diff --git a/src/importer/importer.py b/src/importer/importer.py
index ca95a91..2a1e7b7 100644
--- a/src/importer/importer.py
+++ b/src/importer/importer.py
@@ -8,6 +8,7 @@ from src.utils.steamgriddb import SGDBAuthError, SGDBError, SGDBHelper
 from src.utils.task import Task
 
 
+# pylint: disable=too-many-instance-attributes
 class Importer:
     """A class in charge of scanning sources for games"""
 
@@ -87,9 +88,6 @@ class Importer:
         self.import_dialog.present()
 
     def update_progressbar(self):
-        logging.debug(
-            "Progressbar updated (%f)", self.progress
-        )  # TODO why progress not workie?
         self.progressbar.set_fraction(self.progress)
 
     def source_task_thread_func(self, _task, _obj, data, _cancellable):
@@ -162,7 +160,7 @@ class Importer:
         except SGDBAuthError as error:
             cancellable.cancel()
             self.sgdb_error = error
-        except (HTTPError, SGDBError) as error:
+        except (HTTPError, SGDBError) as _error:
             # TODO handle other SGDB errors
             pass
 
diff --git a/src/importer/source.py b/src/importer/source.py
index 7a959ed..a2fca0c 100644
--- a/src/importer/source.py
+++ b/src/importer/source.py
@@ -28,7 +28,7 @@ class SourceIterator(Iterator, Sized):
 class Source(Iterable):
     """Source of games. E.g an installed app with a config file that lists game directories"""
 
-    win = None  # TODO maybe not depend on that ?
+    win = None
 
     name: str
     variant: str
diff --git a/src/importer/sources/lutris_source.py b/src/importer/sources/lutris_source.py
index 25fe8aa..23c65b8 100644
--- a/src/importer/sources/lutris_source.py
+++ b/src/importer/sources/lutris_source.py
@@ -1,4 +1,4 @@
-from functools import cache
+from functools import lru_cache
 from sqlite3 import connect
 from time import time
 
@@ -48,7 +48,7 @@ class LutrisSourceIterator(SourceIterator):
             self.db_games_request, self.db_request_params
         )
 
-    @cache
+    @lru_cache(maxsize=1)
     def __len__(self):
         cursor = self.db_connection.execute(self.db_len_request, self.db_request_params)
         return cursor.fetchone()[0]
@@ -60,9 +60,9 @@ class LutrisSourceIterator(SourceIterator):
         row = None
         try:
             row = self.db_cursor.__next__()
-        except StopIteration as e:
+        except StopIteration as error:
             self.db_connection.close()
-            raise e
+            raise error
 
         # Create game
         values = {
@@ -99,16 +99,13 @@ class LutrisSource(Source):
 
     @property
     def is_installed(self):
+        # pylint: disable=pointless-statement
         try:
             self.location
             self.cache_location
         except FileNotFoundError:
             return False
-        else:
-            return True
-
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
+        return True
 
     def __iter__(self):
         return LutrisSourceIterator(source=self)
diff --git a/src/utils/task.py b/src/utils/task.py
index a698e8b..c6b7076 100644
--- a/src/utils/task.py
+++ b/src/utils/task.py
@@ -1,6 +1,7 @@
-from gi.repository import Gio
 from functools import wraps
 
+from gi.repository import Gio
+
 
 def create_task_thread_func_closure(func, data):
     """Wrap a Gio.TaskThreadFunc with the given data in a closure"""
@@ -17,8 +18,7 @@ def decorate_set_task_data(task):
     def decorator(original_method):
         @wraps(original_method)
         def new_method(task_data):
-            task.__task_data = task_data
-            pass
+            task.task_data = task_data
 
         return new_method
 
@@ -32,9 +32,7 @@ def decorate_run_in_thread(task):
     def decorator(original_method):
         @wraps(original_method)
         def new_method(task_thread_func):
-            closure = create_task_thread_func_closure(
-                task_thread_func, task.__task_data
-            )
+            closure = create_task_thread_func_closure(task_thread_func, task.task_data)
             original_method(closure)
 
         return new_method
@@ -42,6 +40,7 @@ def decorate_run_in_thread(task):
     return decorator
 
 
+# pylint: disable=too-few-public-methods
 class Task:
     """Wrapper around Gio.Task to patch task data not being passed"""