Function get_preferred_scheme

Lib/sysconfig/__init__.py:310–319

(key)

def get_preferred_scheme(key):
    if key == 'prefix' and sys.prefix != sys.base_prefix:
        return 'venv'
    scheme = _get_preferred_schemes()[key]
    if scheme not in _INSTALL_SCHEMES:
        raise ValueError(
            f"{key!r} returned {scheme!r}, which is not a valid scheme "
            f"on this platform"
        )
    return scheme


def get_default_scheme():