import re
import codecs
text = codecs.open('test.txt', encoding='utf-8')

def cs(text):
    for line in text:
        #...some other replacements with regex and normal characters.
        line = re.sub(ur'(u0f62u0f0b|u0f60u0f72u0f0b)/ES ', ur' 1',line)

    print line #I've tried leaving this out, but still only a blank file.


output_file = codecs.open('outputtest.txt', 'w', encoding='utf-8')
output_file.write(line)
output_file.close()

འདུལ་//X བ་/E ག་/S བཞུགས་/S སོ/S །/S <utt>
འདུལ་/X བ་/Y གཞི/E །/S <utt>
བམ་/X པོ་/E ལྔ་/S བཅུ་/S ལྔ་/X པ/E །/S <utt>
ཐུན་/X མོང་/E མ་/S ཡིན་/X པ་/E གང་/S ཞེ་/S ན/S །/S <utt>