反射机制-白红宇

反射机制

阅读量：5334 次

发布时间：2019-06-15

本文共 1053 字，大约阅读时间需要 3 分钟。

反射：通过字符串的形式去模块，对象中找寻指定的函数（方法）并执行。

hasattr

class Person(object):    def talk(self):        print('skr')p = Person()print(hasattr(p, 'talk'))print(hasattr(p, 'say_hello'))# True# False

getattr

class Person(object):    def talk(self):        print('skr')p = Person()func = getattr(p, 'talk')print(func)func()# 
     
      ># skr

setattr

def say_hello(self):    print('hello!')class Person(object):    def talk(self):        print('skr')p = Person()setattr(p, 'say_hello', say_hello)p.say_hello(p) # hello!

delattr

class Person(object):    def talk(self):        print('skr')p = Person()delattr(p, 'talk')p.talk()Traceback (most recent call last):  File "oop.py", line 8, in 
     
          delattr(p, 'talk')AttributeError: 'Person' object attribute 'talk' is read-only p = Person() setattr(p, 'hehe', 111) p.hehe delattr(p, 'hehe') p.hehe Traceback (most recent call last):   File "oop.py", line 12, in 
      
            p.hehe AttributeError: 'Person' object has no attribute 'hehe'

转载于:https://www.cnblogs.com/allenzhang-920/p/9503167.html

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