Hands-on setdefault vs if-not-in vs defaultdict lab: real ops/s for list-append and counter default insert patterns, measured on Linux localhost (lab).
Hands-on statistics vs manual mean/median/stdev lab: real ops/s for fmean, sum/len, and sorted mid versus the stdlib, measured on Linux localhost (lab).
Hands-on bisect.insort vs linear vs set lab: real ops/s for mixed sorted-list insert and membership lookup workloads, measured on Linux localhost (lab).
Hands-on operator.attrgetter vs builtin getattr lab: real ops/s for extract and sort by attribute versus direct access, measured on Linux localhost only.
Hands-on collections.Counter vs dict tally lab: real ops/s for Counter.update, dict get-add, and defaultdict(int) token counting on Linux localhost (lab).
Hands-on bytes vs bytearray lab: real ops/s for append/extend/slice/copy and when copy dominates over mutate, benchmarked on Linux localhost for SREs.
Hands-on frozenset vs set vs list membership lab: real ops/s for build-once lookup-heavy paths and dict keys, benchmarked on Linux localhost for SREs.
