python學習第一課

標籤：amp   實現   span   dict   帳號密碼   +=   一課   break   style   

第一步，實現 輸入帳號密碼，顯示帳號歡迎：

username = input("username :")password = int(input("password :"))print("welcome  ",username,"!!!!!!!!!")

第二步，判斷帳號密碼是否正確：

userlist1=["a",123]username = input("username :")password = int(input("password :"))if (username == userlist1[0]) & (password==userlist1[1]):    print("welcome  ",username,"!!!!!!!!!")else:print("erro")

第三步，利用表，判斷帳號是否存在，且密碼正確：

dict = {‘a‘: 123, ‘b‘: 234};username = str(input("username :"))password = int(input("password :"))if (dict.__contains__(username)) & (password == dict.get(username)):    print("welcome  ", username, "!!!!!!!!!")else:    print("erro")

第四步，限制只能輸入三次：

dict = {‘a‘: 123, ‘b‘: 234};count=0while count<3 :    username = input("username :")    password = int(input("password :"))    if (dict.__contains__(username)) & (password == dict.get(username)):        print("welcome  ",username,"!!!!!!!!!")        break    else:        print("您已輸入錯誤",count+1,"次，輸入錯誤3次鎖定")        count += 1

第五步，限制同一帳號，只能輸入錯誤3次，超出退出程式：

dict = {‘a‘: 123, ‘b‘: 234};count=0errolist=[]while count<3 :    username = str(input("username :"))    errolist.append(username)    password = int(input("password :"))    if ( dict.__contains__( username) ) & (password==dict.get(username)):        print("welcome  ",username,"!!!!!!!!!")        break    else:        print("您已輸入錯誤",errolist.count(username),"次，輸入錯誤3次鎖定")        count = errolist.count(username)

 第六步：限制同一帳號，只能輸入錯誤3次，限制所有錯誤5次，超出退出程式：

dict = {‘a‘: 123, ‘b‘: 234,‘c‘:456};count=0errolist=[]blacklist=[]while count<5 :    username = str(input("username :"))    errolist.append(username)    password = int(input("password :"))    if (blacklist.count(username)<3):        if ( dict.__contains__( username) ) & (password==dict.get(username)):            print("welcome  ",username,"!!!!!!!!!")            break        else:            print("您已輸入錯誤",errolist.count(username),"次，輸入錯誤3次鎖定")            blacklist.append(username)            count +=1            print(count)            if (count == 5) :                print("您嘗試錯誤5次，程式將退出")                break    else:print("您已輸入錯誤3次鎖定")

 

python學習第一課