diff -r 362039519454 -r 7dd551ac2fa0 dialogs/IDMergeDialog.py
--- a/dialogs/IDMergeDialog.py	Thu Mar 07 21:57:18 2019 +0100
+++ b/dialogs/IDMergeDialog.py	Mon Mar 11 01:03:32 2019 +0100
@@ -6,7 +6,8 @@
 from __future__ import absolute_import
 import wx
 
-# class RichMessageDialog is still not available in wxPython 3.0.2 
+
+# class RichMessageDialog is still not available in wxPython 3.0.2
 class IDMergeDialog(wx.Dialog):
     def __init__(self, parent, title, question, optiontext, button_texts):
         wx.Dialog.__init__(self, parent, title=title)
@@ -15,17 +16,19 @@
 
         message = wx.StaticText(self, label=question)
         main_sizer.AddWindow(message, border=20,
-                             flag = wx.ALIGN_CENTER_HORIZONTAL | wx.TOP | wx.LEFT | wx.RIGHT)
+                             flag=wx.ALIGN_CENTER_HORIZONTAL | wx.TOP | wx.LEFT | wx.RIGHT)
 
         self.check = wx.CheckBox(self, label=optiontext)
         main_sizer.AddWindow(self.check, border=20,
                              flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_CENTER_HORIZONTAL)
 
         buttons_sizer = wx.BoxSizer(wx.HORIZONTAL)
-        for label,wxID in zip(button_texts, [wx.ID_YES, wx.ID_NO, wx.ID_CANCEL]):
+        for label, wxID in zip(button_texts, [wx.ID_YES, wx.ID_NO, wx.ID_CANCEL]):
             Button = wx.Button(self, label=label)
+
             def OnButtonFactory(_wxID):
                 return lambda event: self.EndModal(_wxID)
+
             self.Bind(wx.EVT_BUTTON, OnButtonFactory(wxID), Button)
             buttons_sizer.AddWindow(Button)