Day 7 — Django Basics | Python Internship

0–5 min
Real Hook

5–25 min
Core Concept

25–45 min
Live Coding

45–55 min
You Code It

55–60 min
Cheat Sheet

🔥 Real-World Hook (0–5 min)

Before Django: building a Python web app meant manually parsing HTTP headers, managing database connections, and writing your own session system — weeks of work just to show a webpage.

After Django: 3 commands and your app is running. Instagram was built on Django. Disqus serves 500 million users on Django. Pinterest, Mozilla, Bitbucket — all Django. Today you build your first real web app.

🋍 Django's MVT Architecture (5–25 min)

💡 Analogy — Django is a Restaurant

Model — The kitchen (stores and manages data in the database).
View — The waiter (receives request, fetches data, returns response).
Template — The menu/plate (how data is presented to the user).
URL — The front door (which URL goes to which view).

💻 Live Coding — First Django App (25–45 min)

# Step 1: Create project
pip install django
django-admin startproject studentproject .
python manage.py startapp students

# Step 2: models.py ── define your data
from django.db import models

class Student(models.Model):
    name  = models.CharField(max_length=100)
    email = models.EmailField(unique=True)
    dept  = models.CharField(max_length=50)
    gpa   = models.DecimalField(max_digits=3, decimal_places=2, default=0.0)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.name} ({self.dept})"

    class Meta:
        ordering = ["-gpa"]   # default sort: highest GPA first

# Step 3: views.py ── handle requests
from django.shortcuts import render
from .models import Student

def student_list(request):
    students = Student.objects.all()          # Django ORM: SELECT * FROM students
    return render(request, "students/list.html", {"students": students})

def student_detail(request, pk):
    student = Student.objects.get(pk=pk)      # SELECT WHERE id=pk
    return render(request, "students/detail.html", {"student": student})

# Step 4: urls.py
from django.urls import path
from . import views

urlpatterns = [
    path("students/",       views.student_list,   name="student-list"),
    path("students//", views.student_detail, name="student-detail"),
]

# Step 5: Run migrations and start server
python manage.py makemigrations
python manage.py migrate
python manage.py createsuperuser
python manage.py runserver            # http://127.0.0.1:8000

🎯 You Code It (45–55 min)

Create a new Django project: django-admin startproject myapp .
Create app: python manage.py startapp products
Define a Product model: name, price (DecimalField), category, in_stock (BooleanField)
Add to INSTALLED_APPS in settings.py, run makemigrations + migrate
Register Product in admin.py, create a superuser, go to /admin
Add 5 products via the Django admin panel
Show: Admin panel with 5 products visible

📄 Day 7 Cheat Sheet — Django Basics

Django Commands

django-admin startproject name .	New project
python manage.py startapp name	New app
python manage.py makemigrations	Detect changes
python manage.py migrate	Apply to DB
python manage.py createsuperuser	Admin user
python manage.py runserver	Start server

Model Fields

CharField(max_length=100)	Short text
TextField()	Long text
IntegerField()	Whole number
DecimalField(max_digits,decimal_places)	Price
BooleanField(default=True)	True/False
DateTimeField(auto_now_add=True)	Timestamp

URL Patterns

path("url/", view, name="")	Simple URL
path("url/<int:pk>/", view)	Integer param
path("url/<str:slug>/", view)	String param
include("app.urls")	Include app URLs
reverse("name")	URL from name

settings.py Essentials

INSTALLED_APPS	Add your app here
DATABASES	DB connection
STATIC_URL	CSS/JS location
TEMPLATES	HTML template config
SECRET_KEY	Never commit this!
DEBUG = False	In production

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