例1：
'''
编写登录接口：
1.输入用户名和密码登录
2.输错三次锁定账户
3.下次登录还是上次的账户，提示锁定，直接退出（用到文件读写）
4.成功 后显示登录成功
'''
lock = "E:/Python_learn/day1/lock"
account = "E:/Python_learn/day1/account"
count = 0
flag = 1
lock_user = []
f1 = open(lock,'r')
lock_file = f1.readlines()
f1.close()
for i in lock_file:
i = i.strip('\n')
lock_user.append(i)
f2 = open(account,'r')
account_file = f2.readlines()
f2.close()
while True:
name = input("input your name:")
passwd = input("input your password:")
if name in lock_user:
print("user is lock!")
break
else:
count += 1
if count > 2:
print("错误三次")
with open(lock,'a') as f:
f.write("\n" + name)
break
else:
for i in account_file:
n1,p1 = i.strip().split()
if name == n1 and passwd == p1:
print("welcome login!!")
flag = True
else:
continue
if flag is True:
break
例2：
lock = "E:/Python_learn/day1/lock"
account = "E:/Python_learn/day1/account"
count = 0
flag = 1
lock_user = []
f1 = open(lock,'r')
lock_file = f1.readlines()
f1.close()
for i in lock_file:
i = i.strip('\n')
lock_user.append(i)
f2 = open(account,'r')
account_file = f2.readlines()
f2.close()
while True:
name = input("input your name:")
passwd = input("input your password:")
if name in lock_user:
print("user is lock!")
break
else:
count += 1
for i in account_file:
n1, p1 = i.strip().split()
if name == n1 and passwd == p1:
print("welcome login!!")
flag = True
else:
continue
if flag is True:
break
else:
if count > 2:
print("错误三次")
with open(lock,'a') as f:
f.write("\n" + name)
break
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