我有一个下面的类代码，当从中if __name__ == '__main__':调用时，它可以正常工作，但是当我从另一个.py文件中调用它时，它会吐出错误。抱歉，如果这是我的基本错误，但我尝试了很多东西，但似乎没有任何效果，真的希望获得帮助！
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
班级：
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()
从另一个类调用的示例：
import tkinter
from Screenshot import Screenshot
root = tkinter.Tk()
app = Screenshot(root)
root.mainloop()
您想将的父/母设置Toplevel为self.master而不是root。root没有在Screenshot类的范围内定义，但输入参数master确实指向它。
self.master_screen = Toplevel(self.master)
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