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decimal numbers


hello,
i have been working on a python resistor calculator to let my class show what you can do with python.
now i have a script that makes the more speekable value of the resistance (res)

#if len(str(res)) > 9:
#  res2 = res / 1000000000
#  print "de weerstand is %s,%s giga ohms" % (res2)
#elif len(str(res)) > 6:
#  res2 = res / 1000000
#  print "de weerstand is %s,%s Mega ohm" % (res2)
#elif len(str(res)) > 3:
#  res2 = res / 1000
#  print "de weerstand is", res2,"kilo ohm"
#elif len(str(res)) < 4:
#  res2 = res
#  print "de weerstand is", res2,"ohm"

i commented it because it doesn't work (yet), when i have a resistance of 
9.9 Giga ohms it says it is 9 giga ohms. it seems to work with natural number, anyway of using decimals insted so that it says : the resistance is 9.9 Giga Ohms instead of 9 ?