+try:
+ from urllib.request import DataHandler as compat_urllib_request_DataHandler
+except ImportError: # Python < 3.4
+ # Ported from CPython 98774:1733b3bd46db, Lib/urllib/request.py
+ class compat_urllib_request_DataHandler(compat_urllib_request.BaseHandler):
+ def data_open(self, req):
+ # data URLs as specified in RFC 2397.
+ #
+ # ignores POSTed data
+ #
+ # syntax:
+ # dataurl := "data:" [ mediatype ] [ ";base64" ] "," data
+ # mediatype := [ type "/" subtype ] *( ";" parameter )
+ # data := *urlchar
+ # parameter := attribute "=" value
+ url = req.get_full_url()
+
+ scheme, data = url.split(":", 1)
+ mediatype, data = data.split(",", 1)
+
+ # even base64 encoded data URLs might be quoted so unquote in any case:
+ data = compat_urllib_parse_unquote_to_bytes(data)
+ if mediatype.endswith(";base64"):
+ data = binascii.a2b_base64(data)
+ mediatype = mediatype[:-7]
+
+ if not mediatype:
+ mediatype = "text/plain;charset=US-ASCII"
+
+ headers = email.message_from_string(
+ "Content-type: %s\nContent-length: %d\n" % (mediatype, len(data)))
+
+ return compat_urllib_response.addinfourl(io.BytesIO(data), headers, url)
+
+try:
+ compat_basestring = basestring # Python 2
+except NameError:
+ compat_basestring = str
+
+try:
+ compat_chr = unichr # Python 2
+except NameError:
+ compat_chr = chr
+
+try:
+ from xml.etree.ElementTree import ParseError as compat_xml_parse_error
+except ImportError: # Python 2.6
+ from xml.parsers.expat import ExpatError as compat_xml_parse_error
+
+if sys.version_info[0] >= 3:
+ compat_etree_fromstring = xml.etree.ElementTree.fromstring
+else:
+ # python 2.x tries to encode unicode strings with ascii (see the
+ # XMLParser._fixtext method)
+ etree = xml.etree.ElementTree
+
+ try:
+ _etree_iter = etree.Element.iter
+ except AttributeError: # Python <=2.6
+ def _etree_iter(root):
+ for el in root.findall('*'):
+ yield el
+ for sub in _etree_iter(el):
+ yield sub
+
+ # on 2.6 XML doesn't have a parser argument, function copied from CPython
+ # 2.7 source
+ def _XML(text, parser=None):
+ if not parser:
+ parser = etree.XMLParser(target=etree.TreeBuilder())
+ parser.feed(text)
+ return parser.close()
+
+ def _element_factory(*args, **kwargs):
+ el = etree.Element(*args, **kwargs)
+ for k, v in el.items():
+ if isinstance(v, bytes):
+ el.set(k, v.decode('utf-8'))
+ return el
+
+ def compat_etree_fromstring(text):
+ doc = _XML(text, parser=etree.XMLParser(target=etree.TreeBuilder(element_factory=_element_factory)))
+ for el in _etree_iter(doc):
+ if el.text is not None and isinstance(el.text, bytes):
+ el.text = el.text.decode('utf-8')
+ return doc