def versions_from_parentdir(parentdir_prefix, root, verbose):
    """Try to determine the version from the parent directory name.

    Source tarballs conventionally unpack into a directory that includes both
    the project name and a version string. We will also support searching up
    two directory levels for an appropriately named parent directory
    """
    rootdirs = []

    for _ in range(3):
        dirname = os.path.basename(root)
        if dirname.startswith(parentdir_prefix):
            return {
                "version": dirname[len(parentdir_prefix) :],
                "full-revisionid": None,
                "dirty": False,
                "error": None,
                "date": None,
            }
        rootdirs.append(root)
        root = os.path.dirname(root)  # up a level

    if verbose:
        print(
            "Tried directories %s but none started with prefix %s"
            % (str(rootdirs), parentdir_prefix)
        )
    raise NotThisMethod("rootdir doesn't start with parentdir_prefix")
Try to determine the version from the parent directory name.

    Source tarballs conventionally unpack into a directory that includes both
    the project name and a version string. We will also support searching up
    two directory levels for an appropriately named parent directory
    
cupynumeric/_version.py