#!/usr/bin/env python
import sys
name = ''
pw=''
name_num = 0
pw_num = 0
#black_list = []
with open('a.txt','r') as f:
    for i in f.xreadlines():
        namelist.append(i.split()[0])
        pwlist.append(i.split()[1])

def name_test(input_name, namelist):
    if input_name in namelist:
        return True
    else:
        return False

name = raw_input('Please input your name:')
name_num +=1
while True:
    if name_test(name, namelist):
   break
    else:
   if name_num < 3:
           name = raw_input('Name is error,Please input your name again:')
      name_num += 1
   else:
      print 'Sorry,Today you have mistyped user name three times'
      sys.exit()

pw = raw_input('Please input your password:')
pw_num +=1
while True:
    index_pw = pwlist[namelist.index(name)]
    if pw == index_pw:
        print 'welcome'
        break
    else:
   if pw_num < 3:
           pw = raw_input('Passwd is error,Please input your passwd again:')
           pw_num +=1
   else:
      print 'Sorry,Today you have to lose the wrong password three times'
      sys.exit()

这里的a.txt的格式是

bao 123
zhang 456

后面还要加入黑名单的一些小程序

这里还有一个朋友给我的程序，感觉他的更加的简练，看着舒服：

#!/usr/bin/env python 
# -*- coding: utf-8 -*-
# @Time    : 2016/7/29 11:46
# @Author  : Big_Bao
import sys
def name_test(input_name, namelist):
    if input_name in namelist:
        return True
    else:
        print 'Name is None.'
        return False

def pw_test(pw ,index_pw, innerloopnumber=0):
    if pw == index_pw:
        print 'Welcome.'
        inn = innerloopnumber+1
        return inn
    else:
        print 'Password is None.'

namelist = []
pwlist = []
with open('a.txt','r') as f:
    for i in f.xreadlines():
        namelist.append(i.split()[0])
        pwlist.append(i.split()[1])

index_pw = []
name = ''
pw=''
name_num = 0
pw_num = 0
inloopnum = 0

name = raw_input('Please input your name:')
name_num +=1
while True:
    if name_test(name, namelist):
        index_pw = pwlist[namelist.index(name)]
        pw = raw_input('Please input your password:')
        pw_num +=1
        inloopnum_ = pw_test(pw, index_pw,innerloopnumber=inloopnum)
    else:
        name = raw_input('Please input your name again:')
        name_num +=1

    if name_num ==3:
        print 'You have no chance.'
        sys.exit()
    if pw_num==3:
        print 'You have no chance'
        sys.exit()
    if inloopnum_==1:
        sys.exit()

感谢这位远在成都的朋友平时的指点

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