Reload Flask app when template file changes

Question

By default, when running Flask application using the built-in server (Flask.run), it monitors its Python files and automatically reloads the app if its code cha

Answer 1

For me works just fine:

 from flask import Flask, render_template, request, url_for, redirect
 app = Flask(__name__)
 app.config["TEMPLATES_AUTO_RELOAD"] = True

See more on http://flask.pocoo.org/docs/1.0/config/

Answer 2

See http://flask.pocoo.org/docs/1.0/quickstart/ and use FLASK_ENV=development

Answer 3

Actually for me TEMPLATES_AUTO_RELOAD = True does not work (0.12 version). I use jinja2 and what i have done:

1. Create function before_request

   def before_request():
       app.jinja_env.cache = {}
   

2. Register it in application

   app.before_request(before_request)
   

3. That's it.

Answer 4

What worked for me is just adding this:

@app.before_request
def before_request():
    # When you import jinja2 macros, they get cached which is annoying for local
    # development, so wipe the cache every request.
    if 'localhost' in request.host_url or '0.0.0.0' in request.host_url:
        app.jinja_env.cache = {}

(taken from @dikkini's answer)