from decimal import Decimal as Dec

Deg = namedtuple('Deg', ['hh', 'mm', 'ss'])

def guess(inp):
    if isinstance(inp, Dec):
        return inp

    if '-' in instr:
        deg, mm, ss = instr.split('-')
        ddeg, dmm, dss = Dec(deg), Dec(mm), Dec(ss)
        return deg + dmm/60 + dss/3600
    else:
        return Dec(instr)

def hms(deg):
    assert isinstance(deg, Dec)
    pdeg, pmm = divmod(deg, 1)
    pmm = pmm * Dec(60)
    pmm, pss = divmod(pmm, 1)
    pss = pss * Dec(60)
    return Deg(pdeg, pmm, pss)