python 中的文本文件讀寫問題

Question

我正在嘗試接受輸入並將輸入寫入文本文件以保存它。 但是，我似乎無法將用戶輸入寫入文本文件。 這是我的代碼：

SaveUsername = open(r"C:\Users\Ty\Desktop\Login_sys\SaveUsername.txt","w+")
SavePassword = open(r"C:\Users\Ty\Desktop\Login_sys\SavePassword.txt","w+")
NewUsername = input("Please enter a username: ")
NewPassword = input("Please enter a password: ")
SaveUsername.write(NewUsername)
print (SaveUsername.readline())
SavePassword.write(NewPassword)
print (SavePassword.readline())

我正在打印 readline 以查看代碼是否被寫入並且它永遠不會。 請幫忙，謝謝。

Answer 1

首先，您應該在寫入文件后關閉文件，然后再讀取更改。 您還應該使用with open(...) ，因為它是一種更好的做法（出於多種原因）。 這是您應該使用的代碼：

with open(r"C:\Users\Ty\Desktop\Login_sys\SaveUsername.txt", "w") as SaveUsername:
    NewUsername = input("Please enter a username: ")
    SaveUsername.write(NewUsername)

with open(r"C:\Users\Ty\Desktop\Login_sys\SavePassword.txt", "w") as SavePassword:
    NewPassword = input("Please enter a password: ")
    SavePassword.write(NewPassword)

with open(r"C:\Users\Ty\Desktop\Login_sys\SaveUsername.txt", "r") as SaveUsername:
    print(SavePassword.readline())

with open(r"C:\Users\Ty\Desktop\Login_sys\SavePassword.txt", "r") as SavePassword:
    print(SavePassword.readline())

Answer 2

在閱讀之前關閉文件並打開閱讀。

Answer 3

嘗試這個

with open(r"SaveUsername.txt","w+") as SaveUsername:
    NewUsername = input("Please enter a username: ")
    SaveUsername.write(NewUsername)

with open(r"SavePassword.txt","w+") as SavePassword:
    NewPassword = input("Please enter a password: ")
    SavePassword.write(NewPassword)


with open(r"SaveUsername.txt" as SaveUsername:
    print (SaveUsername.readline())

with open(r"SavePassword.txt") as SavePassword:
    print (SavePassword.readline())