Pythonでcssファイルをフォーマットする

サンプルコード:
import string, sys
import re, StringIO

TAB=4
def format(ss):
f = open (ss, “r”)
data = f.read()
f.close()

dlen = len(data)
i = 0
buf = StringIO.StringIO()
start = 0
while i < dlen:
if data[i] == ‘{‘:

buf.write(data[start:i] + ‘ { ‘)
i = i + 1
start = i
elif data[i] == ‘}’:
last = string.strip(data[start:i])
if last:
buf.write(‘ ‘*TAB + last + ‘;’)
buf.write(‘ } ‘)
i = i + 1
start = i

elif data[i] == ‘;’:
line = string.strip(data[start:i])

buf.write(‘ ‘*TAB + line + ‘; ‘)
i = i + 1
start = i

else:
i = i + 1
buf.write(data[start:i+1])

return buf.getvalue()

if __name__ == ‘__main__’:
if len(sys.argv) == 1:
print ‘usage: cssformat.py filename’
sys.exit()

ret = format(sys.argv[1])
print ret