Reflect反射
通过字符串操作类对象 或者 模块中的相关成员的操作
hasattr
# 检测对象/类是否有指定的成员
# return bool
class Father():
pass
class Mother():
pass
class Children(Father,Mother):
eye = "蓝色的"
weight = "1吨"
def eat(self):
print("小孩下生会喝奶")
def drink(self):
print("小孩下生喜欢喝勇闯天涯...")
def __la(self):
print("小孩自动啦,无法控制")
obj = Children()
# (1)hasattr() 检测]对象/类是否有指定的成员
# 对象
res = hasattr(obj,"eye")
print(res) # return true
# 类
res = hasattr(Children,"eat123")
print(res) # return false
getattr
# getattr() 获取对象/类成员的值
# 属性或方法
class Father():
pass
class Mother():
pass
class Children(Father,Mother):
eye = "蓝色的"
weight = "1吨"
def eat(self):
print("小孩下生会喝奶")
def drink(self):
print("小孩下生喜欢喝勇闯天涯...")
def __la(self):
print("小孩自动啦,无法控制")
# 对象
res = getattr(obj,"weight")
print(res)
# 如果获取的值不存在,可以设置第三个参数,防止报错
res = getattr(obj,"weight123","抱歉这个值不存在")
print(res)
# 方法
# 通过类进行反射 (反射出来的是普通方法)
func = getattr(Children,"drink")
print(func) # <class 'function'>
func(1)
# 通过对象进行反射 (反射出来的是绑定方法) 自动传参了
func = getattr(obj,"drink")
print(func) # <bound method Children.drink of <__main__.Children object at 0x000001394205B550>>
func()
setattr
# 设置对象/类成员的值
# 属性或方法
class Father():
pass
class Mother():
pass
class Children(Father, Mother):
eye = "蓝色的"
weight = "1吨"
def eat(self):
print("小孩下生会喝奶")
def drink(self):
print("小孩下生喜欢喝勇闯天涯...")
def __la(self):
print("小孩自动啦,无法控制")
obj = Children()
# 对象
setattr(obj, "skin", "黑人")
print(obj.skin) # 黑人
# 类
setattr(Children, "skin", "土耳其人")
print(Children.skin) # 土耳其人
print(obj.skin) # 黑人
delattr
# 设置对象/类成员的值
# 属性或方法
class Father():
pass
class Mother():
pass
class Children(Father, Mother):
eye = "蓝色的"
weight = "1吨"
def eat(self):
print("小孩下生会喝奶")
def drink(self):
print("小孩下生喜欢喝勇闯天涯...")
def __la(self):
print("小孩自动啦,无法控制")
obj = Children()
# 对象
delattr(obj,"skin")
print(obj.skin)
# 类
delattr(Children,"skin")
print(Children.skin)
Reflect反射的使用
# 当前文件作为模块有一些方法
def func1():
print("我是func1方法")
def func2():
print("我是func2方法")
def func3():
print("我是func3方法")
import sys
print(sys.modules) # 系统字典 系统引用的模块 key 模块名 value obj
module = sys.modules["__main__"]
print(module,type(module)) # <module '__main__' from 'C:\\Users\\wbcde\\Desktop\\test\\main.py'> <class 'module'>
res = getattr(module, "func1")
print(res) # 普通函数 <function func1 at 0x000001AF1203E310>
while True:
strvar = input("请输入你想要使用的功能:")
if hasattr(module,strvar):
func = getattr(module,strvar)
func()
elif strvar.upper() == "Q":
print("再见")
break
else:
print("没有该成员~!")