Nginx, uWSGI, Flask app doesn't show changes until the server is restarted

Question

Every time I update my Python file, I have to reboot the server to see changes. I have tried restarting Nginx and uWSGI with no luck. Flask is running in debug mode. How can I see changes without rebooting the entire server?

app.py

from flask import Flask
import time
import cv2

app = Flask(__name__)

@app.route("/")
def main():
   return "Hello cob at " + time.time().__str__() + "\n"

if __name__ == "__main__":
    app.run(debug=True)

uwsgi.ini

[uwsgi]
socket = :9090
plugin = python
wsgi-file = /home/vagrant/PythonVision/app.py
process = 3
callable = app

nginx.conf

server {
  location / {
    include uwsgi_params;
    uwsgi_pass 127.0.0.1:9090;
  }
}

I am testing this with these steps:

• change the return message from "Hello cob" to "hello bob", save the file
• Refresh the page in a browser (clear cache of browser) No change
• Do sudo service uwsgi restart, sudo service nginx restart
• Refresh the page in a browser (clear cache of browser) No change

Answer 1

So, one way I got around this was to do this in my uwsgi.ini file

touch-reload = /home/vagrant/PythonVision/app.py

Then I touch the file app.py and BANG sorted

Answer 2

To actually run your flask app in debug mode, you run this command:

python /home/vagrant/PythonVision/app.py

Then you can go on your browser: http://ip:5000/.

Since I know you're running this on vagrant, the ip might be defined by your configs, but that's beyond the scope of this question.