先注册，再登录（简易版）

先注册，将用户名和密码写入文件，然后三次机会登录，将文件中的信息读出与输入的信息比较

#换行符

#s.strip() 除去字符串两端的空格或换行符

username = input(请输入你要注册的用户名：)
password = input(请输入你要注册的密码：)
with open(list_of_info,mode=w,encoding=utf-8) as f:
    f.write({}
{}.format(username,password))
print(恭喜您，注册成功)
lis = []
i = 0
while i < 3:
    usn = input(请输入你的用户名：)
    pwd = input(请输入你的密码：)
    with open(list_of_info,mode=r+,encoding=utf-8) as f1:
        for line in f1:
            lis.append(line)
    if usn == lis[0].strip() and pwd == lis[1].strip():
        print(登录成功)
        break
    else:print(账号和密码错误)
    i+=1

username = input(请输入你要注册的用户名：) password = input(请输入你要注册的密码：) with open(list_of_info,mode=w,encoding=utf-8) as f: f.write({} {}.format(username,password)) print(恭喜您，注册成功) lis = [] i = 0 while i < 3: usn = input(请输入你的用户名：) pwd = input(请输入你的密码：) with open(list_of_info,mode=r+,encoding=utf-8) as f1: for line in f1: lis.append(line) if usn == lis[0].strip() and pwd == lis[1].strip(): print(登录成功) break else:print(账号和密码错误) i+=1

先注册，将用户名和密码写入文件，然后三次机会登录，将文件中的信息读出与输入的信息比较 #换行符 #s.strip() 除去字符串两端的空格或换行符 username = input(请输入你要注册的用户名：) password = input(请输入你要注册的密码：) with open(list_of_info,mode=w,encoding=utf-8) as f: f.write({} {}.format(username,password)) print(恭喜您，注册成功) lis = [] i = 0 while i < 3: usn = input(请输入你的用户名：) pwd = input(请输入你的密码：) with open(list_of_info,mode=r+,encoding=utf-8) as f1: for line in f1: lis.append(line) if usn == lis[0].strip() and pwd == lis[1].strip(): print(登录成功) break else:print(账号和密码错误) i+=1