accumulator: Make get_list an abstract method

Implementations need the `self` parameter and PyLint complains when the
number of arguments changes. Since it's never used without
reimplementation, `@abstractmethod` is appropriate.

1 files changed, 4 insertions, 2 deletions

diff --git a/ranger/ext/accumulator.py b/ranger/ext/accumulator.py
index a41db634..c34370d8 100644
--- a/ranger/ext/accumulator.py
+++ b/ranger/ext/accumulator.py
@@ -3,6 +3,8 @@
 
 from __future__ import (absolute_import, division, print_function)
 
+from abc import abstractmethod
+
 from ranger.ext.direction import Direction
 
 
@@ -90,8 +92,8 @@ class Accumulator(object):
     def sync_index(self, **kw):
         self.move_to_obj(self.pointed_obj, **kw)
 
-    @staticmethod
-    def get_list():
+    @abstractmethod
+    def get_list(self):
         """OVERRIDE THIS"""
         return []