Question

嘿，伙计们需要知道如何在B类的classA中启动一个方法

有

 classA(object):
      def __init__(self):
 #this is where the ClassB method'' def multiplyPeople() ''should be called or started.

 classB(object):
     def  multiplyPeople(self):

给出错误

  TypeError: unbound method multiplyPeople() must be called 
with classB instance as first argument (got nothing instead)

知道这是基本的东西，但我想弄清楚到底应该做什么以及我迷路了哪里。

我称之为

 classA(object):

 def__init__(self):
 self.PeopleVariable=classB.multiplyPeople()

Answer 1

这取决于您希望函数的工作方式。你只是想把这个类用作占位符吗？然后，您可以使用所谓的静态方法，您不需要实例化对象。

或者您可以使用常规方法并在创建的对象上使用它（请注意，您可以访问self）

class A():
    def __init__(self):
        b = B()
        b.non_static()

        B.multiplyPeople()

class B():
    @staticmethod
    def multiplyPeople():
        print "this was called"

    def non_static(self):
        print self, " was called"

if __name__ == "__main__":
    a = A()

输出：

<__main__.B instance at 0x7f3d2ab5d710>  was called
this was called

如何在python中从另一个类启动或调用函数？

1 个答案: