serpentium
Drop-in performance accelerators for CPython, bundled.
pip install serpentium and several hot paths in the standard library transparently start running on faster native code — no code changes, and no import required: serpentium auto-enables at interpreter startup.
import random
from datetime import datetime
import html
deck = list(range(52))
random.shuffle(deck) # ~8x faster, served by Rust (randium)
datetime.strptime("2026-06-07", "%Y-%m-%d") # faster, fully stdlib-compatible (datetimium)
html.unescape("Tom & Jerry") # ~4x faster, served by Rust (htmlium)
Serpentium aims for every accelerator to be a true drop-in: same results, down to
error messages. CPython's own tests for the modules it touches pass with serpentium
installed (python tools/cpython_suite.py).
What's inside
| Element | Main target | Backend |
|---|---|---|
| randium | the random module — random(), randint/randrange/_randbelow, shuffle |
Rust |
| datetimium | datetime.strptime (locale-independent formats) |
Python |
| htmlium | html.escape, html.unescape (and HTMLParser, which calls unescape) |
Rust |
| floatium | repr(float), str(float), f"{x:.3f}", float(str) |
C++ (dep) |
| copium | copy.deepcopy |
dep |
randium, datetimium and htmlium ship inside serpentium; floatium and copium
are separately-maintained packages pulled in as dependencies.
Benchmarks
CPython 3.14, release build. serpentium wins where a whole Python loop moves to native code (shuffle, deepcopy, entity decoding); per-call primitives merely tie CPython's hand-tuned C (the honest story — see INTERNALS.md).
| Operation | stdlib | serpentium | speedup |
|---|---|---|---|
random.shuffle(list[1000]) |
158 µs | 19 µs | 8.3× |
copy.deepcopy (pyperformance bm_deepcopy) |
7.8 µs | 1.3 µs | 6.0× |
html.unescape (text with entities) |
4.3 µs | 0.95 µs | 4.5× |
html.escape (clean paragraph) |
208 ns | 62 ns | 3.3× |
datetime.strptime("%Y-%m-%d") |
3.77 µs | 1.54 µs | 2.4× |
f"{x:.3f}" (float formatting) |
348 ns | 160 ns | 2.2× |
datetime.strptime("%Y-%m-%d %H:%M:%S") |
4.67 µs | 2.75 µs | 1.7× |
random.sample(10k, 100) |
20.7 µs | 17.5 µs | 1.2× |
random.randint(1, 6) |
157 ns | 150 ns | 1.05× |
random.random() |
54 ns | 51 ns | 1.04× |
html.unescape (no entities) |
42 ns | 42 ns | 1.0× |
Control
Auto-enabled by default. To opt out:
SERPENTIUM_AUTOPATCH=0 python ... # per-process
python -m serpentium disable # persistent (writes a marker file)
python -m serpentium status # show what's active
Or drive it explicitly from code:
import serpentium
serpentium.install(randium=True, datetimium=True, htmlium=True) # toggle individually
serpentium.uninstall() # restore the stdlib
Documentation
Design, compatibility guarantees, the in-place-patching mechanism, the test strategy, and building from source are in INTERNALS.md.
License
Dual-licensed under either MIT or Apache-2.0, at your option.
1 maintainer
Metadata
1 maintainer
Release files for serpentium 0.0.4
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| serpentium-0.0.4.tar.gz | 65.2 kB | Details |
Built distributions (wheels)
Total release size: 2.8 MB
Release files / serpentium-0.0.4.tar.gz
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| Tags | Source |
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