在python中读取和写入文本文件的问题

Question

我正在尝试获取输入并将输入写入文本文件以保存它。但是，我似乎无法将用户输入写入文本文件。这是我的代码：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 以查看代码是否被写入并且它从来没有。请帮助，谢谢。

Answer 1

尝试这个

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())

Answer 2

首先，您应该在写入文件后关闭文件，然后再读取更改。您还应该使用with open(...)它，因为它是一种更好的做法（出于多种原因）。这是您应该使用的代码：

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 3

在阅读之前关闭文件并打开以供阅读。