Python Default Argument Capture Readback

Use [Python function], [call sequence] and [runtime version]. Produce a 50-second debugging handoff reading the definition-time value and the later call-time variable value before explaining the observed default. Do not conflate this with a shared mutable list bug.

Use only the supplied facts and approved wording. If a necessary script or timing reference is missing, ask for it first. Produce the audio when supported; otherwise return the complete spoken script with pauses and a short production cue sheet, clearly labeled as a script. Use original voices and keep speech intelligible without music. Never claim an audio file exists unless it was generated.