Python、Tkinter - 未定義根

Question

我有一個 class - 下面的代碼 - 從if __name__ == '__main__':但是當我從 another.py 文件調用它時它會吐出一個錯誤。 抱歉，如果這是我的一個基本錯誤，但我嘗試了很多東西，但似乎沒有任何效果，真的很想得到一些幫助！

錯誤：

File "c:\Users\...\test.py", line 6, in <module>       
    app = Screenshot(root)
  File "c:\Users\...\Screenshot.py", line 18, in __init__
    self.master_screen = Toplevel(root)
NameError: name 'root' is not defined

Class：

import time
from tkinter import Toplevel, Canvas, Frame, BOTH, YES, Tk
import pyautogui
import datetime

class Screenshot():
    
    def __init__(self, master):
        self.master = master
        self.rect = None
        self.x = self.y = 0
        self.start_x = None
        self.start_y = None
        self.curX = None
        self.curY = None
        
        self.master_screen = Toplevel(root)
        self.master_screen.title("Fenify")
        self.master_screen.attributes("-transparent", "blue")
        self.picture_frame = Frame(self.master_screen)
        self.picture_frame.pack(fill=BOTH, expand=YES)
        self.createScreenCanvas()

    #TakeScreenshot
    def takeBoundedScreenShot(self, x1, y1, x2, y2):
        ...
    #Window
    def createScreenCanvas(self):
        ...
    #Controls
    def on_button_press(self, event):
        ...

    def on_button_release(self, event):
        ...
    def on_right_click(self, event):
        ...
    def on_move_press(self, event):
        ...
    #Exit
    def exit_screenshot(self):
        ...

if __name__ == '__main__':
    root = Tk()
    app = Screenshot(root)
    root.mainloop()

從另一個 class 調用的示例：

import tkinter
from Screenshot import Screenshot


root = tkinter.Tk()
app = Screenshot(root)
root.mainloop()

Answer 1

您想將Toplevel的父級/主控設置為self.master而不是root 。 root未在Screenshot class 的 scope 中定義，但輸入參數master確實指向它。

self.master_screen = Toplevel(self.master)