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-rw-r--r--synapse/rest/client/transactions.py2
-rw-r--r--synapse/rest/client/v1/admin.py12
-rw-r--r--synapse/rest/media/v1/media_repository.py3
-rw-r--r--synapse/rest/media/v1/preview_url_resource.py8
4 files changed, 13 insertions, 12 deletions
diff --git a/synapse/rest/client/transactions.py b/synapse/rest/client/transactions.py
index 20fa6678ef..7c01b438cb 100644
--- a/synapse/rest/client/transactions.py
+++ b/synapse/rest/client/transactions.py
@@ -104,7 +104,7 @@ class HttpTransactionCache(object):
 
     def _cleanup(self):
         now = self.clock.time_msec()
-        for key in self.transactions.keys():
+        for key in list(self.transactions):
             ts = self.transactions[key][1]
             if now > (ts + CLEANUP_PERIOD_MS):  # after cleanup period
                 del self.transactions[key]
diff --git a/synapse/rest/client/v1/admin.py b/synapse/rest/client/v1/admin.py
index 6835a7bba2..b8665a45eb 100644
--- a/synapse/rest/client/v1/admin.py
+++ b/synapse/rest/client/v1/admin.py
@@ -169,16 +169,12 @@ class PurgeHistoryRestServlet(ClientV1RestServlet):
                 yield self.store.find_first_stream_ordering_after_ts(ts)
             )
 
-            room_event_after_stream_ordering = (
+            r = (
                 yield self.store.get_room_event_after_stream_ordering(
                     room_id, stream_ordering,
                 )
             )
-            if room_event_after_stream_ordering:
-                token = yield self.store.get_topological_token_for_event(
-                    room_event_after_stream_ordering,
-                )
-            else:
+            if not r:
                 logger.warn(
                     "[purge] purging events not possible: No event found "
                     "(received_ts %i => stream_ordering %i)",
@@ -189,8 +185,10 @@ class PurgeHistoryRestServlet(ClientV1RestServlet):
                     "there is no event to be purged",
                     errcode=Codes.NOT_FOUND,
                 )
+            (stream, topo, _event_id) = r
+            token = "t%d-%d" % (topo, stream)
             logger.info(
-                "[purge] purging up to token %d (received_ts %i => "
+                "[purge] purging up to token %s (received_ts %i => "
                 "stream_ordering %i)",
                 token, ts, stream_ordering,
             )
diff --git a/synapse/rest/media/v1/media_repository.py b/synapse/rest/media/v1/media_repository.py
index 9800ce7581..2ac767d2dc 100644
--- a/synapse/rest/media/v1/media_repository.py
+++ b/synapse/rest/media/v1/media_repository.py
@@ -48,6 +48,7 @@ import shutil
 import cgi
 import logging
 from six.moves.urllib import parse as urlparse
+from six import iteritems
 
 logger = logging.getLogger(__name__)
 
@@ -603,7 +604,7 @@ class MediaRepository(object):
                 thumbnails[(t_width, t_height, r_type)] = r_method
 
         # Now we generate the thumbnails for each dimension, store it
-        for (t_width, t_height, t_type), t_method in thumbnails.iteritems():
+        for (t_width, t_height, t_type), t_method in iteritems(thumbnails):
             # Generate the thumbnail
             if t_method == "crop":
                 t_byte_source = yield make_deferred_yieldable(threads.deferToThread(
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 2839207abc..565cef2b8d 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -24,7 +24,9 @@ import shutil
 import sys
 import traceback
 import simplejson as json
-import urlparse
+
+from six.moves import urllib_parse as urlparse
+from six import string_types
 
 from twisted.web.server import NOT_DONE_YET
 from twisted.internet import defer
@@ -590,8 +592,8 @@ def _iterate_over_text(tree, *tags_to_ignore):
     # to be returned.
     elements = iter([tree])
     while True:
-        el = elements.next()
-        if isinstance(el, basestring):
+        el = next(elements)
+        if isinstance(el, string_types):
             yield el
         elif el is not None and el.tag not in tags_to_ignore:
             # el.text is the text before the first child, so we can immediately