pygha 0.3.1

A Python-native CI/CD framework for defining, testing, and transpiling pipelines.

A Python-native CI/CD framework for defining, testing, and transpiling pipelines to GitHub Actions.

Read the Full Documentation

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Installation

PyPI

You can install pygha via pip:

pip install pygha

Example: Define a CI Pipeline with pygha

Below is an example of a Python-defined pipeline that mirrors what most teams use in production — build, lint, test, coverage, and deploy — all orchestrated through pygha.

from pygha import job, default_pipeline
from pygha.steps import run, checkout, uses

# Configure the default pipeline to run on main push and PRs
default_pipeline(on_push=["main"], on_pull_request=True)

@job(
    name="test",
    matrix={"python": ["3.11", "3.12", "3.13"]},
)
def test_matrix():
    """Run tests across multiple Python versions."""
    checkout()

    # Use the matrix variable in your step arguments
    setup_python("${{ matrix.python }}", cache="pip")

    run("pip install .[dev]")
    run("pytest")

@job(name="deploy", depends_on=["test"])
def deploy():
    """Build and publish if tests pass."""
    checkout()
    setup_python("3.11", cache="pip")

    run("pip install build twine")
    run("python -m build")
    run("twine check dist/*")

Generating Workflows (CLI)

Once you have defined your pipelines (by default, pygha looks for files matching pipeline_*.py or *_pipeline.py in a .pipe directory), use the CLI to generate the GitHub Actions YAML files.

# Default behavior: Scans .pipe/ and outputs to .github/workflows/
pygha build

Options

• --src-dir: Source directory containing your Python pipeline definitions (default: .pipe).

• --out-dir: Output directory where the generated YAML files will be saved (default: .github/workflows).

• --clean: Automatically deletes YAML files in the output directory that are no longer registered in your pipelines. This is useful when you rename or remove pipelines.

  If you have a manually created workflow file in your output directory that you want to preserve (e.g., manual-deploy.yml), add # pygha: keep to the first 10 lines of that file. The CLI will skip deleting it.

Advanced: Conditional Logic

pygha allows you to write conditional workflows using Python syntax instead of raw YAML strings.

Job-Level Conditions

Use the @run_if decorator to skip entire jobs based on context.

from pygha.decorators import run_if
from pygha.expr import github

@job(name="nightly-scan")
@run_if(github.event_name == "schedule")
def security_scan():
    """Only runs on scheduled events."""
    ...

Step-Level Conditions

Use the when context manager to group steps that should only run under certain conditions. Nested conditions are automatically AND-ed together.

from pygha.steps import when
from pygha.expr import runner, always, failure

@job
def conditional_steps():
    # Simple check
    with when(runner.os == 'Linux'):
        run("sudo apt-get update")

    # Status check helper (runs even if previous steps failed)
    with when(always()):
        run("echo 'Cleanup...'")

    # Nested check: (failure()) AND (runner.os == 'Linux')
    with when(failure()):
        with when(runner.os == 'Linux'):
            run("echo 'Linux build failed!'")