Posted in Python onJuly 25, 2018
本文实例讲述了Python实现动态添加属性和方法操作。分享给大家供大家参考,具体如下:
# -*- coding:utf-8 -*- #!python3 class Person(): def __init__(self, name, age): self.name = name self.age = age p1 = Person('ff', '28') print(p1.name, p1.age) # 给实例对象动态添加sex属性 p1.sex = 'female' print(p1.sex) # 给类动态添加属性 Person.height = None print(Person.height) p1.height = '155' print(p1.height) # 动态定义一个方法 def run(self, speed): print('run with %d speed' % speed) # 给实例绑定方法 import types p1.run = types.MethodType(run, p1) p1.run(30) # Person.run = run # 运行错误 # Person.run(4) @classmethod def run2(a, speed): print('run with %d m/s' % speed) # 给类动态绑定方法 Person.run2 = run2 # 给类绑定的方法, 需加修饰器 @classmethod, 标定其为类方法,可被类添加 Person.run2(4) p1.run2(5) # 类的实例对象也可调用类动态添加的方法 @staticmethod def eat(): print('eat---') Person.eat = eat # 类可添加静态方法, 定义静态方法时,需加修饰器@staticmethod Person.eat() p1.eat() # 实例对象同样可调用类动态添加的静态方法 del p1.name # del 删除属性 delattr(p1, 'sex') print(p1.name, p1.sex)
运行结果:
ff 28
female
None
155
run with 30 speed
run with 4 m/s
run with 5 m/s
eat---
eat---
Traceback (most recent call last):
File "/home/python/Desktop/test/12_动态语言.py", line 41, in <module>
print(p1.name, p1.sex)
AttributeError: 'Person' object has no attribute 'name'
希望本文所述对大家Python程序设计有所帮助。
Python实现动态添加属性和方法操作示例
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