$ python py-to-po es
Traceback (most recent call last):
  File "py-to-po", line 76, in ?
    do(lang)
  File "py-to-po", line 25, in do
    fd.write(r"""# MoinMoin translation
UnicodeEncodeError: 'ascii' codec can't encode character u'\xf1' in position 304: ordinal not in range(128)