An ‘about’ route is shown highlighted here. * Detected change in 'C:\\python\\flask\\flask-tutorial\\hello.py', reloadingĬhecking the result in the browser shows we did in fact make a change to the code.Īdding routes is quite easy, all we need to do is use the Python decorator again followed by a new function. When you make a change to your application, you will see in the terminal that Flask detects that change and reloads accordingly. The app is now being served as a development environment. Now we can run the server again, and notice that the output is different. flask-tutorial $ export FLASK_ENV=development We can do this via an environment variable like so. An easier approach is to use the development environment which automatically detects any changes or updates to the software, and reloads the server for you. You would need to shut down the server, and then relaunch in order to import any changes or updates into the application. When using the approach above, if you make a change or add new features to the Flask application, they will not be reflected in the running app. This looks a little better! In addition, visiting the given URL in a web browser shows us that the route is working! * Serving Flask app 'hello' (lazy loading) Once this is in place, lets try to run the server again.
This is easily fixed with the following command at the terminal. Flask needs an environment variable in order to run. You did not provide the "FLASK_APP" environment variable, and a "wsgi.py" or "app.py" module was not found in the current directory. Do not use it in a production deployment.Įrror: Could not locate a Flask application. To run this application, we need to visit this same directory at the command prompt and use the command flask run and here is the result we get: flask-tutorial $ flask run This code imports the Flask library, creates an app and defines the homepage for a simple web server. We can open that directory and add a hello.py file to get started writing Flask code. flask $ mkdir flask-tutorialįlask $ cd flask-tutorial Open Directory In P圜harm Let’s create a simple directory to hold the Python files that we’ll use to test Flask. flask $ pip install flask Create Directory For Project Installing Flask is a simple one liner using the Python pip tool. In this Flask tutorial, we’ll get Flask installed and learn how to create some routes in Flask. There is a templating system, message flashing, URL routing, support for serving static files, and more. Flask has many powerful features to help you develop websites quickly. Flask is a Python framework for web development where you can get up and running with a single file and five lines of code! Flask is also a great way to create an API and you can create a JSON API in one line of code.
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