python 简单的用户登陆
#!/usr/bin/env python#coding:utf-8
import hashlib
from datetime import datetime
ul = {}
def newuser():
a = []
prompt = "Please enter username again:"
while True:
name = raw_input(prompt).lower()
if not name.isalnum() and '' in name :
print('name format error')
continue
else :
if ul.has_key(name):
prompt = "username already exists"
continue
else:
break
passwd = raw_input('enter password:')
m=hashlib.md5()
m.update(passwd)
a.append(m.hexdigest())
a.append(datetime.now())
ul=a
print 'new user is %s ' \
'regiter time is %s' %(name,ul)
def olduser():
name= raw_input('Please enter username again:').lower()
passwd = raw_input('Please enter your password:')
m=hashlib.md5()
m.update(passwd)
pwd = ul.get(name)
if pwd==m.hexdigest():
newtime = datetime.now()
if (newtime-ul).days == 0 and (newtime-ul).seconds < 14400:
print 'you already logged in at %s: ' %(ul)
else:
pwd=newtime
print 'welcome back %s, login time is %s' %(name,passwd)
else:
print 'login incorrect'
def removeuser():
print ul
name=raw_input('input a user name to remove: ').lower()
if name in ul:
ul.pop(name)
print 'remove successful'
else:
print 'this uesr not exist'
def login():
while True:
name=raw_input('Please enter username:').lower()
if not name.isalnum() and '' in name:
print 'name format error'
continue
else:
if not ul.has_key(name):
print 'user name is not in userlist'
answer=raw_input('register a new user? (y/n):').lower()
if 'y'==answer:
newuser()
break
elif 'n'==answer:
break
else:
print 'user name is already in db'
olduser()
break
def showmenu():
prompt = """
(U)ser login
(R)emove user
(Q)uit
Enter choice: """
done = False
while not done:
chosen = False
while not chosen:
try:
choice = raw_input(prompt).strip().lower()
except (EOFError,KeyboardInterrupt):
choice= 'q'
print"\nYou picked [%s]" %choice
if choice not in 'urq':
print("invalid option,try again")
else :
chosen = True
if choice == 'q':done = True
if choice == 'u':login()
if choice == 'r':removeuser()
if __name__ == '__main__':
showmenu()
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