Use six to make utils/services Python 3 compatible (#69)

* Use ensure_binary to make xml data Python 3 compatible
* Add ensure_text to string concat in _parse_envelopes
* Add ensure_text for stdout
* Sort event_types for consistency

exchangelib/services.py

@@ -21,7 +21,7 @@
 from sys import stdout
 import traceback
 
-from six import text_type
+from six import ensure_text, text_type
 
 from . import errors
 from .errors import EWSWarning, TransportError, SOAPError, ErrorTimeoutExpired, ErrorBatchProcessingStopped, \
@@ -270,7 +270,7 @@ def _write_xml(self, ftype, req_id, xml_str):
         elif ftype == 'streaming-response':
             stdout.write(u'STREAMING RESPONSE {} <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< {}\n'.format(req_id, now))
 
-        stdout.write(PrettyXmlHandler.prettify_xml(xml_str) + b'\n')
+        stdout.write(ensure_text(PrettyXmlHandler.prettify_xml(xml_str) + b'\n'))
 
     def _parse_envelopes(self, response):
         try:
@@ -279,6 +279,7 @@ def _parse_envelopes(self, response):
             for chunk in response.iter_content():
                 if not chunk:
                     continue
+                chunk = ensure_text(chunk)
                 curr_envelope += chunk
                 index = curr_envelope.find(envelope_str)
                 if index == -1:
@@ -1577,7 +1578,7 @@ def get_payload(self, folders, event_types):
             assert event_type in CONCRETE_EVENT_TYPES
             deduped_event_types.add(event_type.ELEMENT_NAME)
 
-        for event_type_name in deduped_event_types:
+        for event_type_name in sorted(deduped_event_types):
             if event_type_name == 'StatusEvent':
                 continue
             event_type_elem = create_element('t:EventType')

exchangelib/util.py

@@ -22,7 +22,7 @@
 import requests.auth
 import requests.exceptions
 from requests import Request
-from six import text_type, string_types
+from six import ensure_binary, string_types, text_type
 
 from .errors import TransportError, RateLimitError, RedirectError, RelativeRedirect, CASError, UnauthorizedError, \
     InvalidTokenError, ErrorInvalidSchemaVersionForMailboxVersion
@@ -296,8 +296,7 @@ def parse_bytes(xml_bytes):
     @classmethod
     def prettify_xml(cls, xml_bytes):
         # Re-formats an XML document to a consistent style
-        if isinstance(xml_bytes, unicode):
-            xml_bytes = xml_bytes.encode('utf-8')
+        xml_bytes = ensure_binary(xml_bytes)
         return tostring(
             cls.parse_bytes(xml_bytes),
             xml_declaration=True,
@@ -512,7 +511,7 @@ def post_ratelimited(protocol, session, url, headers, data, allow_redirects=Fals
             # Always create a dummy response for logging purposes, in case we fail in the following
             r = DummyResponse(url=url, headers={}, request_headers=headers)
             try:
-                data = data.encode('utf-8')
+                data = ensure_binary(data)
             except UnicodeDecodeError:
                 try:
                     data = data.decode('utf-8').encode('utf-8')