name = input("請註冊用戶：")
password = input("請註冊密碼：")
with open(file="user", mode=‘w‘, encoding=‘utf-8‘) as f:
    f.write(‘{}\n{}‘.format(name, password))　　　　# 將用戶、密碼寫入文件
print("恭喜%s，註冊成功！" % name)
count = 0
li = []
while count < 3:　　# 三次輸入機會
    _name = input("請輸入用戶：")
    _password = input("
 
請輸入密碼:")
    with open(file=‘user‘, mode=‘r+‘, encoding=‘utf-8‘) as f:　　# 讀取文件
        for line in f:
            #li.append(line)
        if li[0].strip() == _name and li[1].strip() == _password:
            print("登錄成功！")
            break
        else:
            print("請重新輸入！")
        
 
if count == 2:
            print("笨蛋，回家養豬去吧！！！！！")
        count += 1

# 改良
name = input("請註冊用戶：")
password = input("請註冊密碼：")
with open(file="{}".format(name), mode=‘w‘, encoding=‘utf-8‘) as f:
    f.write(‘{}\n{}‘.format(name, password))
print("恭喜%s，註冊成功！" % name)
count = 0
# li = []
while
 
 count < 3:
    _name = input("請輸入用戶：")
    _password = input("請輸入密碼:")
    with open(file="{}".format(name), mode=‘r+‘, encoding=‘utf-8‘) as f:
        # for line in f:
        #     li.append(line)
        li = f.readlines()
        if li[0].strip() == _name and li[1].strip() == _password:
            print("登錄成功！")
            break
        else:
            print("請重新輸入！")
        if count == 2:
            print("笨蛋，回家養豬去吧！！！！！")
        count += 1

過程

1）用戶交互-註冊用戶、密碼

2）寫入文件

3）while循環，3次機會

4）用戶交互-輸入用戶、密碼

5）讀文件

6）str比較

08->python3註冊登錄(文件操作)