- some PEP changes, some method descriptions updated

- added a placeholder text to 2Sided Tool

flatcamTools/ToolDblSided.py

@@ -315,6 +315,7 @@ class DblSidedTool(FlatCAMTool):
 
         # Center point value
         self.center_entry = FCEntry()
+        self.center_entry.setPlaceholderText(_("Center point coordinates"))
 
         self.center_btn = FCButton('%s:' % _("Centroid"))
         self.center_btn.setToolTip(
@@ -503,7 +504,6 @@ class DblSidedTool(FlatCAMTool):
             lambda: self.point_entry.set_value(self.center_entry.get_value())
         )
 
-
         self.create_alignment_hole_button.clicked.connect(self.on_create_alignment_holes)
         self.calculate_bb_button.clicked.connect(self.on_bbox_coordinates)