diff --git a/python/src/cloudstorage/api_utils.py b/python/src/cloudstorage/api_utils.py
index 4d1716f..33e4b6e 100644
--- a/python/src/cloudstorage/api_utils.py
+++ b/python/src/cloudstorage/api_utils.py
@@ -170,7 +170,7 @@ def run(self, tasklet, **kwds):
             'Tasklet has exceeded request deadline after %s seconds total',
             time.time() - start_time)
         raise
-      except self.retriable_exceptions, e:
+      except self.retriable_exceptions as e:
         pass
 
       if n == 1:
diff --git a/python/src/cloudstorage/storage_api.py b/python/src/cloudstorage/storage_api.py
index 2f3c597..7e02f17 100644
--- a/python/src/cloudstorage/storage_api.py
+++ b/python/src/cloudstorage/storage_api.py
@@ -126,7 +126,7 @@ def do_request_async(self, url, method='GET', headers=None, payload=None,
       resp_tuple = yield super(_StorageApi, self).do_request_async(
           url, method=method, headers=headers, payload=payload,
           deadline=deadline, callback=callback)
-    except urlfetch.DownloadError, e:
+    except urlfetch.DownloadError as e:
       raise errors.TimeoutError(
           'Request to Google Cloud Storage timed out.', e)