Object oriented programming

• SOLID Priniciples
• To continue building our calculator, we need to
  • unit test
  • exception handling
  • abstraction
  • standard library
  • pythonic coding

Python abstract classes

• Refer Here for abstract classes
• Refer Here for jupyter notebook

Create virtual environment in python

• Refer Here for virtual environment
• Lets Create virtual environment and follow standard structure
• create a new folder
• now cd into this folder
• Create a virtual environment

python -m venv .venv

• Now activate virtual environment
  • Window .venv\Scripts\activate
  • mac/linux source .venv/bin/activate
    
• To download additional packages

pip install <package>

• To list all the installed packages

pip freeze
pip freeze > requirements.txt

• To install dependencies from requirements.txt

pip install -r requirements.txt

• Exercise:
  • create a new folder
  • activate the virtual environment
  • install the package called pytest