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How to call methods between different classes in python

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2019-06-29 14:26:2710442browse

How to call methods between different classes in python

Call of attributes and methods between classes in Python

class A(object):  #定义一个类
        name='python' #类属性
        def __init__(self): #实例属性
                self.age=18
    def a_print(self):  #实例方法
            print('aaa')
    @classmethod   #类方法
    def b_print(cls):  #cls指代当前的类
            print(cls.__name__)  #获取当前类名
    @staticmethod   #静态方法
    def c_print():
            print('static')
print(A.name) #调用类属性
A.b_print() #调用类方法
# print(A.age) 不可以调用实例属性
print(A().age)  #匿名实例对象可以调用实例属性
a_obj=A() # 类对象 可以调用这个类中所有方法和属性
print(a_obj.age)
print(a_obj.name)
a_obj=A()       #在外部生成一个对象
a_obj.num=1000  #对 对象增加一个额外属性,并赋值
def func(a_obj):  #再把这个对象传递到另一个方法中
        print(a_obj.num) #这个方法中我就可以拿到这个对象,并用这个对象获取到这个对象额外添加       的数据
func(a_obj)
#可以在方法中传递数据
#一个类想要调用另一个类的方法和属性,有两种形式
# 1.继承
# 2.把另外一个对象传递到这个类中,在这个类中调用实例对象
#  把一个类当做是另一个类的属性,通过属性调用的方式调用另一个类的方法
class B(object):
        def __init__(self):
            self.a_obj=A() #把A对象直接作为B的属性
        def func(self,a_obj):
            print(a_obj.num)
            a_obj.a_print()
b_obj=B()
b_obj.a_obj.a_print()
b_obj.a_obj.b_print()
b_obj=B()
b_obj.func(a_obj)

Example:

son.py and all.py are in Under the same folder, you can call each other through from son import * or import son.

You can dynamically instantiate the SON class in son.py, and you can also pass the instance of ALL to SON through parameters to call the method of the ALL class.

all.py

from son import *
class ALL():
 def __init__(self):
  self.mSon = SON(self)
 def getAll(self):
  print "=================getall---------------"
  return self.mSon.getSon()
 def getAlltest(self):
  print "=================getAlltest---------------"
Instance = ALL()
Instance.getAll()

son.py

class SON():
 def __init__(self, instance):
 self.mBattle = instance
 def getSon(self):
 return self.mBattle.getAlltest()

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