# mode: run

# tag: pep489

import os.path

module_spec = __spec__

module_file = __file__

def check_spec(spec=__spec__):

    """

    >>> check_spec()

    """

    assert __spec__ is not None

    assert __spec__ is spec

    assert __name__

    assert __name__ == spec.name

    assert spec.loader is not None

    assert spec.loader is __loader__

    assert not spec.parent

    assert not __package__

    assert spec.origin

    assert spec.origin == module_file

    assert spec.origin == __file__

    assert os.path.basename(spec.origin).startswith(__name__)

# validate that ModuleSpec is already complete at module initialisation time

check_spec()

check_spec(__spec__)

check_spec(module_spec)

def file_in_module():

    """

    >>> print(file_in_module())

    mod__spec__

    """

    return os.path.basename(module_file).split('.', 1)[0]

def file_in_function():

    """

    >>> print(file_in_function())

    mod__spec__

    """

    return os.path.basename(__file__).split('.', 1)[0]