Merge pull request #923 from lukpueh/fix-pylint-warnings

Fix failing builds due to pylint 2.4.0 update

tuf/client/updater.py

@@ -1728,7 +1728,6 @@ def _update_metadata(self, metadata_role, upperbound_filelength, version=None):
     # Construct the metadata filename as expected by the download/mirror
     # modules.
     metadata_filename = metadata_role + '.json'
-    metadata_filename = metadata_filename
 
     # Attempt a file download from each mirror until the file is downloaded and
     # verified.  If the signature of the downloaded file is valid, proceed,

tuf/log.py

@@ -173,7 +173,7 @@ def filter(self, record):
       # file logging handler, the user may always consult the file log for the
       # original exception traceback. The exc_info is explained here:
       # http://docs.python.org/2/library/sys.html#sys.exc_info
-      exc_type, junk, junk = record.exc_info
+      exc_type, _, _ = record.exc_info
 
       # Simply set the class name as the exception text.
       record.exc_text = exc_type.__name__