--- a/dialogs/FBDVariableDialog.py	Tue Aug 15 22:38:43 2017 +0300
+++ b/dialogs/FBDVariableDialog.py	Wed Aug 16 11:47:27 2017 +0300
@@ -92,7 +92,7 @@
         # Create label for variable expression
         name_label = wx.StaticText(self, label=_('Expression:'))
         self.RightGridSizer.AddWindow(name_label, border=5,
-              flag=wx.GROW|wx.BOTTOM)
+              flag=wx.GROW | wx.BOTTOM)
 
         # Create text control for defining variable expression
         self.Expression = wx.TextCtrl(self)
@@ -102,19 +102,19 @@
         # Create a list box to selected variable expression in the list of
         # variables defined in POU
         self.VariableName = wx.ListBox(self, size=wx.Size(-1, 120),
-              style=wx.LB_SINGLE|wx.LB_SORT)
+              style=wx.LB_SINGLE | wx.LB_SORT)
         self.Bind(wx.EVT_LISTBOX, self.OnNameChanged, self.VariableName)
-        self.RightGridSizer.AddWindow(self.VariableName, border=4, flag=wx.GROW|wx.TOP)
+        self.RightGridSizer.AddWindow(self.VariableName, border=4, flag=wx.GROW | wx.TOP)
 
         # Add preview panel and associated label to sizers
         self.MainSizer.AddWindow(self.PreviewLabel, border=20,
-              flag=wx.GROW|wx.LEFT|wx.RIGHT)
+              flag=wx.GROW | wx.LEFT | wx.RIGHT)
         self.MainSizer.AddWindow(self.Preview, border=20,
-              flag=wx.GROW|wx.LEFT|wx.RIGHT)
+              flag=wx.GROW | wx.LEFT | wx.RIGHT)
 
         # Add buttons sizer to sizers
         self.MainSizer.AddSizer(self.ButtonSizer, border=20,
-              flag=wx.ALIGN_RIGHT|wx.BOTTOM|wx.LEFT|wx.RIGHT)
+              flag=wx.ALIGN_RIGHT | wx.BOTTOM | wx.LEFT | wx.RIGHT)
 
         # Set options that can be selected in class combo box
         for var_class, choice in VARIABLE_CLASSES_DICT.iteritems():