Python关于反射的实例代码分享

#!/usr/bin/env python
#-*-coding:utf8-*-

def bulk(self):
  print("%s is jiao ...."%self.name)

class Dog(object):
  def __init__(self,name):
    self.name=name

  def eat(self,food):
    print("%s is eating ...."%self.name,food)

d= Dog("dfxa")
choice = input(":").strip()

if hasattr(d,choice): #判断一个d（对象）里是否有对应的choice字符串方法

  # delattr(d,choice) # Deletes the named attribute from the given object.
  # delattr(x, 'y') is equivalent to ``del x.y''
  # 相当于 del d.choice

   func = getattr(d,choice) #根据字符串去获取d对象里的对应方法的内存地址
   func("cheng")
  # attr = getattr(d,choice)
  # setattr(d,choice,"drr")

else:
  # 将给定对象的命名属性设置为指定值
  setattr(d,choice,22) # choice是字符串，相当于 d.choice = z
  print(getattr(d,choice))
print(d.name)

def bulk(self):
  print("%s is jiao ...."%self.name)

class Dog(object):
  def __init__(self,name):
    self.name=name

  def eat(self,food):
    print("%s is eating ...."%self.name,food)

d= Dog("dfxa")
choice = input(":").strip()

if hasattr(d,choice): #判断一个d（对象）里是否有对应的choice字符串方法
   func = getattr(d,choice) #根据字符串去获取d对象里的对应方法的内存地址
   func("cheng")
  #不能直接print(d.choice) ,choice是一个字符串，应该按照下面的方法写
  # attr = getattr(d,choice)
  # print(attr)

else:
   setattr(d,choice,bulk)
   # 运行程序，输入talk相当于 d.talk = bulk，把bulk的内存地址赋给了talk
   # 此时函数就是talk，talk() == 调用bulk()
   #d.talk(d) #所以这里只能调用talk()
   #动态的把类外面的方法装配到类里，通过字符串的形式，但调用需要把自己（对象）传进去
   #这样的话就把函数写死了，另一种写法
   func2 = getattr(d,choice)
   func2(d) #这样不管输入的是talk还是bulk都可以

:talk

dfxa is jiao ....