how to allow my flask server to be accessible to the internet code example

Example: display flask across network

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
  return "Hello world!" 

if __name__ == '__main__':
    app.debug = True
    app.run(host="0.0.0.0") #host="0.0.0.0" will make the page accessable
                            #by going to http://[ip]:5000/ on any computer in 
                            #the network.