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// Code Example
dict_modifying.py
Modifying a dict — direct assignment, update, setdefault, pop, popitem, clear. Methods that write, and the one mistake …
// Code Example
dict_inspection.py
Getting information from a dict — in, len, keys, values, items, copy. Reading without changing, and the copy trap that …
// Code Example
dict_iteration.py
Iterating over a dict — keys, values, and pairs. The three patterns, when to use each, and how to build a new dict from…
// Code Example
dict_nested.py
Nested dicts — one structure, all the data. Creating, accessing with two keys, looping with items(), modifying inner di…
// Exercise
tip_calculator.py
Tip Calculator — bill amount, service rating, dict lookup, tip and total calculation. A dict doing exactly what dicts a…
// Exercise
shopping_list_2.py
Shopping List upgraded — items with quantity and price, nested dict per entry, checkout with total. The list you built …
// Exercise
pet_shop.py
Pet Shop — nested dicts, view all, search by name, buy and mark as sold. A nested dict doing real inventory work.
// Other
dict_mistakes.py
8 mistakes almost every beginner makes with dicts. Wrong way, error, right way — all in one file.
// Cheatsheet
Lists — The Full Picture
Dicts — The Full Picture. Creating, reading, modifying, inspecting, iterating, nested dicts, safe access patterns, and …
// Cheatsheet
Dicts — The Full Picture
Everything you've learned about dicts — in one place. Creating, reading, modifying, inspecting, iterating, nested dicts…
// Achievement
dictionaries_complete_medal.stl
You finished the Dictionaries chapter. Download, print, and keep it. You earned it.
// Code Example
tuple_usage.py
Tuples in practice — indexing, slicing, looping, unpacking, multiple return values, dict keys, and converting between t…
// Exercise
temperature_converter_2.py
Temperature Converter — conversion formulas stored as tuples, looked up by mode, unpacked and applied. A tuple doing ex…
// Code Example
set_usage.py
Sets in practice — add, remove, discard, membership checking, union, intersection, difference, and the patterns that ma…
// Exercise
attendance_tracker.py
Mark students present one by one. Enrolled set, present set, absent via set difference. add(), in, and one line that do…