ktav (Python)

License: MIT OR Apache-2.0

Python bindings for Ktav — a plain configuration format. JSON-shape, no quotes, no commas, dotted keys. Powered by Rust under the hood.

Languages: English · Русский · 简体中文

Playground: convert JSON / YAML / TOML / INI ⇄ Ktav in your browser at ktav-lang.github.io.

Specification: this package implements Ktav. The format is versioned and maintained independently of this package — see ktav-lang/spec for the formal document.

Install

pip install ktav

Wheels are published for every major platform and every supported Python version:

Linux (manylinux + musllinux) — x86_64, aarch64
macOS — x86_64, arm64 (Apple Silicon)
Windows — x64, arm64

Python 3.9+ is required. The wheels target the stable ABI (abi3-py39), so a single wheel per platform serves every supported CPython release.

If no prebuilt wheel matches your platform, pip falls back to the source distribution and compiles it locally — you need a Rust toolchain (rustup) and the Python development headers.

Quick start

Parse — read typed fields straight off the dict

import ktav

src = """
service: web
port: 8080
ratio: 0.75
tls: true
tags: [
    prod
    eu-west-1
]
db.host: primary.internal
db.timeout: 30
"""

cfg = ktav.loads(src)

service: str = cfg["service"]
port: int = cfg["port"]
ratio: float = cfg["ratio"]
tls: bool = cfg["tls"]
tags: list[str] = cfg["tags"]
db_host: str = cfg["db"]["host"]
db_timeout: int = cfg["db"]["timeout"]

Walk — dispatch on the runtime type

for k, v in cfg.items():
    if v is None:
        kind = "null"
    elif isinstance(v, bool):
        kind = f"bool={v}"  # bool first — True is also an int!
    elif isinstance(v, int):
        kind = f"int={v}"
    elif isinstance(v, float):
        kind = f"float={v}"
    elif isinstance(v, str):
        kind = f"str={v!r}"
    elif isinstance(v, list):
        kind = f"array({len(v)})"
    elif isinstance(v, dict):
        kind = f"object({len(v)})"
    print(f"{k} -> {kind}")

Build & render — construct a document in code

doc = {
    "name": "frontend",
    "port": 8443,
    "tls": True,
    "ratio": 0.95,
    "upstreams": [
        {"host": "a.example", "port": 1080},
        {"host": "b.example", "port": 1080},
    ],
    "notes": None,
}
text = ktav.dumps(doc)
# name: frontend
# port: 8443
# tls: true
# ratio: 0.95
# upstreams: [
#     { host: a.example  port: 1080 }
#     { host: b.example  port: 1080 }
# ]
# notes: null

A complete runnable version lives in examples/basic.py.

Four entry points mirror the standard library json module:

Function	Purpose
`ktav.loads(s)`	Parse a Ktav string (or UTF-8 `bytes`).
`ktav.dumps(obj)`	Serialise a native Python value.
`ktav.load(fp)`	Parse from a file-like object.
`ktav.dump(obj, fp)`	Serialise to a file-like object.

load / dump accept both text-mode and binary-mode files.

For validation at trust boundaries, ktav.loads_strict(s) applies the specification's canonical-scalar rules and raises KtavDecodeError for a lossy scalar spelling. Canonical writer forms such as 1e-3 and 1e10 are accepted and produce the same native values as loads.

Type mapping

Ktav	Python
`null`	`None`
`true` / `false`	`bool`
bare integer	`int`
bare decimal	`float`
other scalar	`str`
`[ ... ]`	`list`
`{ ... }`	`dict`

Ktav types numbers by lexical form — a bare port: 8080 is an int, ratio: 0.5 a float, and anything that isn't a bare number stays a str. Force a numeric-looking value to stay a string with :: (zip:: 01007).

dict preserves insertion order (Python 3.7+ guarantee), matching the ordered-object semantics of Ktav.

Serialisation is the inverse:

Python int → bare integer (including arbitrary-precision bigints).
Python float → bare decimal (decimal point always present; NaN / ±Infinity are rejected — Ktav does not represent them).
Python tuple is accepted as an array, for symmetry with list.
Non-str keys in a dict raise KtavEncodeError.

Key escaping

Since spec 0.6.4 a literal . or : inside a key segment is written with a backslash:

a\.b: v        # key is the single segment "a.b" -> {"a.b": "v"}
a\:b: v        # key contains a colon            -> {"a:b": "v"}
x.y\.z: v      # split on the first dot only     -> {"x": {"y.z": "v"}}

A literal backslash in a key is \\.

Errors

import ktav

try:
    ktav.loads("x: [")
except ktav.KtavDecodeError as e:
    print("decode:", e)

try:
    ktav.dumps({"v": float("nan")})
except ktav.KtavEncodeError as e:
    print("encode:", e)

# Catching the base class catches either.
try:
    ktav.loads("a: 1\na: 2")
except ktav.KtavError:
    ...

Exception	Raised by	Base
`KtavError`	(base)	`Exception`
`KtavDecodeError`	`loads` / `load`	`KtavError`
`KtavEncodeError`	`dumps` / `dump`	`KtavError`

Philosophy

Ktav is intentionally small. Its five design principles (from spec/CONTRIBUTING.md):

Locality — a line's meaning does not depend on another line.
One sentence — any new rule fits in one sentence of the spec.
No whitespace sensitivity (line breaks aside).
No magic types — the format never decides "8080" means a number.
Explicit over clever — :: is verbose on purpose.

The Python bindings honour this: they add no schema inference, no auto-casting, no defaulting. If you want typing, you do it at the boundary with your own tool — pydantic, dataclasses, attrs — against the native Python structures this library returns.

Other Ktav implementations

spec — specification + conformance suite
rust — reference Rust crate (cargo add ktav); these Python bindings are a thin PyO3 wrapper around it
csharp — C# / .NET (dotnet add package Ktav)
golang — Go (go get github.com/ktav-lang/golang)
java — Java / JVM (io.github.ktav-lang:ktav on Maven Central)
js — JS / TS (npm install @ktav-lang/ktav)
php — PHP (composer require ktav-lang/ktav)

Versioning

This package follows Semantic Versioning with the pre-1.0 convention that a MINOR bump is breaking. The package version and the ktav crate version move together. ktav.__spec_version__ reports the Ktav format version this binding supports.

Development

See CONTRIBUTING.md for the dev setup, test layout, and the contribution workflow.

Support the project

The author has many ideas that could be broadly useful to IT worldwide — not limited to Ktav. Realizing them requires funding. If you'd like to help, please reach out at phpcraftdream@gmail.com.

License

MIT OR Apache-2.0. See LICENSE-MIT and LICENSE-APACHE.

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Upload date: Aug 23, 2026
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The following attestation bundles were made for ktav-0.6.4-cp39-abi3-macosx_10_12_x86_64.whl:

Publisher: release.yml on ktav-lang/python

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

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- Subject name: ktav-0.6.4-cp39-abi3-macosx_10_12_x86_64.whl
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0.6.4 This release

Aug 23, 2026 9 files

Jun 5, 2026 9 files

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Apr 24, 2026 9 files

ktav 0.6.4

ktav (Python)

Install

Quick start

Parse — read typed fields straight off the dict

Walk — dispatch on the runtime type

Build & render — construct a document in code

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