python - 调用当前类的类中的调用方法

Question

我怎么能称方法'z'？他最好的方法是什么？和一个对象？

文件 test1.py：

from test2 import Test2

class Test1(object):
    def __init__(self):
        pass
    def a(self):
        print("Running a of Test1")
        test_instance2 = Test2()
    def z(self):
        print("Running z of Test1")

if __name__ == '__main__':
    test_instance = Test1()
    test_instance.a()

文件 test2.py：

class Test2:
    def __init__(self):
        self.b()
    def b(self):
        print('Running b of Test2')
        print('Here I want to call method z of Test1') # < How call z in Test1?

运行为：

python test1.py

提前致谢！:) 很抱歉这个基本问题 :$

Answer 1

您必须传入对Test1实例的引用：

class Test1(object):
    def __init__(self):
        pass
    def a(self):
        print("Running a of Test1")
        test_instance2 = Test2(self)
    def z(self):
        print("Running z of Test1")

class Test2:
    def __init__(self, a):
        self.b(a)
    def b(self, a):
        print('Running b of Test2')
        a.z()

您也可以将a引用存储在Test2实例上：

class Test2:
    def __init__(self, a):
        self.a = a
        self.b()
    def b(self, a):
        print('Running b of Test2')
        self.a.z()