Flask is a microframework for Python that allows for easy development of web applications. It began as an April Fool's joke but became popular enough to be developed into a full framework. The document discusses installing Flask and related packages like Flask-SQLAlchemy and Flask-Mail. It covers setting up a virtual environment for projects, installing dependencies, and includes code examples for basic Flask app configuration, SQLAlchemy integration, and using Flask-Mail to send emails. The goal is to build a simple TODO list web application to demonstrate Flask implementation.

2. Delivered As
“It came out of an
April Fool's joke but
proved popular enough
to make into a
serious application
in its own right.”
2

3. Our process is easy
Flask?
3
Getting Started Implementation

4. 1.
Flask in a Glance
4

5. What’s the deal?
Microframework Easy to code Easy to configure
5
Well Documented Restful Testable
Open Source WSGI JINJA 2

6. Extensible
It offers great deal of functionality
freedom, plug as you go
6

7. 2.
Installation and
Configuration
7

8. Virtualenv
Virtualenv is a tool for creating
isolated python environment
8
$ sudo apt-get install python-virtualenv
$ virtualenv ENV
$ . ENV/bin/activate
$ deactivate
virtualenv
Python
2.X
Python
3.X
Python
2.X

9. Project Structure
Project_name
ENV
static
css
js
templates
app.py
9

10. Flask Installation
10
$ . ENV/bin/activate
$ pip install Flask
#import the flask package
from flask import Flask
#initialize the app
app = Flask(__name__)
#define a route
@app.route(‘/’)
def HelloWorld():
return ‘Hello World’
#run the app
app.run(debug=True, port=8080)https://localhost:8080

11. Project dependencies
flask-SQLAlchemy
Python SQL toolkit and ORM that
works independently from database
type
flask-mail
Mail extension provides an interface
to set up SMTP and to send
messages from your views and
scripts
11
$ pip install flask-SQLAlchemy $ pip install flask-mail
enum
Enum is a package that helps in
mapping enum in sqlalchemy
$ pip install enum34

12. Flask SQLAlchemy
12
#import packages
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
#initialize the app
app = Flask(__name__)
db = SQLAlchemy(app)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://root:@localhost/todolist'
#run the app
app.run(debug=True, port= 8080)

13. Flask Mail
13
#import packages
from flask import Flask
from flask_mail import Mail
#initialize the app
mail = Mail()
app = Flask(__name__)
mail.init_app(app)
#route
@app.route("/")
def index():
msg = Message("Hello", sender="from@example.com", recipients=["to@example.com"])
#run the app
app.run(debug=True, port= 8080)

14. 3.
Realisation
14

15. 15
Web App
We will be working on a
simple TODO app

16. 16
THANKS!
Pay Attention to Code!