如何將循環添加到用戶名和密碼登錄（Python）？

Question

我是編程的初學者。 我正在嘗試制作一個程序，該程序將要求用戶創建一個帳戶，然后使用他們剛剛輸入的詳細信息登錄...這是我開始的內容，現在我有點卡住了，因為我也有語法第 16 行的錯誤：

from time import sleep

print ("Hey there! To enter the system you are required to sign in")
sleep(2.0)

while True:
    choose=input("If you have an account please type 'SIGN IN', if you do not have an account please type 'CREATE'. ")
    if choose=="SIGN IN":
        print ("You have chosen to sign into your account")
        break
    elif choose=="CREATE":
        print ("You have chosen to create an account")
        break
    username=input("Please enter a username: ")
    password=input("Please enter a memorable password: ")
    else:
        print ("Please enter a valid option, 'SIGN IN' or 'CREATE'")
        sleep(1.0)

所以任何幫助表示贊賞，我知道我有點愚蠢，我才剛剛開始。

Answer 1

我通過刪除“break”語句並縮進以下兩行來修復第 16 行的語法錯誤。

from time import sleep

print ("Hey there! To enter the system you are required to sign in")
sleep(2.0)

while True:
    choose=input("If you have an account please type 'SIGN IN', if you do not have an account please type 'CREATE'. ")
    if choose =="SIGN IN":
        print("You have chosen to sign into your account")
    if choose=="CREATE":
        print ("You have chosen to create an account")
        username=input("Please enter a username: ")
        password=input("Please enter a memorable password: ")
    else:
        print("Please enter a valid option, 'SIGN IN' or 'CREATE'")
        sleep(1.0)

Answer 2

from time import sleep

print ("Hey there! To enter the system you are required to sign in")
sleep(2.0)

while True:
    choose=input("If you have an account please type 'SIGN IN', if you do not have an account please type 'CREATE'. ")
    if choose=="SIGN IN":
        print ("You have chosen to sign into your account")
        break
    elif choose=="CREATE":
        print ("You have chosen to create an account")
        username=input("Please enter a username: ")
        password=input("Please enter a memorable password: ")
        break
    else:
        print ("Please enter a valid option, 'SIGN IN' or 'CREATE'")
        sleep(1.0)
while True:
    input_username = input("Please input a valid username:")
    input_password = input("Please input a valid password:")
    if input_username == username and input_password == password:
        print("Successful login!")
        break
    else:
        print("Either the username or the password is incorrect,please try again")

所以這就是你想要的它有兩個while循環第一個用於在兩個選項之間進行選擇，第二個將處理登錄憑據，如果錯誤，將重復登錄檢查無窮大。

PS：如果沒有用戶名或密碼變量會拋出錯誤

Answer 3

好的，多虧了@minorwannabedev，我已經設法解決了。 這是我的新代碼：

from time import sleep
login = False
username = False
password = False
print ("Hey there! To enter the system you are required to sign in")
sleep(2.0)

while True:
    if login == True:
        break
    choose=input("If you have an account please type 'SIGN-IN', if you do not have an account please type 'CREATE':\n")
    if choose=="CREATE":
        print ("You have chosen to create an account")
        username=input("Please create a username:\n")
        password=input("Please enter a memorable password:\n")
    
    elif choose =="SIGN-IN":
        print("You have chosen to sign into your account")
        while True:
            input_username = input("Please input a valid username:")
            input_password = input("Please input a valid password:")
            if input_username == username and input_password == password:
                print("Successful login")
                login = True
                break

            else:
                print("Either the username or the password is incorrect,please try again")
                break
    else:
        print("Please enter a valid option, 'SIGN IN' or 'CREATE'")
        sleep(1.0)

這花了我一點時間來解決，但現在可以了！