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📜 WAYPOINT LESSON

Checkpoint: Internals

⭐⭐⭐ advanced⏳ 25 min read📍 Lesson 138 of 169

Detect a hoistable attribute load from bytecode — internals applied to performance.

Checkpoint — bytecode forensics

Implement:

  • count_attr_loads(func) — how many LOAD_ATTR instructions does the function's bytecode contain? (Use dis.get_instructions.)
  • hoistable(func) — True when an attribute lookup repeats (>1 LOAD_ATTR), i.e. hoisting it out of a loop is a candidate optimization.

This is the practical payoff of reading bytecode: spotting repeated work the profiler only hints at.