Flask 1 - Set Up a Basic App

🍶 Flask is a framework to build websites. Here, we will make a simple blogging website. Below are the steps to start.

1. Install Python 
2. Install Pip 
3. Install Flask

Run the following code in Command Line:

import flask #TO CHECK IF FLASK IS INSTALLED
exit() #TOEXIT FLASK
cd inqzit #TO GO TO THE FOLDER

Create a python file and name it app_001001_start.py. Add the following code in it.

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():

    return "Hello World!"

Run the following code in Command Line:

set FLASK_APP=app_001001_start.py #TO START RUNNING THE APPLICATION SERVER
set FLASK_DEBUG = 1 #TO AUTO RUN SERVER WHEN FILES UPDATED
flask run #TO RUN THE SERVER

Go to http://127.0.0.1:5000/ or http://localhost:5000/ in browser.

Instead of set FLASK_DEBUG = 1 line, we can add a few lines of code in the python file itself for auto run of server when a file is updated. Add the following code in the file.

if __name__=='__main__':

app.run(debug=True)

Add another page to website

Simply add the following lines of code again. This time with a different url:

@app.route("/about")
def about():

    return "<h1>About Us</h1>"

To add another URL that calls the same function or page, simply add @app.route("/anything") above it. See in below example:

@app.route("/home")
@app.route("/about")
def about():

    return "<h1>About Us</h1>"