https://www.py4e.com/lessons/dictionaries
https://runestone.academy/ns/books/published/py4e-int/dictionaries/toctree.html
https://www.keithdillon.com/index.php/python-for-data-science-spring-2026/
GitHub Classroom: https://classroom.github.com/classrooms/250035910-keithops-bds754-s26
Google CoLab: https://colab.research.google.com/notebooks/welcome.ipynb
lst = dict() #[0]*10
#len(lst), lst
lst[0] = 21
lst['age'] = 182
lst
{0: 21, 'age': 182}