Question

我正在尝试创建一个Tkinter登录Gui但是如果我单击登录它会显示消息“TypeError：描述符'readlines'的'文件'对象需要参数”我尝试寻找答案，其中大多数是因为区分大小写的错误。请有人帮帮我。我已经正确设置了profile.txt文件（我100％肯定）

def LogIn():
    name=input("Please enter your name: ")
    file = open(name.lower() + "profile.txt", "r")
import Tkinter
import time
window = Tkinter.Tk()
window.title("Python Games Login")
window.geometry("270x210")
window.configure(bg="#39d972")

def callback():
    line = file.readlines()
    username = user.get()
    password = passw.get()
    if username == line[1] and password == line[2]:
            message.configure(text = "Logged in.")
    else:
        message.configure(text = "Username and password don't match the      account \n under the name;\n \'" + name + "\'. \nPlease try again.")

title1 = Tkinter.Label(window, text="--Log in to play the Python Games--  \n",   bg="#39d972")
usertitle = Tkinter.Label(window, text="---Username---", bg="#39d972")
passtitle = Tkinter.Label(window, text="---Password---", bg="#39d972")
message = Tkinter.Label(window, bg="#39d972")
user = Tkinter.Entry(window)
passw = Tkinter.Entry(window, show='*')
go = Tkinter.Button(window, text="Log in!", command = callback, bg="#93ff00")
title1.pack()
usertitle.pack()
user.pack()
passtitle.pack()
passw.pack()
go.pack()
message.pack()
window.mainloop()

Answer 1

你的问题是你在函数中分配给file并且它没有传播到全局变量，因此在函数callback中它不是你所期望的。

file它（在评论中暗示）内置python类型，因此您会收到此类错误，而不是NameError，因为它将是未定义的变量。

请检查示例this question以更好地了解变量作用域在python中的工作方式。

TypeError：'file'对象的描述符'readlines'需要参数

1 个答案: