Built-in function, the process-oriented programming

Built-in functions

• bytes () decodes characters

• chr () / ord () chr () refer to a digital ASCII code table converted into a corresponding character; the ord () converts characters into a corresponding digital

• divmod () columns

• enumerate () iteration with indexes

• eval () translates into a string data type

• hash () whether the hash

1. ABS () absolute value
2. all () within iterables elements are all true, then returns true
3. any () iterables there is an element is true, True
4. bin () / oct () / hex () binary, octal, hexadecimal conversion
5. dir () functions include all the time
6. frozenset () set immutable
7. globals () / loacals () to check the global names; see local name
8. POW () introduced into the module string
9. round()
10. slice()
11. sum()
12. import()

Process-oriented programming

Pros: complex processes of the problem, and then simplify

Disadvantages: poor scalability

Registration function

• Accept user input a user name, validity check, get a legitimate user name

  def check_username():
    username=input('username:').strip()
    if username.isalpha():
        return username
    else:
        print('必须为字母')

  Enter the password, the legality verification, to get a legitimate password

  def check_pwd():
      while True:
          pwd = input('password>>>').strip()
          if len(pwd) < 5:
              print('密码长度至少五位')
              continue
          re_pwd = input('re_password>>>').strip()
          if pwd == re_pwd:
              return pwd
          else:
              print('两次输入密码不一致')

  The valid user name and password are written to the file

  def insert(username, pwd, path='57.txt'):
      with open(path, 'a', encoding='utf8') as fa:
          fa.write(f'{username}:{pwd}\n')

  registered

  def register():
      username = check_username()
      pwd = check_pwd()
      insert(username, pwd)
      print(f'{username}注册成功')
  
  
  register()

Stratified realize the function

• User functional layers: User specific functions implemented.
• Interface Layer: connecting the user and the data processing layer functional layer.
• Layer Data Processing: The data processing results to the Interface Layer.

Realize the benefits of layered function: When the end we need to implement web and app software side, we just put data processing layer and the interface layer written, then realize different functional layers to the user, web-side end users using a web functional layer, app end end user using the app functional layer, but the interface layer and the data processing layer are common.