Registry / serialization / common-expression-language

common-expression-language

library0.6.0pypypiunverified

Python bindings for the Common Expression Language (CEL), providing evaluation, compilation, and CLI tools. Current version 0.5.6, requires Python >=3.11. Development is active with regular releases.

serialization

pip install common-expression-language

github ↗package ↗

INSTALL

IMPORT

SIG · COMMON-EXPRESSION-

common-expression-language

serializationpythonv0.6.0

Install

3.3s avg

Import

—

Disk

43MB

Pass rate

3/ 10

Env Coverage3 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.6.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

glibc

py 3.10

✕ build_error

py 3.11

✕ build_error

✓ 3.2s

py 3.12

✕ build_error

✓ 3.3s

py 3.13

✕ build_error

✓ 3.5s

py 3.9

✕ build_error

43MB installed

● package 43MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

evaluate

✓ from cel import evaluate

✗ from cel import evaluate

Basic usage: evaluate CEL expressions with optional context and custom functions.

from cel import evaluate # Evaluate a simple expression result = evaluate("1 + 2") print(result) # 3 # With a context context = {"age": 18} result = evaluate("age > 21", context) print(result) # False # Use custom Python functions def is_adult(age): return age > 21 context = {"is_adult": is_adult, "age": 18} result = evaluate("is_adult(age)", context) print(result) # False

cel --version

Debug

Known issues

gotchaPython types may be automatically converted to CEL types. Be cautious with dictionaries: dict subclasses are now properly handled (v0.5.6), but avoid relying on insertion order preservation in older versions.

fix

Upgrade to >=0.5.6 for dict subclass support.

affects: <0.5.6

breakingRust API breaking change in v0.5.0: cel-interpreter crate renamed to cel, function registration changed. Python API unaffected.

fix

No action needed for Python users; Rust bindings must update imports from cel_interpreter:: to cel:: and use IntoFunction trait.

affects: 0.5.0

gotchaOptional values are surfaced as cel.OptionalValue objects (since v0.5.5) instead of debug strings. Code relying on string output may break.

fix

Use .value property or isinstance() checks for OptionalValue.

affects: >=0.5.5

gotchaThe cel CLI command may conflict with other packages. On some systems, it might be shadowed by another executable named 'cel'.

fix

Call via python -m cel or check with `which cel`.

affects: all

Upgrade

Version history

0.6.0latest on PyPI · released May 12, 2026

Audit

Dependencies

cel-rust (cel crate)requiredRust core library for CEL evaluation

Agent activity

18 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/hardbyte/python-common-expression-language ↗

packagehttps://pypi.org/project/common-expression-language/ ↗