Function _findwheel

Lib/test/support/__init__.py:2577–2595

Try to find a wheel with the package specified as pkgname. If set, the wheels are searched for in WHEEL_PKG_DIR (see ensurepip). Otherwise, they are searched for in the test directory.

(pkgname)

@functools.cache
def _findwheel(pkgname):
    """Try to find a wheel with the package specified as pkgname.

    If set, the wheels are searched for in WHEEL_PKG_DIR (see ensurepip).
    Otherwise, they are searched for in the test directory.
    """
    wheel_dir = sysconfig.get_config_var('WHEEL_PKG_DIR') or os.path.join(
        TEST_HOME_DIR, 'wheeldata',
    )
    filenames = os.listdir(wheel_dir)
    filenames = sorted(filenames, reverse=True)  # approximate "newest" first
    for filename in filenames:
        # filename is like 'setuptools-{version}-py3-none-any.whl'
        if not filename.endswith(".whl"):
            continue
        prefix = pkgname + '-'
        if filename.startswith(prefix):
            return os.path.join(wheel_dir, filename)
    raise FileNotFoundError(f"No wheel for {pkgname} found in {wheel_dir}")


# Context manager that creates a virtual environment, install setuptools in it,