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How Python Runs: Python: Uncharted

Courses PythonHow Python Runs

How Python Runs

Connect Python names to objects, reason about identity and mutability, uncover the protocols behind familiar syntax, and trace the engine through reference counting, bytecode interpretation, and the GIL.

Python
Unit 18 of 20
20 lessons
180 min
420 XP

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Lessons

20 total

1Everything Is an ObjectInspect the type and stable identity of numbers, strings, functions, and classes.CodeConcept7 min20 XPOpen
2Names Point, Objects LivePredict how aliases and a slice copy respond to one list mutation.InteractiveConcept9 min20 XPOpen
3is vs ==Distinguish equal list values from identical list objects using is, ==, and id.CodeConcept8 min20 XPOpen
4Mutable or NotMatch core container and scalar types to their mutability behavior.InteractiveConcept8 min20 XPOpen
5The Shared Shopping ListObserve aliasing through mutation, then break the link with a slice copy.CodeConcept9 min20 XPOpen
6Shallow and DeepContrast a shallow outer copy with separately copied nested lists.CodeConcept9 min20 XPOpen
7The Mutable Default TrapReplace a shared list default with None and create a fresh list per omitted argument.CodeConcept8 min20 XPOpen
8Tuples Holding ListsPredict mutation of a list referenced by an otherwise immutable tuple.InteractiveConcept9 min20 XPOpen
9Pass by What?Show that parameter mutation reaches the caller while local reassignment does not.CodeConcept9 min20 XPOpen
10The Reference CounterCount strong name references until an object becomes unreachable.InteractiveConcept9 min20 XPOpen
11Garbage DayDistinguish reachability, reference counting, cyclic collection, and cleanup timing.InteractiveConcept8 min20 XPOpen
12for, Under the HoodRewrite a for loop as iter, next, and precise StopIteration handling.CodeConcept10 min20 XPOpen
13Dunders Answer the PhoneImplement __len__ and __add__ so built-in syntax delegates to a custom class.CodeConcept10 min20 XPOpen
14Build a Range-LikeImplement __iter__ as a generator so a custom range-like object works in for loops.CodeConcept9 min20 XPOpen
15Attribute Lookup OrderPredict instance attribute shadowing and fallback to a class attribute.InteractiveConcept9 min20 XPOpen
16Source to BytecodeIdentify Python’s compile-to-bytecode and interpreter execution story without overclaiming.InteractiveConcept8 min20 XPOpen
17The One-Lane BridgeExplain what CPython’s GIL limits and what concurrency it still permits.InteractiveConcept10 min20 XPOpen
18Small Number SurprisesObserve small-integer identity caching while using equality as the value rule.CodeConcept10 min20 XPOpen
19Narrate a LineNarrate name lookup, method binding, argument lookup, call, and mutation for one line.InteractiveConcept9 min20 XPOpen
20How Python Runs Mastery CheckPredict difficult outcomes across names, mutability, protocols, and the Python engine.InteractiveMastery check12 min40 XPOpen

Decorators and Function Craft Data Structures and Algorithms, in Python