LESSCPY
Python LESS Compiler.
A compiler written in Python for the LESS language. For those of us not willing or able to have node.js installed in our environment. Not all features of LESS are supported. Some features will probably never be supported (JavaScript evaluation). This program uses PLY (Python Lex-Yacc) to tokenize / parse the input and is considerably slower than the Node.js compiler.
For more information on LESS:
Development files:
Supported features
- Variables
- String interpolation
- Mixins (nested, calls, closures, recursive)
- Guard expressions
- Parametered mixins (class / id)
@arguments- Nesting
- Escapes
~/e() - Expressions
- Keyframe blocks
- Color functions (lighten, darken, saturate, desaturate, spin, hue, mix, saturation, lightness)
- Other functions (round, increment, decrement, format
'%(...))
Differences from less.js
- All colors are auto-formatted to
#nnnnnn(for example,#f7e923) - Does not preserve CSS comments
Not supported
- JavaScript evaluation
Requirements
- Python 3.11+
pip
Installation
Install from PyPI:
pip install lesscpy
Local setup
Create and activate a virtual environment, then install test dependencies from pyproject.toml:
python -m venv .venv
source .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install -e ".[test]"
Build
Build source and wheel distributions:
python -m pip install --upgrade build
python -m build
Artifacts are created in dist/.
Test
Run unit tests:
pytest -v
Run lint checks:
flake8
Using tox
tox is useful for running the project test workflow in isolated environments and for reproducing the same multi-version checks used in CI.
Run all configured environments:
python -m pip install -e ".[tox]"
tox
Run a single environment:
tox -e py3.12
tox -e flake8
Compiler script usage
usage: lesscpy [-h] [-v] [-I INCLUDE] [-V] [-C] [-x] [-X] [-t] [-s SPACES]
[-o OUT] [-r] [-f] [-m] [-D] [-g] [-S] [-L] [-N]
target [output]
Python usage
from io import StringIO
import lesscpy
print(lesscpy.compile(StringIO("a { border-width: 2px * 3; }"), minify=True))
Output:
a{border-width:6px;}
License
See the LICENSE file.
Release files for lesscpy 0.15.2
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| lesscpy-0.15.2.tar.gz | 153.4 kB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| lesscpy-0.15.2-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 199.1 kB
Release files / lesscpy-0.15.2.tar.gz
| Download URL | lesscpy-0.15.2.tar.gz |
|---|---|
| Size | 153.4 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
4f6b7f34c22c5ce137e7ee280dcb1984ade0d500b6dab591d4a4d84252d18de9
|
|
BLAKE2b-256 checksum How to use checksums |
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Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
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PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jul 30, 2026.
Transparency logRelease files / lesscpy-0.15.2-py3-none-any.whl
| Download URL | lesscpy-0.15.2-py3-none-any.whl |
|---|---|
| Size | 45.7 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
39da3e9779674889fc67b50d16dff267677e7594cdc9da897e486f6244fd2b1b
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|
BLAKE2b-256 checksum How to use checksums |
759eac02bb38b217d657afe2edb8c9048d6f4008526d1b19e0e69f9fa5336aaa
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| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jul 30, 2026.
Transparency logSecurity for lesscpy 0.15.2
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
Full provenance
All 2 files in this release have been uploaded with provenance metadata.
Attestation for lesscpy-0.15.2.tar.gz
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jul 30, 2026.
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