Flask Web开发基于Python的Web应用问题

from camera  import Camera
from flask import Flask, render_template, Response

app = Flask(__name__)

@app.route('/')

def index():
    return render_template('index.html')


def gen(camera):
    while True:
        frame = camera.get_frame()
        yield (b'--frame\r\n'
               b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n')

@app.route('/video_feed')
def video_feed():
    return Response(gen(Camera()),
                    mimetype='multipart/x-mixed-replace; boundary=frame')

if __name__ == '__main__':
    app.run(host='0.0.0.0', threaded=True)

import time import time

class Camera(object):
    def__int__(self):
        self.frames = [open(f + '.jpg', 'rb).read() for f in ['1', '2', '3']]
                    
    def get_frame(self):
       return self.frames[int(time()) % 3]