Hands-on hashlib md5 vs blake2b vs sha1/sha256 lab: real MB/s checksum throughput for content-integrity hashing, measured on Linux localhost for SREs.
Hands-on glob.glob vs Path.rglob vs os.walk lab: real files/s for recursive file listing on a modest fixture tree, measured on Linux localhost for SREs.
Hands-on json.dumps separators vs indent lab: real time and byte-size tradeoffs for compact vs pretty JSON encoding, measured on Linux localhost (lab).
Hands-on shutil.copyfile vs manual file copy lab: real MB/s versus open/read/write and Path.read_bytes on local disk, measured on Linux localhost (lab).
Hands-on str.translate vs replace vs re.sub lab: real ops/s for character delete and map scrubbing on mid-size strings, measured on Linux localhost (lab).
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 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 operator.itemgetter vs lambda sort-key lab: real ops/s for extract and list.sort on tuples, dicts, and objects, measured on Linux localhost (lab).
Hands-on ThreadPoolExecutor vs sequential lab: real wall-time speedup for I/O sleep workloads plus GIL CPU contrast, measured on Linux localhost (lab).
Hands-on itertools vs pure Python loops lab: chain, islice, and accumulate vs equivalent for-loops with real ops/s, measured on Linux localhost (lab).
Hands-on collections.deque vs list queue lab: real FIFO ops/s for append/popleft vs list.pop(0) at several prefill sizes on Linux localhost (eng lab).