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datagen, headers = multipart_encode({"image1": open("image.png", "rb")})
response = opener.open(request, datagen, headers)

Traceback (most recent call last):
  File "/home/tmp/poster-0.8.0/test.py", line 20, in <module>
    response = opener.open(request, datagen, headers)
  File "/usr/local/lib/python3.2/urllib/request.py", line 366, in open
    response = self._open(req, data)
  File "/usr/local/lib/python3.2/urllib/request.py", line 384, in _open
    '_open', req)
  File "/usr/local/lib/python3.2/urllib/request.py", line 344, in _call_chain
    result = func(*args)
  File "/usr/local/lib/python3.2/urllib/request.py", line 1140, in http_open
    return self.do_open(http.client.HTTPConnection, req)
  File "/usr/local/lib/python3.2/urllib/request.py", line 1122, in do_open
    h.request(req.get_method(), req.selector, req.data, headers)
  File "/usr/local/lib/python3.2/http/client.py", line 964, in request
    self._send_request(method, url, body, headers)
  File "/usr/local/lib/python3.2/http/client.py", line 1002, in _send_request
    self.endheaders(body)
  File "/usr/local/lib/python3.2/http/client.py", line 960, in endheaders
    self._send_output(message_body)
  File "/usr/local/lib/python3.2/http/client.py", line 805, in _send_output
    self.send(msg)
  File "/usr/local/lib/python3.2/http/client.py", line 743, in send
    self.connect()
  File "/usr/local/lib/python3.2/http/client.py", line 721, in connect
    self.timeout, self.source_address)
  File "/usr/local/lib/python3.2/socket.py", line 386, in create_connection
    sock.settimeout(timeout)
TypeError: a float is required

  File "/home/python3/urllib_test/start_file.py", line 70, in __str__
    return '\r\n'.join(flattened)
TypeError: sequence item 12: expected str instance, bytes found

              'Content-Type: %s' % content_type,
              '',
              body,

              'Content-Type: %s' % content_type,
              '',
              str(body),

    raise TypeError("POST data should be bytes"
TypeError: POST data should be bytes or an iterable of bytes. It cannot be str.

    request.add_data(bytes(body, 'utf8'))