1、类A调用类B的静态方法

class Person(object):

    def flying(self):
        Plane.fly()  # Person类调用Plane类的静态方法

    def do_flying(self):
        self.plane = Plane()
        self.plane.fly()


class Plane(object):

    @staticmethod
    def fly():
        print('i am flying!')


person = Person()
person.flying()

2、类B作为类A方法的形参

class Person(object):

    def flying(self, plane):
        plane.fly()


class Plane(object):

    def fly(self):
        print('i am flying!')


plane = Plane()
person = Person()
person.flying(plane)

3、类B作为类A方法的局部变量

class Person(object):

    def flying(self):
        self.plane = Plane()
        self.plane.fly()


class Plane(object):

    def fly(self):
        print('i am flying!')


person = Person()
person.flying()