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Python Craft & Sharp Edges

Mutable defaults, slots, descriptors, and the traps senior devs still step in.

Go beyond tutorials: mutable default arguments, __slots__, functools caches, dataclass footguns, pathlib patterns, and import machinery. Battle-tested wisdom you rarely find in blog posts.

Practitioner6 lessons~4h
0/6 complete

Course content

Footguns

  • ○Mutable Default Arguments (The Classic)14 min

Performance & API

  • ○__slots__ — When and Why16 min

stdlib Secrets

  • ○functools.lru_cache — Hashability & Memory15 min
  • ○pathlib vs os.path — The Modern Way14 min

Modern Python

  • ○dataclass Field Defaults & Ordering16 min

Under the Hood

  • ○importlib — Loading Modules Programmatically18 min