Python Classroom notes 03/Aug/2026

Web Programming

• Here we have two problems to solve

  • Web serving html pages => Web APP
    • Frameworks: Django
  • Web serving data/actions/method => APIs
    • Frameworks:
      • FastAPI
      • Flask
      • Django-restful

• our focus: APIs with FastAPI

Lets use a calculator which is hosted as api

• Instructions to run an api server on your system

git clone https://github.com/asquarezone/Python.git
cd Python/Aug26/WebAPIs/using_apis/calc
python -m venv .venv
.venv/Scripts/activate
# source .venv/bin/activate
pip install -r requirements.txt
#python main.py
fastapi dev main.py

• Naviagate to http://127.0.0.1:8000/docs

• This api has add, sub, mul, div

• access add http://127.0.0.1/add?a=3&b=5

  • url: http://127.0.0.1/add
  • parameters:
    • query string: starts with ?<name1>=<value1>&<name2>=<value2>&

• Install postman app and use as it is recommened in the class

• Lets write a client in python which does this

• Create a new virtual environment

• Create a file called as calc_client.py
• Refer Here for changes done

Lets use some existing apis

• Lets get all the products: Refer Here

• url: ‘https://fakestoreapi.com/products`

• Refer Here for changes.