Code a simple app In Flask
How To code a simple Flask Application
This page explains how to code a simple Flask application.
Prerequisites
Basic programming knowledge in Python
Basic Flask knowledge
Comfortable using a terminal
A minimal app
Before using Flask, we need to install it. Open a terminal and type:
$ pip install Flask
Create a new file hello.py with the following content:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello():
return f'Hello from Flask!'
Once the file is saved, let's start the app:
$ # Set up the DEBUG environment
$ # (Unix/Mac) export FLASK_ENV=development
$ # (Windows) set FLASK_ENV=development
$ # (Powershell) $env:FLASK_ENV = "development"
$
$ flask run
$ # Visit the app in browser: http://127.0.0.1:5000/
By visiting the app in the browser we should see "Hello from Flask" message.
Links & Resources
More Flask Apps provided by AppSeed
More Flask Dashboards - a curated index provided by AppSeed
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