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Classes: Python: Uncharted

Courses PythonClasses

Classes

Create independent instances, change and coordinate their state through methods, connect classes to Python protocols with dunder methods, extend behavior through inheritance, and choose classes or dictionaries to fit a model.

Python
Unit 14 of 20
20 lessons
180 min
420 XP

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Lessons

20 total

1Nouns with AbilitiesDistinguish what a vending-machine object knows from what it can do.InteractiveConcept7 min20 XPOpen
2class and __init__Define a class whose __init__ method stores constructor values on each instance.CodeConcept8 min20 XPOpen
3self Means MeUse self in a method to read the attributes of the receiving instance.CodeConcept8 min20 XPOpen
4Many from OneCreate three class instances whose visit state changes independently.CodeConcept8 min20 XPOpen
5Methods That Change StateImplement deposit and spend methods that update one Wallet instance safely.CodeConcept9 min20 XPOpen
6Constructor GuardsRaise ValueError when constructor inputs cannot form a valid reservation.CodeConcept9 min20 XPOpen
7Methods That CooperateCall a sibling method through self instead of duplicating its rule.CodeConcept8 min20 XPOpen
8Whose Attribute Is It?Predict how instance attributes shadow changing class attributes.InteractiveConcept8 min20 XPOpen
9Assemble the ClassOrder the parts of a working Python class from definition through method use.InteractiveConcept8 min20 XPOpen
10__str__ Makes It SpeakDefine __str__ so printing an Order produces readable text.CodeConcept9 min20 XPOpen
11__eq__ Makes It ComparableDefine coordinate equality for Point instances through __eq__.CodeConcept9 min20 XPOpen
12__len__ Makes It SizedDefine __len__ so the built-in len function reports a Playlist size.CodeConcept9 min20 XPOpen
13Inherit the BasicsMake ElectricVan inherit a base constructor and method from Van.CodeConcept9 min20 XPOpen
14super() Calls HomeExtend base initialization through super() without repeating parent assignments.CodeConcept9 min20 XPOpen
15Override PolitelySpecialize an inherited method while preserving its input and return contract.CodeConcept9 min20 XPOpen
16Class or Dict?Choose dictionaries for plain records and classes for repeated stateful behavior.InteractiveConcept8 min20 XPOpen
17Vending Machine BuildBuild a vending machine with coin, selection, dispense, and refund behavior.CodePractice12 min20 XPOpen
18Courier ClassModel a Courier whose coordinates change through directional move calls.CodePractice11 min20 XPOpen
19Teach self to a FriendExplain what self represents and how Python supplies it for a method call.InteractiveConcept10 min20 XPOpen
20Classes Mastery CheckCombine independent state, dunder protocols, inheritance, and cooperating methods.CodeMastery check12 min40 XPOpen

Recursion Errors and Robustness