Python 3.7.3 : Using the flask - part 001.

A short intro into this python module can be found at the PyPI website:
Flask is a lightweight WSGI web application framework. It is designed to make getting started quick and easy, with the ability to scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja and has become one of the most popular Python web application frameworks.

Flask offers suggestions but doesn’t enforce any dependencies or project layout. It is up to the developer to choose the tools and libraries they want to use. There are many extensions provided by the community that makes adding new functionality easy.
The reason I used a series of tutorials with this python module is the complexity of the features of this python module.
Let's briefly outline some of the essential aspects of flask programming.

• Flask is a simple, lightweight, and minimalist web framework;
• Flask is developed based on the Jinja2 template engine;
• Flask depends on the Jinja template engine and the Werkzeug WSGI toolkit;
• Flask does not provide a built-in ORM system (Object Relation Mapping);
• in Flask web applications to perform CRUD operations on a database can be tedious (see: ORM techniques of Flask-SQLAlchemy);
• The Flask has a simple and customizable architecture;
• the Flask to accelerate the development of simple websites that use static content;
• has the option to extend and customize Flask according to precise project requirements;

A list of companies using the Flask framework - who is using Flask?
The install process is very simple using the pip tool:

C:\Python373>cd Scripts

C:\Python373\Scripts>pip install flask
Collecting flask
...
Installing collected packages: itsdangerous, Werkzeug, flask
Successfully installed Werkzeug-0.15.4 flask-1.1.1 itsdangerous-1.1.0

Let's start initializing the first flask application into the server.py file:

from flask import Flask 
app = Flask (__name__)
# create a wrarp of localhost
@app.route('/')
def home():
 return 'Hello world'
# the default name main 
if __name__ == '__main__':
 app.run()

About Routing and Variable Rules.
This can change it into the server.py script like this:

@app.route('/about')
def about():
 return 'The about page'
@app.route('/blog')
def blog():
 return 'This is the blog'

The next step is the variable rule issue:

# creaza a regula variabila ( variable rules) 
# the type of the variable can be set, see int 
# @app.route('/blog/')
@app.route('/blog/')
def blogpost(blog_id):
 return 'This is the post '+str(blog_id)

To run it, just use:

C:\Python373\my_flask>python server.py
 * Serving Flask app "server" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

The full source code can be found at my GitHub account.