3.1 面向对象的基本知识

 1 import json
 2 import re
 3 def interactive():
 4     name=input(‘>>: ‘).strip()
 5     pwd=input(‘>>: ‘).strip()
 6     email=input(‘>> ‘).strip()
 7     return {
 8         ‘name‘:name,
 9         ‘pwd‘:pwd,
10         ‘email‘:email
11     }
12 
13 def check(user_info):
14     is_valid=True
15 
16     if len(user_info[‘name‘]) == 0:
17         print(‘用户名不能为空‘)
18         is_valid=False
19 
20     if len(user_info[‘pwd‘]) < 6:
21         print(‘密码不能少于6位‘)
22         is_valid=False
23 
24     if not re.search(r‘@.*?\.com$‘,user_info[‘email‘]):
25         print(‘邮箱格式不合法‘)
26         is_valid=False
27 
28     return {
29         ‘is_valid‘:is_valid,
30         ‘user_info‘:user_info
31     }
32 
33 def register(check_info):
34     if check_info[‘is_valid‘]:
35         with open(‘db.json‘,‘w‘,encoding=‘utf-8‘) as f:
36             json.dump(check_info[‘user_info‘],f)
37 
38 
39 
40 def main():
41     user_info=interactive()
42 
43     check_info=check(user_info)
44 
45     register(check_info)
46 
47 if __name__ == ‘__main__‘:
48     main()

 1 # 先定义类
 2 class LuffyStudent:
 3     # 数据属性
 4     school = ‘luffycity‘
 5 
 6     # 函数属性
 7     def learn(self):
 8         print(‘is learning‘)
 9 
10     # 函数属性
11     def eat(self):
12         print(‘is eating‘)
13 
14 
15 #后产生对象
16 stu1 = LuffyStudent()
17 
18 #查看类的名称空间
19 print(LuffyStudent.__dict__)
20 print(LuffyStudent.__dict__[‘school‘])
21 
22 # 查看类的属性
23 print(LuffyStudent.school)  #等价于print(LuffyStudent.__dict__[‘school‘])
24 
25 # 增加类的属性
26 LuffyStudent.country = ‘china‘
27 #print(LuffyStudent.__dict__)
28 print(LuffyStudent.country)
29 
30 # 删除类的属性
31 del LuffyStudent.country
32 
33 # 改类的属性
34 LuffyStudent.school = ‘Luffycity‘

 1 class LuffyStudent:
 2     school=‘luffycity‘
 3 
 4     #            stu1, ‘王二丫‘, ‘女‘, 18
 5     def __init__(self,name,sex,age):
 6         self.Name=name
 7         self.Sex=sex
 8         self.Age=age
 9 
10         #stu1.Name=‘王二丫‘
11         #stu1.Sex=‘女‘
12         #stu1.Age=18
13 
14     def learn(self):
15         print(‘is learning‘)
16 
17     def eat(self):
18         print(‘is sleeping‘)
19 
20 
21 #后产生对象
22 stu1=LuffyStudent(‘王二丫‘,‘女‘,18) #LuffyStudent.__init__(stu1,‘王二丫‘,‘女‘,18)
23 
24 #加上__init__方法后，实例化的步骤
25 # 1、先产生一个空对象stu1
26 # 2、LuffyStudent.__init__(stu1,‘王二丫‘,‘女‘,18)
27 
28 
29 #查
30 print(stu1.__dict__)
31 print(stu1.Name)
32 print(stu1.Sex)
33 print(stu1.Age)
34 
35 # 改
36 stu1.Name=‘李二丫‘
37 print(stu1.__dict__)
38 print(stu1.Name)
39 
40 
41 # 删除
42 del stu1.Name
43 print(stu1.__dict__)
44 
45 #增
46 stu1.class_name=‘python开发‘
47 print(stu1.__dict__)
48 
49 
50 stu2=LuffyStudent(‘李三炮‘,‘男‘,38) #Luffycity.__init__(stu2,‘李三炮‘,‘男‘,38)
51 print(stu2.__dict__)
52 print(stu2.Name)
53 print(stu2.Age)
54 print(stu2.Sex)