Replace font ID's for Brick SVG fonts

svg.py

import glob
import os
import re

fonts = glob.glob('/Users/alfred/Documents/Git/brick/fonts/*/*.svg')
for font in fonts:
    print 'Processing %s...' % font,
    font_id = os.path.basename(os.path.dirname(font))
    f = open(font, 'r')
    contents = f.read()
    contents = contents.replace('<svg>', '<svg version="1.1" xmlns="http://www.w3.org/2000/svg">')
    contents = re.sub(r'<font id="[a-zA-Z-]+"', '<font id="%s"' % font_id, contents)
    f.close()
    f = open(font, 'w')
    f.write(contents)
    f.close()
    print 'done.'