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>>> def frac(n):
i = int(n)
f = round((n - int(n)), 4)
return (i, f)
>>> frac(53.45)
(53, 0.45) # A tuple
>>> def frmt(hour): # You can rewrite it with 'while' if you wish
hours, _min = frac(hour)
minutes, _sec = frac(_min*60)
seconds, _msec = frac(_sec*60)
return "%s:%s:%s"%(hours, minutes, seconds)
>>> frmt(72.345)
'72:20:42'
>>> l = [72.345, 72.629, 71.327]
>>> map(frmt, l)
['72:20:42', '72:37:44', '71:19:37']