标签：python
实现一个用户登陆的小程序，如果密码错误，可以重试三次，如果三次均错误，则锁定
数据库如下格式，分别用户名|密码|锁定，其中锁定字段0为正常，1为被锁定
root|admin123|0 admin|admin123|1 Cevin|admin123|0
代码如下
username = input("please input your username:")
file_db = open(‘db‘,‘r‘,encoding=‘utf-8‘)
file = open(‘db‘,‘r‘,encoding=‘utf-8‘)
test_list = []for line in file:
f = line.strip().split(‘|‘)
test_list.append(f[0])
file.close()if username in test_list: for line in file_db:
list_db = line.strip().split(‘|‘) if list_db[0] == username and list_db[2] == ‘0‘:
password = input("please input your password:") if list_db[1] == password: print(‘welcome %s login.‘ %(username)) break
else: print("password is error") for i in range(4): if i == 3: print("%s is already locked" % (username))
file_db = open(‘db‘,‘r‘,encoding=‘utf-8‘)
file_new_db = open(‘new-db‘,‘w‘,encoding=‘utf-8‘) for line in file_db: if username in line:
test_list = line.strip().split(‘|‘)
file_new_db.write(test_list[0]+ ‘|‘ + test_list[1] +‘|‘ + ‘1‘ + ‘\n‘) else:
file_new_db.write(line)
file_new_db.close()
file_db.close() break
else:
option = input("do you want do to tyr?") if option == ‘no‘: print("ByeBye") break
else:
password = input("please input your password:") if list_db[1] == password: print("yes,you have already login success!") break
else: print("password is error") elif list_db[0] == username and list_db[2] == ‘1‘: print("%s is already locked" %(username)) break
else: passelse: print("%s is not register" %(username))本文出自 “百年民国” 博客，请务必保留此出处http://bainianminguo.blog.51cto.com/4572772/1944997
标签：python
原文地址：http://bainianminguo.blog.51cto.com/4572772/1944997
