python蟒蛇登录验证

今天有时间，写了一个登录验证的程序。

遇到一点问题，但影响不大

account_file = 'TEST1.txt'#存储用户名密码的文件
lock_file = 'TEST2.txt'#存储输入用户名密码超过3次的
import os
                    
f=open(account_file)
ac=f.readlines()
f.close()
print(ac)
while True:#循环3次机会
    f=open(lock_file)
    locklist=[]
    for i in f.readlines():
        i.strip('\n')
        locklist.append(i)
        f.close() 
        username = input("username：").strip()#请输入用户名
    
        if username in locklist:
            print('sorry,three times')
            break
        else:   
            for line in ac:
                line=line.split()
                if line[0] == username:
                    lock=False
                    for i in range(3):
                        psw=input('password：').strip()
                        if psw == line[1]:
                            lock=True
                            print('welcom{username}login my system!')
                            break
                        else:
                            f=open(lock_file,'w')
                            f.write('%s\n'%username)
                            f.close()
else:
    print("wrong password!")

注册实现

while True:     
    name = input('What is your name?').strip()
    if len(name) == 0:
        continue
    else:
        break
        
a=[]      
age = input('What is your age?')#类型转换
sex = input('What is syour sex?').strip() 
job = input('What is your job?')
a=age
#a.append(age)
set(a)
print(a)

print("Your name is %s , it's a good name." % name) 

这里的#a.append(age)
出现点问题，希望有能力的大佬讲解一下