反射也叫路由系統，就是通過字符串的形式導入模塊；通過字符串的形式去模塊中尋找指定的函數，並執行，利用字符串的形式去對象（模塊）中操作（查找、獲取、刪除、添加）成員，一種基於字符串的時間驅動。

獲取：（getattr：獲取或執行對象中的對象）

 1 class NameList():
 2     def __init__(self,name,age):
 3         self.name = name
 4         self.age = age
 5 
 6     def Show(self):
 7         print("My name is %s and I‘m %d years old
 
" %(self.name,self.age))
 8 
 9 obj = NameList("Adair",18)
10 # obj.Show()
11 UserInput=input(">>>")
12 print(getattr(obj,UserInput))
13 
14 >>>name
15 Adair
16 
17 >>>age
18 18
19 
20 >>>Show
21 <bound method NameList.Show of <__main__.NameList object at 0x000001F6CADEB358>>

 1 getattr 調用函數：
 2 class NameList():
 3     def __init__(self,name,age):
 4         self.name = name
 5         self.age = age
 6 
 7     def Show(self):
 8         print("My name is %s and I‘m %d years old" %(self.name,self.age))
 9 
10 obj = NameList("Adair",18)
11 # obj.Show()
12
 
 UserInput=input(">>>")
13 Get = getattr(obj,UserInput)
14 Get()
15 
16 >>>Show
17 My name is Adair and I‘m 18 years old

查找：（hasattr:判斷方式是否存在與對象中）

 1 class NameList():
 2     def __init__(self,name,age):
 3         self.name = name
 4         self.age = age
 5 
 6     def Show(self):
 7         print("My name is %s and I‘m %d years old" %(self.name,self.age))
 8 
 9 obj = NameList("Adair",18)
10 UserInput=input(">>>")
11 print(hasattr(obj,UserInput))
12 
13 >>>name
14 True
15 
16 >>>Show
17 True
18 
19 >>>Adair
20 False

添加/修改（setattr）

class NameList():
    def __init__(self,name,age):
        self.name = name
        self.age = age

    def Show(self):
        print("My name is %s and I‘m %d years old" %(self.name,self.age))

obj = NameList("Adair",18)
InputKey=input(">>>")
InputValue=input(">>>")
New = setattr(obj,InputKey,InputValue)
print(getattr(obj,InputKey))

>>>salary
>>>100000
100000


>>>name
>>>xiaohei
xiaohei

刪除：（delattr）

 1 class NameList():
 2     def __init__(self,name,age):
 3         self.name = name
 4         self.age = age
 5 
 6     def Show(self):
 7         print("My name is %s and I‘m %d years old" %(self.name,self.age))
 8 
 9 obj = NameList("Adair",18)
10 UserInput=input(">>>")
11 delattr(obj,UserInput)
12 print(hasattr(obj,UserInput))
13 
14 >>>name
15 False

註：getattr,hasattr,setattr,delattr對模塊的修改都在內存中進行，並不會影響文件中真實內容。

python 反射機制