Assert in Python Checks conditions and values Debugging delight

Dicts hold keys and vals Sets are unordered and free Unique elements

Abs in Python code Complex numbers have their place Magnitude revealed

Length times width gives area Perimeter needs length and width Python makes math easy

Person class instance, Printed details come to light, Python reveals all.

Substring not found Returns -1 in Python Handle with caution

List comprehension Generates square numbers fast Efficient and neat

Minimal Flask shines, Simple routes and templates too, Testing support strong.

Install Flask with pip Create virtual environment Start building web apps