Added Day 46 for Python

2023/day46.md

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+# Day 46 - Web development in Python
+
+Python is quite capable when it comes to web development, and there are a variety of frameworks and modules are available for it. These can be used to create web applications.
+Flask, Django, and Pyramid are a few well-known frameworks. The choice of framework will rely on the project's requirements. Each of these frameworks has advantages and disadvantages of its own.
+
+## Creating a basic web app using Flask:
+
+Creating a basic web application using Flask: Flask is a micro web framework for Python that is easy to learn and use. It provides a simple way to create web applications and APIs using Python. Here are some examples of Flask code for creating a basic web application:
+
+``` python
+from flask import Flask
+
+app = Flask(__name__)
+
+@app.route('/')
+def hello_world():
+    return 'Hello, World!' 
+```
+This code creates a Flask application and defines a single route for the root URL (/). When the user visits the URL, the hello_world() function is called and returns the string 'Hello, World!'.
+
+## Working with databases:
+
+The majority of online applications need some sort of permanent storage, and Python offers a number of modules and frameworks for doing so. Popular options include Django ORM, Peewee, and SQLAlchemy. Here is an illustration of how to work with a SQLite database using SQLAlchemy:
+
+``` python
+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
+db = SQLAlchemy(app)
+
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(50))
+
+@app.route('/')
+def index():
+    users = User.query.all()
+    return render_template('index.html', users=users)
+```
+This code creates a SQLite database and a User table using SQLAlchemy. The index() function queries the database for all users and passes them to the template for rendering.
+
+Having a good understanding of how these web apps work, will help you with automation and deployment when it comes to practicing DevOps.
+You can dive deeper into how you can build APIs using Python and serverless technologies like AWS Lambda, Azure Functions etc.
+
+I have a demo on [how I built a serverless resume API](https://github.com/rishabkumar7/AzureResumeAPI).