Strategy pattern example in python with two different ways of providing a strategy

strategy_recipe.py

import types
from functools import partial


class Resource1(object):
    def __init__(self, value, update_strategy):
        self.value = value
        self.update = types.MethodType(update_strategy, self)

class Resource2(object):
    def __init__(self, value, update_strategy):
        self.value = value
        self.update = partial(update_strategy, self)  # alternative

class Update(object):
    def __init__(self, resource_cls, n=1):
        self.n = n
        self.resource = resource_cls(0, self._update)

    @property
    def value(self):
        return self.resource.value

    def _update(self, resource):
        resource.value += self.n

    def run(self):
        self.resource.update()


def main():
    def update(resource):
        resource.value += 1

    def update_n(resource, n):
        resource.value += n

    for resource_cls in [Resource1, Resource2]:
        x = resource_cls(0, update)
        x.update()
        print(x.value)

        x = resource_cls(0, update_n)
        x.update(2)
        print(x.value)

        z = Update(resource_cls)
        z.run()
        print(z.value)

        z = Update(resource_cls, 2)
        z.run()
        print(z.value)

if __name__ == '__main__':
    main()