lackpy-lang 0.12.0

The lackpy language: grammar, validator, grader, and spec — the pure-language leaf, with no runtime dependencies.

lackpy-lang

The lackpy language as a standalone, dependency-free distribution: the grammar (allowed/forbidden AST nodes, builtins, names), the validator, the grader, and the language spec. This is the pure-language leaf of lackpy — it has no runtime dependencies and pulls in none of lackpy's interpreters, policy layer, service, or MCP surface.

Why a separate package?

So consumers that only need to reason about lackpy programs — validate them, grade them, or describe the language — can do so without installing lackpy's full runtime. For example, a coaching/policy tool can classify a generated program against the canonical grammar by importing lackpy.lang directly, instead of mirroring the definitions by hand.

from lackpy.lang import validate, compute_grade, get_spec

result = validate("x = sorted(items)\nprint(x[0])")
assert result.valid

Namespace

lackpy-lang and lackpy share the lackpy namespace via PEP 420 (implicit namespace packages): neither ships a top-level lackpy/__init__.py. Installing lackpy pulls in lackpy-lang automatically; installing lackpy-lang alone gives you exactly lackpy.lang.

Development (monorepo)

# editable install of both, from the lackpy repo root:
pip install -e ./packages/lackpy-lang -e .