Coding style

- Use staticmethod where possible.

eris/eris/__main__.py

@@ -679,7 +679,8 @@ class Screen:
                 worker_.result.reset()
             worker_.kill()
 
-    def _partition(self, percentage, widgets, length):
+    @staticmethod
+    def _partition(percentage, widgets, length):
         smaller_length = max(int(length * (percentage / 100)), 10)
         return [smaller_length, length - smaller_length]
 

fill3/fill3/__init__.py

@@ -122,7 +122,8 @@ class Column:
         return join_vertical([row_widget.appearance_for((width, item_height))
                               for row_widget, item_height in zip(self.widgets, heights)])
 
-    def _appearance_list(self, widgets):
+    @staticmethod
+    def _appearance_list(widgets):
         if widgets == []:
             return []
         appearances = [row_widget.appearance() for row_widget in widgets]

termstr/termstr.py

@@ -127,7 +127,8 @@ class CharStyle:
             attributes.append("u")
         return f"<CharStyle: fg:{self.fg_color} bg:{self.bg_color} attr:{','.join(attributes)}>"
 
-    def _color_code(self, color_, is_foreground):
+    @staticmethod
+    def _color_code(color_, is_foreground):
         if isinstance(color_, int):
             return color(color_, is_foreground)
         else:  # true color