Download and verify Python 3.9.5 for Windows from python.org, checking the checksum. Install with default or custom options, then verify with the command prompt and python shell.

Explore how Python declares variables by assigning values, observe dynamic typing in action, and learn about types, memory addresses, and declaration syntax.

Explore enclosing and built-in scopes in Python, studying global and local variables, nested functions, and how inner variables affect or do not affect outer ones through nonlocal scope.

Explore the nonlocal keyword in Python 3, learn how inner functions access and modify variables in outer scopes, and why binding errors occur in nested function contexts.

Explore Python numeric types, including integers, floats, and complex numbers, and booleans, with decimal, binary, octal, and hexadecimal representations, plus type checking and base conversions.

Explore identity operators in Python, learning how 'is' and 'is not' compare objects by memory location rather than value, and contrast them with value-based comparison and other operator families.

Explore how to index elements in a Python tuple, access items with positive and negative indices, and iterate using range and len on a sample omeprazole tuple.

Learn how to change elements in a tuple by converting it to a list, modifying, and converting back, while noting that tuples are immutable but lists inside can be changed.

Explore unpacking tuple elements into variables in Python, using exact-variable assignments or an asterisk to capture remaining values, with examples and common error handling.

Learn how Python sets store multiple unique values, are unordered and unindexed, and cannot hold lists or dictionaries; create sets with curly braces and perform union, intersection, and difference.

Explore disjoint sets, subsets, and supersets with Python set operations, and verify disjointness, subset, and superset relationships through practical examples.

Learn how to access dictionary elements in Python using key index, the get method, and views for keys, values, and items, including nested dictionaries and presence checks.

Update dictionary elements in Python using key index assignment, the update method, and merging with another dictionary; learn how keys, values, and items control additions and updates.

Explore dictionary built-in functions in Python, including all, any, len, and sorted, with examples of evaluating non-empty and empty dictionaries. Learn how these functions reveal keys, lengths, and sorted orders.

Learn how fromkeys creates a dictionary with given keys and a default value, and how setdefault adds missing keys with defaults or leaves existing values unchanged.

Learn how to validate key existence with in and not in, and iterate through dictionary keys to access and print their values using a sample courses dictionary.