subprocess stdin encoding

[yc]

I have a encoding problem during using of subprocess. The input is a
string with UTF-8 encoding.

the code is:

tokenize =
subprocess.Popen(tok_command,stdin=subprocess.PIPE,stdout=subprocess.PIPE,close_fds=True,shell=True)

(tokenized_text,errs) = tokenize.communicate(t)

the error is:
  File "/usr/local/python/lib/python2.5/subprocess.py", line 651, in
communicate
    return self._communicate(input)
  File "/usr/local/python/lib/python2.5/subprocess.py", line 1115, in
_communicate
    bytes_written = os.write(self.stdin.fileno(), input[:512])
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa9' in
position 204: ordinal not in range(128)


How I change the default encoding from "ascii" to "utf-8"?

Ying Chen