = functor.__doc__

    def __call__(self, *args, **kwargs):
        return self.functor(*args, **kwargs)

    def __repr__(self):
        return self.functor.__name__

@simple_repr
def func(a, b):
    print(a, b)

print(str(func))
print(repr(func))

p = pickle.dumps(func)
hunc = pickle.loads(p)
print(str(hunc))
print(repr(hunc))
hunc(a='def', b=123)