用Python写一段用户登录的程序代码
如下所示：
#!/usr/bin/env python
#coding: utf8
import getpass
db = {}
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)uit
input 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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