09
What compile() actually produces
Follow Python source through ASTs and code objects, then watch execution supply the frame and namespaces that compiled code does not contain.
Independent field notes / Vol. 01
Python,
below the surface.
Precise explanations of the machinery, patterns, and tradeoffs that make Python feel deceptively simple.
Read the cover storyThe index
Choose a rabbit hole.
49 notes, edited for signal.
10
Containers are bundles of protocols
Design collection behavior by choosing iteration, membership, sizing, indexing, and mutation deliberately.
11
Context managers encode cleanup
Make resource lifetime visible, exception-safe, and reusable with the context management protocol.
12
super() is a cooperative MRO machine
Replace the parent-call myth with a precise model of MRO-relative lookup, cooperative methods, and safe multiple inheritance.
13
Inside CPython's allocator
Connect Python allocations to pymalloc arenas, pools, blocks, process RSS, tracemalloc domains, and responsible measurement.
14
Crossing the Python boundary
Move useful work across Python, native, I/O, and process boundaries without optimizing the wrong crossing.
15
Deque, heap, and bisect: choosing the non-obvious container
Match queues, priorities, and sorted searches to the containers that make their dominant work cheap.
16
Exceptions are control flow with machinery
Follow exceptions through matching, unwinding, chaining, cleanup, exception groups, and CPython 3.14 exception tables.
Editorial policy
No listicles. No folklore. No just trust me abstractions.
Every note should leave you with a better model of the system, not just another snippet to paste.