Python - 方法链接来自不同类的实例

Question

我知道如何在单个类中实现 Python 中的方法链接，但我想知道是否有一种方法可以链接不同类中的方法，例如:

class C1:

    def sayHello(self):

        print "hello from c1"

        return self

class C2:

    def sayHello(self):

        print "hello from c2"

        return self

c1 = C1()

c2 = C2()

(c1.sayHello()).(c2.sayHello())

Output:
hello from c1
hello from c2

有什么想法吗？

Answer 1

您可以将其抽象为基类(以避免重复)，然后，只要它们彼此了解，您就可以近似您最初想要的内容:

class Base(object):

    def sayHello(self, other=None):
        print("hello from {self} to {other}".format(self=self, other=other))
        return other
    def __str__(self):
        return type(self).__name__

class C1(Base):
    '''C1!'''

class C2(Base):
    '''C2!'''

c1 = C1()
c2 = C2()

c1.sayHello(c2).sayHello(c1)

打印:

hello from C1 to C2
hello from C2 to C1