Reduce "resolucion" de un KML

reduce.py

#!/usr/bin/python

import re

f = open('municipio.kml', 'r')
line = f.readline()
while line:
    rline = line.rstrip()
    redata = re.match('<coordinates>(.*?)</coordinates>',line)
    if redata:
        rline = "<coordinates>"
        data = redata.groups()
        for datum in data:
            coords = re.split(' ', datum)
            i = 0
            for acoord in coords:
                if i % 2 == 0:
                        rline = rline + ' ' + acoord
                i = i+1
        rline = rline + "</coordinates>"
    print rline
    line = f.readline()

Tal vez tambien debería reducir un par de decimales...