Python Random Function without using random module

I need to write the function -

random_number(minimum,maximum)

Without using the random module and I did this:

import time

def random_number(minimum,maximum):
    now = str(time.clock())
    rnd = float(now[::-1][:3:])/1000
    return minimum + rnd*(maximum-minimum)

I am not sure this is fine.. is there a known way to do it with the time?