class Call:
    def __call__(self):
        pass

class Foo:
    def __init__(self):
        self.var = Call()

    def method(self):
        pass

foo = Foo()



def method_exists(instance, method):
    return method in dir(instance) and callable(instance.method)
    

print(method_exists(foo, "method"))
print(method_exists(foo, "var"))