TODO docs.

def format_degrees(degrees, fmt=DEGREES_FORMAT, symbols=None):
    """
    TODO docs.
    """
    symbols = symbols or ASCII_SYMBOLS
    arcminutes = units.arcminutes(degrees=degrees - int(degrees))
    arcseconds = units.arcseconds(arcminutes=arcminutes - int(arcminutes))
    format_dict = dict(
        symbols,
        degrees=degrees,
        minutes=abs(arcminutes),
        seconds=abs(arcseconds)
    )
    return fmt % format_dict