[client rework]: Fix various pylint issues

Fix linter issues after applying the api/pylintrc config.

Signed-off-by: Teodora Sechkova <tsechkova@vmware.com>

tuf/client_rework/metadata_wrapper.py

@@ -25,18 +25,19 @@ def __init__(self, meta):
  def from_json_object(cls, tmp_file):
  """Loads JSON-formatted TUF metadata from a file object."""
  raw_data = tmp_file.read()
-
+ # Use local scope import to avoid circular import errors
+ # pylint: disable=import-outside-toplevel
  from tuf.api.serialization.json import JSONDeserializer
 
  deserializer = JSONDeserializer()
- _meta = deserializer.deserialize(raw_data)
- return cls(meta=_meta)
+ meta = deserializer.deserialize(raw_data)
+ return cls(meta=meta)
 
  @classmethod
  def from_json_file(cls, filename):
  """Loads JSON-formatted TUF metadata from a file."""
- _meta = metadata.Metadata.from_file(filename)
- return cls(meta=_meta)
+ meta = metadata.Metadata.from_file(filename)
+ return cls(meta=meta)
 
  @property
  def signed(self):
@@ -97,7 +98,7 @@ def keys(self, role):
  keys = []
  for keyid in self._meta.signed.roles[role]["keyids"]:
  key_metadata = self._meta.signed.keys[keyid]
- key, _ = format_metadata_to_key(key_metadata)
+ key, dummy = format_metadata_to_key(key_metadata)
  keys.append(key)
 
  return keys
@@ -162,7 +163,7 @@ def keys(self, role):
  if delegation["name"] == role:
  for keyid in delegation["keyids"]:
  key_metadata = self._meta.signed.delegations["keys"][keyid]
- key, _ = format_metadata_to_key(key_metadata)
+ key, dummy = format_metadata_to_key(key_metadata)
  keys.append(key)
  return keys