python實(shí)現(xiàn)二級(jí)登陸菜單及安裝過程

"""
 1.三級(jí)菜單 注冊(cè) 登陸 注銷
 2.進(jìn)入每一個(gè)一級(jí)菜單，都會(huì)有下一級(jí)的菜單
"""
user_item = dict()
try:
  while True:
    print('-------Welcome sir-------')
    input_choice = int(input('Please enter your choice:1:Registration 2:login 3:logout:'))
    # 用戶輸入自己的選擇，會(huì)進(jìn)入到相關(guān)的二級(jí)菜單
    if input_choice == 1:
      # if input_choice==1 進(jìn)入注冊(cè)
      user = input('Please enter your account number:')
      pwd = input('please enter your password:')
      # 保存用戶注冊(cè)的賬號(hào)
      user_item['user'] = user
      user_item['pwd'] = pwd
      # 提示用戶注冊(cè)成功
      print('您的賬號(hào)已生效，下次請(qǐng)用該賬號(hào):{}登陸本系統(tǒng)'.format(user))
    # if input_choice==2 進(jìn)入登陸
    elif input_choice == 2:
      login_user = input('Please enter your login account number:')
      login_pwd = input('please enter your login password:')
      # 對(duì)用戶輸入的賬號(hào)和密碼進(jìn)行確認(rèn)
      if login_user == user_item['user'] and login_pwd == user_item['pwd']:
        print('Welcome sir:{}'.format(login_user))
      else:
        print('Sorry, your account or password is incorrect. Please confirm and come back')
    # if input_choice == 3 進(jìn)入注銷
    elif input_choice == 3:
      logout_input = input('Do you really want to quit this system?,y or n')
      if logout_input == 'y':
        break
      elif logout_input == 'n':
        input_choice = int(input('Please enter your choice:1:Registration 2:login 3:logout:'))
      else:
        print('Your input is incorrect')
except Exception as re:
  print(re)
finally:
  print('')