用Python写一段用户登录的程序代码

如下所示：

#!/usr/bin/env python#coding: utf8import getpassdb = {}def newUser(): username = raw_input('username: ') if username in db: #添加打印颜色 print "/033[32;1m%s already exists![0m" % username else: #屏幕不显示密码，调用getpass.getpass() password = getpass.getpass() db[username] = password #字典k-v赋值def oldUser(): username = raw_input('username: ') password = getpass.getpass() if username in db: if db.get(username) == password:#判断输入的用户名和密码是否和字典的k-v匹配  print '/033[32;1mlogin successful!/033[0m' else:  print '/033[32;1mpassword not match username/033[0m' else: print '/033[32;1musername does not exist/033[0m'CMDs = {'n':newUser,'o':oldUser}def showMenu(): prompt = """(N)ew user(O)ld user(Q)uitinput your choice: """ while True: try:#捕获ctrl+c ctrl+d的异常  choice = raw_input(prompt).strip().lower()[0] except (KeyboardInterrupt, EOFError):  choice = 'q' if choice not in 'noq':  continue if choice == 'q':  break CMDs[choice]()#这种方法相当于shell和c里面的case，很实用if __name__ == '__main__': showMenu()

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