Python Web Development

Flask Web Development:

Installing Flask:

                                  
                                    pip install Flask

Creating a Simple Flask App:

                                  
                                    from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

if __name__ == '__main__':
    app.run(debug=True)

  • Save this code in a file, e.g., app.py.
  • Run the app with python app.py.
  • Open a web browser and go to http://127.0.0.1:5000/ to see "Hello, World!".

Adding Dynamic Content:

                                  
                                    from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def hello_world():
    return render_template('index.html', name='John')

if __name__ == '__main__':
    app.run(debug=True)

  • Create an templates folder in the same directory as your app.py.
  • Inside templates, create index.html:
                                  
                                    <!DOCTYPE html>
<html>
<head>
 <title>Flask Example</title>
</head>
<body>
 <h1>Hello, {{ name }}!</h1>
</body>
</html>

Django Web Development:

Installing Django:

                                      
                                        pip install Django

Creating a Django Project:

                                      
                                        django-admin startproject myproject

Creating a Django App:

                                      
                                        cd myproject
python manage.py startapp myapp

Defining Models:

In myapp/models.py:

                                      
                                        from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=50)

    def __str__(self):
        return self.title

Running Migrations:

                                      
                                        python manage.py makemigrations
python manage.py migrate

Creating Views:

In myapp/views.py:

                                      
                                        from django.shortcuts import render
from .models import Book

def book_list(request):
    books = Book.objects.all()
    return render(request, 'myapp/book_list.html', {'books': books})

Creating Templates:

Create myapp/templates/myapp/book_list.html:

                                      
<!DOCTYPE html>
<html>
<head>
<title>Django Example</title>
</head>
<body>
<h1>Book List</h1>
<ul>
    {% for book in books %}
      <li>{{ book.title }} by {{ book.author }}</li>
    {% endfor %}
</ul>
</body>
</html>

Configuring URLs:

In myproject/urls.py:

                                      
                                        from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('myapp.urls')),
]

In myapp/urls.py:

                                      
                                        from django.urls import path
from .views import book_list

urlpatterns = [
    path('books/', book_list, name='book_list'),
]

Now, run the development server:

                                      
                                        python manage.py runserver

Visit http://127.0.0.1:8000/books/ to see the list of books.

These examples provide a basic introduction to web development with Flask and Django.

Depending on your project requirements, you can choose the framework that best suits your needs.