How may I convert the seconds back to minutes, hours, days, months, years, in Python ?

Here is some code from convert.py:

unit_to_seconds = {
        'seconds':1,
        'minutes':60,
        'hours':60*60,
        'days':24*60*60,
        'weeks':7*24*60*60,
        'months':31*24*60*60,
        'years':365.25*24*60*60,
        }

implemented it by my own.

see http://bazaar.launchpad.net/~gotwig/lens-cooking/lens-cooking/revision/35