import sys

account_file = "user_file"
locked_file = "lock_file"

def deny_account(username):
    print("您的用户已经被锁定!")
    with open(locked_file,"a") as deny_f:
        deny_f.write("\n" + username)

def main():
    retry_count = 0
    retry_limit = 3
    while retry_count < retry_limit:
        username = input("\033[32:lm请输入用户名:\033[om")
        with open(locked_file,"r") as lock_f:
            #采用with的文件打开方式，防止忘记f.close()关闭文件
            """
            lines = []
            for line in lock_f.readlines():
                lines.append(line.strip())
            if username in lines:
            """
            for line in lock_f.readlines():
                if len(line) == 0:
                    continue
                if username == line.strip():
                    sys.exit("\033[32:lm用户 %s 已经被锁定！\033[0m" %username)

if __name__ == "__main__":
    main()