Python 2.6.5: Divide timedelta with timedelta

I'm trying to divide one timedelta object with another to calculate a server uptime:

>>> import datetime
>>> installation_date=datetime.datetime(2010,8,01)
>>> down_time=datetime.timedelta(seconds=1400)
>>> server_life_period=datetime.datetime.now()-installation_date
>>> down_time_percentage=down_time/server_life_period
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for /: 'datetime.timedelta' 
           and 'datetime.timedelta'

I know this has been solved in Python 3.2, but is there a convenient way to handle it in prior versions of Python, apart from calculating the number of microseconds, seconds and days and dividing?

Thanks,

Adam