PEP 517 specifies a standard API for systems which build Python packages.
This package contains wrappers around the hooks specified by PEP 517. It provides:
- A mechanism to call the hooks in a subprocess, so they are isolated from the current process.
- Fallbacks for the optional hooks, so that frontends can call the hooks without checking which are defined.
Run the tests with pytest or tox.
Usage—you are responsible for ensuring build requirements are available:
import os
import toml
from pep517.wrappers import Pep517HookCaller
src = 'path/to/source' # Folder containing 'pyproject.toml'
with open(os.path.join(src, 'pyproject.toml')) as f:
build_sys = toml.load(f)['build-system']
print(build_sys['requires']) # List of static requirements
# The caller is responsible for installing these and running the hooks in
# an environment where they are available.
hooks = Pep517HookCaller(
src,
build_backend=build_sys['build-backend'],
backend_path=build_sys.get('backend-path'),
)
config_options = {} # Optional parameters for backend
# List of dynamic requirements:
print(hooks.get_requires_for_build_wheel(config_options))
# Again, the caller is responsible for installing these build requirements
destination = 'also/a/folder'
whl_filename = hooks.build_wheel(destination, config_options)
assert os.path.isfile(os.path.join(destination, whl_filename))For now, pep517 also contains higher-level functions which install the build dependencies into a temporary environment and build a wheel/sdist using them. This is a rough implementation, e.g. it does not do proper build isolation. The PyPA build project is recommended as an alternative, although it's still quite young in October 2020. This layer of functionality in pep517 is now deprecated, but won't be removed for some time, as there is code relying on it.
High level usage, with build requirements handled:
import os
from pep517.envbuild import build_wheel, build_sdist
src = 'path/to/source' # Folder containing 'pyproject.toml'
destination = 'also/a/folder'
whl_filename = build_wheel(src, destination)
assert os.path.isfile(os.path.join(destination, whl_filename))
targz_filename = build_sdist(src, destination)
assert os.path.isfile(os.path.join(destination, targz_filename))To test the build backend for a project, run in a system shell:
python3 -m pep517.check path/to/source # source dir containing pyproject.tomlTo build a backend into source and/or binary distributions, run in a shell:
python -m pep517.build path/to/source # source dir containing pyproject.tomlAll of this high-level functionality is deprecated.
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