def _signature_map(map_dict, parsed_sig):
    """Map values found in parsed gufunc signature.

    Parameters
    ----------
    map_dict : dict of str to int
        Mapping from `str` dimension names to `int`. All strings in
        `parsed_sig` must have entries in `map_dict`.
    parsed_sig : list-like of tuples of str
        gufunc signature that has already been parsed, e.g., using
        `parse_gufunc_signature`.

    Returns
    -------
    shapes : list of tuples of int
        list of tuples where each tuple is the shape of an argument.

    """
    shapes = [tuple(map_dict[k] for k in arg) for arg in parsed_sig]
    return shapes