py-rattler-build 0.62.0

The fastest way to build conda packages programatically

py-rattler-build

Python bindings for Rattler-Build, the fast conda package builder.

py-rattler-build lets you build, inspect, test, and upload conda packages directly from Python — no subprocess calls needed.

Quick start

Build a package from a recipe

from rattler_build import Stage0Recipe, VariantConfig

recipe = Stage0Recipe.from_file("recipe.yaml")
results = recipe.run_build()

for result in results:
    print(f"Built {result.name} {result.version} in {result.build_time:.1f}s")
    for pkg in result.packages:
        print(f"  {pkg}")

Render and build with variants

from rattler_build import Stage0Recipe, VariantConfig

recipe = Stage0Recipe.from_file("recipe.yaml")
rendered_variants = recipe.render(VariantConfig())

for variant in rendered_variants:
    result = variant.run_build()

Inspect an already built package

from rattler_build import Package

pkg = Package.from_file("mypackage-1.0.0-py312h0_0.conda")
print(f"{pkg.name} {pkg.version} ({pkg.platform})")
print(f"Dependencies: {pkg.depends}")
print(f"Files: {len(pkg.files)}")

Test a package

from rattler_build import Package

pkg = Package.from_file("mypackage-1.0.0-py312h0_0.conda")
results = pkg.run_tests()

Generate a recipe from PyPI

from rattler_build import generate_pypi_recipe

recipe_yaml = generate_pypi_recipe("requests", version="2.31.0")
print(recipe_yaml)

Build with progress reporting

from rattler_build import Stage0Recipe, VariantConfig
from rattler_build.progress import RichProgressCallback

recipe = Stage0Recipe.from_file("recipe.yaml")
rendered_variants = recipe.render(VariantConfig())

for variant in rendered_variants:
    with RichProgressCallback(show_logs=True) as callback:
        result = variant.run_build(progress_callback=callback)

Documentation

For the full reference, check out our website.