Django

1. Django kya hai

• Django Python ka web framework hai. Web framework ka matlab: ek aisi tool kit jo web applications banane me help kare. Ye already bohot sari cheezein ready provide karta hai, jaise:
• Database handle karna
• URLs route karna
• HTML templates show karna
• User authentication (login/signup)
• Admin panel

Simple example: Agar tum website banate ho jahan users posts likhte aur read karte hain, Django ye sari cheezein easy bana deta hai.

2. Django kyun use karte hain

• Fast development: Har cheez scratch se na likhni pade
• Secure: Built-in security features
• Scalable: Small se large websites tak kaam karta hai
• ORM (Object Relational Mapping): Python code se database manage hota hai, SQL nahi likhna padta
• Admin panel: Data ko easily manage kar sakte ho without writing extra code

3. Django qq use karte hain (benefits)

• Manual coding kam ho jati hai, repetitive kaam automatic ho jata hai
• Ek hi framework se database, front-end, routing sab handle hota hai
• Open-source aur Python ke saath fully compatible
• Community support bohot strong hai

Ab agar ye clear hai, tab hum project start karna sikhenge:

• Install karenge Django
• Project create karenge
• Server run karenge
• Apps banayenge

Python check karo

• Django Python me chalta hai, isliye pehle Python install hona chahiye.
• Terminal/Command Prompt me check karo:

python --version

Agar version show ho gaya, matlab Python installed hai.

Step 2: Django install karo

• Terminal me ye command run karo:

pip install django

• Ye Django ko install karega. Check karne ke liye:

django-admin --version

• Agar version number show ho gaya, matlab install successful hai.

Step 3: Naya project create karo

• Terminal me ye command run karo:

django-admin startproject myproject

• Ye myproject naam ka folder banayega jisme ye cheezein hongi:
• manage.py → commands run karne ke liye (server, migrations, etc.)
• myproject/ folder:
• init.py → Python package ko mark karta hai
• settings.py → project ki settings (database, apps, templates)
• urls.py → URLs ko views ke saath map karta hai
• wsgi.py → server deploy ke liye
• asgi.py → async server ke liye

Step 4: Server run karo

• Project folder me jao:

cd myproject

• Run karo server:

python manage.py runserver

• Browser me jao: http://127.0.0.1:8000/
• Django ka welcome page dikhega, matlab project successfully create ho gaya hai.

Step 5: App create karna

• Django project me apps hoti hain jo alag alag functionalities handle karti hain.
• Example: ek blog app, ek users app, ek shop app.
• Terminal me project folder ke andar ye command run karo:

python manage.py startapp myapp

• Ye myapp folder banayega, jisme ye files hongi:
• models.py → database tables define karne ke liye
• views.py → logic aur data process karne ke liye
• urls.py → app ke URLs handle karne ke liye (agar create karo)
• admin.py → admin panel me model show karne ke liye
• apps.py → app ka configuration
• migrations/ → database changes store karne ke liye

Step 6: App ko project me add karna

• Open karo settings.py (project ke folder me)
• INSTALLED_APPS list me apna app add karo:

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'myapp',  # ye tumhara app
]

• Isse Django ko pata chal jata hai ke ye app project ka part hai.

Step 7: Model create karna

Models database ka blueprint hote hain. Simple.

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model batata hai:
• Kaunsa data store hoga
• Kis type ka hoga
• Tables ka structure kya hoga

Agar model nahi banaya:
• Database messy ho jata
• Data control nahi rehta
• Bugs paida hote hain

Model se Django automatically:
• Database table banata hai
• CRUD operations deta hai
• Validation handle karta hai

• myapp/models.py me likho example:

from django.db import models

class Post(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)

Samjhauta:

• Post table create hogi database me
• Columns: id (automatic), title, content, created_at
• auto_now_add=True ka matlab: date aur time automatically save hoga jab naya post create hoga