Python，Tkinter - 未定义根

Question

我有一个 class - 下面的代码 - 从 if __name__ == '__main__': 调用时它可以完美运行，但是当我从另一个 .py 文件调用它时它会报错。如果这是我的一个基本错误，我深表歉意，但我尝试了很多东西，但似乎没有任何效果，真的很想得到一些帮助！

错误：

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()

来自另一个人的呼叫示例 class:

import tkinter
from Screenshot import Screenshot


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

Answer 1

您想将 Toplevel 的 parent/master 设置为 self.master 而不是 root。 root 未在 Screenshot class 的范围内定义，但输入参数 master 确实指向它。

self.master_screen = Toplevel(self.master)

Python，Tkinter - 未定义根

Python, Tkinter - root is not defined

python

class

user-interface

tkinter

tk