1 class Student():
2     name = ‘lemon‘
3 
4 print(Student.__dict__)
5 print(Student.name)
6 Student.name = ‘lemon-Xu‘
7 print(Student.name)

• Class.__dict__:返回類相關信息
• Class.name:設置或返回屬性

 1 class Student():
 2     name = ‘lemon‘
 3 
 4     def say(self,name):
 5         self.name = name
 
 6         print(self.name)
 7 
 8 
 9 a = Student()
10 
11 a.say(‘lemon-Xu‘)
12 
13 Student.say(Student,‘lemon-X‘)

• 類函數第一個參數必須傳入一個對象
• 當實例化對象調用時傳入自身.如果類對象調用時必須手動傳入類對象

 1 class Student():
 2     name = ‘lemon‘
 3 
 4     def __init__(self,name):
 5         self.name = name
 6 
 7 
 8 a = Student(‘
 
lemon-Xu‘)
 9 b = Student(‘lemon-a‘)
10 
11 print(a.__dict__)
12 print(b.__dict__)
13 print(Student.__dict__)

• __init__(self),建議只寫一個,重載請參考:https://www.cnblogs.com/erbaodabao0611/p/7490439.html

 1 class Student():
 2     __name = ‘lemon‘
 3 
 4     def __init__(self,name):
 5         self.__name
 
 = name
 6 a = Student(‘lemon-X‘)
 7 try:
 8     print(a.name)
 9 except :
10     print(‘雙下滑線的變量名被更名,所以找不到它,它被改名為_Class__attribute‘)
11 print(a._Student__name)
12 
13 print(Student._Student__name)

• 被__(雙下劃線)修飾的屬性,會被更名為_Class__attribute

Python面向對象-學習筆記