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:
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# -*- 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)
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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。
原文链接:https://blog.csdn.net/fanfen88/article/details/78309898