运行另一个python文件，该文件使用Tkinter窗口显示相机预览

import tkinter as tk
from PIL import Image, ImageTk
import cv2

class CameraPreview:
    def __init__(self, window, window_title, video_source=0):
        self.window = window
        self.window.title(window_title)
        self.video_source = video_source

        # Open the video source
        self.vid = cv2.VideoCapture(self.video_source)
        if not self.vid.isOpened():
            raise ValueError("Unable to open video source", video_source)

        # Default resolutions of the frame are obtained.
        self.delay = 15
        self.update()

        self.window.mainloop()

    def update(self):
        # Get a frame from the video source
        ret, frame = self.vid.read()
        if ret:
            frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            self.photo = ImageTk.PhotoImage(image=Image.fromarray(frame))
            self.canvas.create_image(0, 0, image=self.photo, anchor=tk.NW)

        self.window.after(self.delay, self.update)

    def __del__(self):
        if self.vid.isOpened():
            self.vid.release()

# Create a window and pass it to the Application object
CameraPreview(tk.Tk(), "Tkinter Camera Preview")

import subprocess

def run_camera_preview():
    subprocess.run(['python', 'camera_preview.py'])

if __name__ == "__main__":
    run_camera_preview()

subprocess.run(['python', '/path/to/camera_preview.py'])