minor pylint updates

Author: tedchamb

vsts/vsts/_file_cache.py

@@ -33,20 +33,20 @@ def load(self):
         try:
             if os.path.isfile(self.file_name):
                 if self.max_age > 0 and os.stat(self.file_name).st_mtime + self.max_age < time.clock():
-                    logging.info('Cache file expired: {file}'.format(file=self.file_name))
+                    logging.info('Cache file expired: %s', file=self.file_name)
                     os.remove(self.file_name)
                 else:
-                    logging.info('Loading cache file: {file}'.format(file=self.file_name))
+                    logging.info('Loading cache file: %s', self.file_name)
                     self.data = get_file_json(self.file_name, throw_on_empty=False) or {}
             else:
-                logging.info('Cache file does not exist: {file}'.format(file=self.file_name))
-        except Exception as e:
-            logging.exception(e)
+                logging.info('Cache file does not exist: %s', self.file_name)
+        except Exception as ex:
+            logging.exception(ex)
             # file is missing or corrupt so attempt to delete it
             try:
                 os.remove(self.file_name)
-            except Exception as e2:
-                logging.exception(e2)
+            except Exception as ex2:
+                logging.exception(ex2)
         self.initial_load_occurred = True
 
     def save(self):

vsts/vsts/vss_connection.py

@@ -59,7 +59,7 @@ def _get_url_for_client_instance(self, client_class):
             if resource_areas is None:
                 raise VstsClientRequestError(('Failed to retrieve resource areas '
                                               + 'from server: {url}').format(url=self.base_url))
-            if len(resource_areas) == 0:
+            if not resource_areas:
                 # For OnPrem environments we get an empty list.
                 return self.base_url
             for resource_area in resource_areas: