import httplib, mimetypesdef post_multipart(host, selector, fields, files):"""
    Post fields and files to an http host as multipart/form-data.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 filesReturn the server's response page."""
    content_type, body = encode_multipart_formdata(fields, files)h = httplib.HTTP(host)h.putrequest('POST', selector)h.putheader('content-type', content_type)h.putheader('content-length', str(len(body)))h.endheaders()h.send(body)errcode, errmsg, headers = h.getreply()return h.file.read()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 filesReturn (content_type, body) ready for httplib.HTTP instance"""
    BOUNDARY = '----------ThIs_Is_tHe_bouNdaRY_$'CRLF = '\r\n'L = []for (key, value) in fields:L.append('--' + BOUNDARY)L.append('Content-Disposition: form-data; name="%s"' % key)L.append('')L.append(value)for (key, filename, value) in files:L.append('--' + BOUNDARY)L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))L.append('Content-Type: %s' % get_content_type(filename))L.append('')L.append(value)L.append('--' + BOUNDARY + '--')L.append('')body = CRLF.join(L)content_type = 'multipart/form-data; boundary=%s' % BOUNDARYreturn content_type, bodydef get_content_type(filename):return mimetypes.guess_type(filename)[0] or 'application/octet-stream'