Python (2.7) Normalize Japanese Text File. (Hankaku, Zenkaku)

normalize.py

import unicodedata
filename = 'somefilename.txt'
f = open(file, 'r')
r = f.read()
f.close()
ur = r.decode('utf-8')
n = unicodedata.normalize('NFKC', ur)
outfile = 'outfile.txt'
f = open(outfile, 'wb')
f.write(n.encode('utf-8'))
f.close()