teptris-py — TOML for Python at libleptris speed
A native C-extension binding (no ctypes, no fallback) over
libteptris — the TOML counterpart
of leptris-py (XML) and yeptris-py (YAML). API shape mirrors
tomllib/tomli (loads/load raising TOMLDecodeError) plus a
dumps writer in the tomli_w spirit. Datetime mapping mirrors
tomllib: aware/naive datetime, date, time.
Both directions are native: dumps walks the object tree in C
through the builder API and emits via the shared engine emitter —
3.5×–14.2× faster than tomli_w on every benchmark shape. The engine
implements the TOML 1.1 draft grammar (a strict superset of 1.0)
with 100% toml-test conformance, and parses at ≥3× the best C/C++
competitor on every shape.
Performance (end-to-end, Python tier)
Best-of-12 runs on a GitHub ubuntu-latest runner (python 3.12),
2026-09-21, over the generated bench corpus (~700 KB per shape). The
full per-shape table regenerates on every main push via the
lang-tier lane.
| Shape | teptris | tomllib (stdlib) | tomlkit (pure) | rtoml (rust) |
|---|---|---|---|---|
| array_heavy | 6.8 ms / 107 MB/s | 236 ms / 3.1 MB/s | 1,740 ms / 0.4 MB/s | 34 ms / 21 MB/s |
| cargo_like | 3.8 ms / 94 MB/s | 100 ms / 3.5 MB/s | 1,074 ms / 0.3 MB/s | 18 ms / 20 MB/s |
| datetime_heavy | 26.1 ms / 41 MB/s | 227 ms / 4.8 MB/s | 1,680 ms / 0.6 MB/s | 40 ms / 27 MB/s |
| deep_tables | 2.2 ms / 109 MB/s | 82 ms / 3.0 MB/s | 14,713 ms / 0.0 MB/s | 13 ms / 18 MB/s |
| mixed | 5.5 ms / 80 MB/s | 150 ms / 2.9 MB/s | 1,385 ms / 0.3 MB/s | 27 ms / 16 MB/s |
| scalar_float | 12.7 ms / 115 MB/s | 310 ms / 4.7 MB/s | 2,243 ms / 0.7 MB/s | 61 ms / 24 MB/s |
| scalar_int | 11.8 ms / 108 MB/s | 300 ms / 4.3 MB/s | 2,038 ms / 0.6 MB/s | 54 ms / 24 MB/s |
End to end (parse + materialize into Python objects): 4.8-6x rtoml (the rust-backed incumbent), 19-42x the stdlib's tomllib, and hundreds of times tomlkit per shape. rtoml numbers include its own object construction; both libraries materialize fully.
Packaging
pip install teptris resolves one of 10 cp39-abi3 wheels —
manylinux/musllinux x86_64, aarch64 and armv7l (32-bit ARM, built
under qemu), macOS arm64 and x86_64, Windows AMD64 and ARM64 —
covering every CPython >= 3.9 including future minors. The extension statically links libteptris, so each
wheel is a single self-contained module (no shared-library chain).
Linux wheels build the engine inside each container via cibuildwheel
so musllinux links musl; the manylinux wheels carry the maximal tag
set (glibc >= 2.17).
Every wheel also carries the engine C SOURCE at teptris/_engine
(beside the compiled extension) — the recompile path for rebuilding
against your own environment. The sdist vendors the same tree and
compiles automatically at install.
Every other platform (FreeBSD, Solaris/illumos, any CPython on an exotic arch) installs the sdist, which vendors the engine and compiles it with the installing interpreter's compiler — a C compiler is required, and the build fails loudly without one.
Many-small batch (loads_batch)
Parse a list of TOML documents in ONE C call (teptris_parse_batch):
docs = teptris.loads_batch([toml_str_a, toml_str_b, toml_str_c])
# => [dict, dict, dict] — same datetime contract as loads()
The first failing document raises TOMLDecodeError carrying its
line/column. Honest perf shape (benchmark/batch_tier.py): per-doc
loads in a tight loop is faster on every measured shape (6.3x on
2000 tiny docs, 3.2x medium, 1.3x large — CPython's per-call overhead
amortizes better than the batch's scratch + object pressure). Use
loads_batch for the single API surface, one C crossing, and the
per-doc error report — not for speed.
Lazy load (loads_lazy)
When most of the parsed tree is going to be ignored, loads_lazy
returns a LazyNode wrapper that materializes host objects only along
the paths actually accessed:
doc = teptris.loads_lazy(big_toml)
# one parse, no dicts/lists materialized yet
sku = doc["items"][0]["sku"].value() # walks the path; scalars
# materialize at .value()
rest = doc["items"] # returns a LazyNode for the array
for it in rest:
print(it["sku"].value())
# flatten eagerly if you want the same dict-tree shape as loads()
flat = doc.to_dict()
LazyNode exposes kind() ('table' | 'array' | 'scalar'), value()
(scalars only — errors on containers), len() (containers), iteration
(tables yield (key, LazyNode) pairs; arrays yield LazyNodes),
[] (table key or array index — None for absent), and to_dict() /
to_list() for eager flattening. Datetime values materialize via the
same datetime.datetime / date / time contract as loads(). The
document and the borrowed-bytes input are kept alive by the wrapper
until GC.
Same datetime contract as loads(). The eager path is the floor for
"flatten everything" workloads; the lazy path is the win for "parse
once, touch a small subset."
Development
setup.py links the engine statically when it finds
libteptris.a/teptris.lib under TEPTRIS_LIBDIR (what the wheels
ship); otherwise it falls back to the shared library with an rpath to
its build tree. Point TEPTRIS_INCLUDE/TEPTRIS_LIBDIR at a C
checkout's build and run the suite:
cmake -B ../teptris/build -S ../teptris \
-DCMAKE_BUILD_TYPE=Release -DTEPTRIS_BUILD_SHARED=OFF -DTEPTRIS_BUILD_STATIC=ON
cmake --build ../teptris/build
TEPTRIS_INCLUDE=../teptris/src/include TEPTRIS_LIBDIR=../teptris/build/src \
python3 setup.py build_ext --inplace
PYTHONPATH=src python3 -m unittest discover -s tests -v
Publishing and version numbers are USER release decisions.
1 maintainer
Metadata
1 maintainer
Release files for teptris 0.2.23
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Built distributions (wheels)
Total release size: 2.1 MB
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