sock.bind(sockaddr) OSError: [WinError 10048] Usually each socket address (protocol/network address/port) is only allowed to be used once.

Run the following program:

if __name__ == '__main__':
    # 创建一个应用对象
    app = tornado.web.Application([(r'/api/chatbot', IndexHandler)])
    # 绑定一个监听端口
    app.listen(8000)
    # 启动web程序，开始监听端口的连接
    tornado.ioloop.IOLoop.current().start()

Error:
sock.bind(sockaddr)
OSError: [WinError 10048] Usually each socket address (protocol/network address/port) is only allowed to be used once.
As shown in the figure below:

Solution:
Change the code

app.listen(8000)

tweak to

app.listen(8080)

solve.