Tkinter 按钮回调缺少它包含的参数

Question

我试图制作一个接受用户提供的用户名和密码然后加载该文档的程序，我遇到了一个奇怪的错误 load_user() missing 1 required positional argument: 'username' 但它已被用户传递。我将在下面包含完整的代码，但问题可能在于未完成的加载功能，我认为：

def load_user(self,username):
    print("...")
    jj = open("data_"+str(username)+".txt","r")
    lines = jj.readlines()
    user = str(lines[2])
    passw = str(lines[4])
    print("...")
    if password == passw:
        print("Loaded save of "+user)

就像我说的，class 的整个正文都包含在下面，以防它在另一个区域出现问题。

感谢所有帮助，谢谢！

编辑： 澄清一下，我需要在按下按钮时执行命令，因此传递 self.load_user(...) 不起作用，因为它在 Tkinter 打开时执行。

from tkinter import *
get = 0

class Menu_F:
    def __init__(self,master):

        frame = Frame(master)
        frame.grid()

        title_username = Label(master, text="User Name")
        title_username.grid(row=0, column=0)

        title_password = Label(master, text="Password")
        title_password.grid(row=1, column=0)

        global username
        username = Entry(master, bd=5)
        username.grid(row=0, column=1)

        global password
        password = Entry(master, bd=5, show="*")
        password.grid(row=1, column=1)

        load_game = Button(master, text="Load Game",
                           fg="black",command=self.load_user)
        load_game.grid(row=3, column=1)

        new_game = Button(master, text="New Game",
                          fg="black",command=self.new_user)
        new_game.grid(row=3, column=0)

        confirm_username = Button(master, text="Done",
                                  fg="black",command=self.get_username)
        confirm_username.grid(row=0, column=2)

        confirm_password = Button(master, text="Done",
                                  fg="black",command=self.get_password)
        confirm_password.grid(row=1, column=2)

    def get_username(self):
        get = 1
        global username
        username = username.get()
        print("Username is: "+username)

    def get_password(self):
        global password
        password = password.get()
        print("Password is: "+password)

    def load_user(self,username):
        print("...")
        jj = open("data_"+str(username)+".txt","r")
        lines = jj.readlines()
        user = str(lines[2])
        passw = str(lines[4])
        print("...")
        if password == passw:
            print("Loaded save of "+user)

    def save_user(self,username,password,progress):
        ss = open("data_"+str(username)+".txt","w")
        ss.write("""_-_-_
-_-_-
"""+str(username)+"""
_-_-_
"""+str(password)+"""
-_-_-
"""+int(progress))

    def new_user(self,username,password):
        nn = open("data_"+str(username)+".txt","w")
        nn.write("""_-_-_
-_-_-
"""+str(username)+"""
_-_-_
"""+str(password)+"""
-_-_-
0""")

root = Tk()
root.resizable(width=FALSE, height=FALSE)
app = Menu_F(root)
mainloop()

Answer 1

 command=self.load_user

是你的回调，但你没有向函数传递任何参数，即使它需要一个。

Answer 2

该函数实际上并没有被用户传递用户名。您的以下代码：

load_game = Button(master, text="Load Game",
                   fg="black",command=self.load_user)

基本上调用 self.load_user() - 没有参数 - 当 load_game 按钮被点击时。您可以通过两种方式解决此问题：

将 command 转换为 lambda 函数：

load_game = Button(master, text="Load Game",
                   fg="black",command=lambda: self.load_user(username.get()))

消除函数的 username 参数并简单地让它访问该全局变量：

def load_user(self):
        print("...")
        global username
        jj = open("data_"+str(username.get())+".txt","r")
        ...

Tkinter 按钮回调缺少它包含的参数

Tkinter button callback missing an argument that it contains

python

tkinter

loading

typeerror