第一條，

第一條，

輸入密碼，成功後顯示歡迎，輸入三次鎖定，儲存錯誤

user_name = 'Hello world'
password = '321321'
url = 'D:\7z' #似乎沒用到
answer1 = input('請輸入使用者名稱\n')
answer2 = input('請輸入密碼\n')
if answer1 == user_name and answer2 == password:
    print('ok,welcome')
else :
    answer1 = input('agqin')
    answer2 = input('again')
    count = 2
    while count >0 :
        answer1 = input('agqin')
        answer2 = input('again')
        if answer2 !=password:
            count = count -1
            with open('D:\\7z\\a\\1.txt','w') as f:
                f.write('count = 0',)
                f.close()
        else:
            print('good,welcome')

變數全部大寫字母表示常量，例如π = 3.1415.....

1位=1bit

8bit = 1byte = 1位元組

cd../../..返回多層目錄