def encode_multipart_formdata(fields, files):
    """fields is a sequence of (name, value) elements for regular form fields.
    files is a sequence of (name, filename, value) elements for data to be uploaded as files
    Return (content_type, body) ready for httplib.HTTP instance
    """
    BOUNDARY = "GlobalNumberOfPiratesDecreasing-GlobalTemperatureIncreasing"
    CRLF = "\r\n"
    request = []
    for (key, value) in fields:
        request.extend(
            [
                "--" + BOUNDARY,
                'Content-Disposition: form-data; name="%s"' % key,
                "",
                value,
            ]
        )
    for (key, filename, value) in files:
        request.extend(
            [
                "--" + BOUNDARY,
                'Content-Disposition: form-data; name="%s"; filename="%s"'
                % (key, filename),
                "Content-Type: %s" % get_content_type(filename),
                "",
                value,
            ]
        )
    request.append("--" + BOUNDARY + "--")
    request.append("")
    body = CRLF.join(request)
    content_type = "multipart/form-data; boundary=%s" % BOUNDARY
    return content_type, body