diff -r 2a70d5240300 -r 21164625b393 dialogs/ForceVariableDialog.py
--- a/dialogs/ForceVariableDialog.py	Fri Nov 23 11:01:20 2018 +0100
+++ b/dialogs/ForceVariableDialog.py	Fri Nov 23 12:13:24 2018 +0100
@@ -25,6 +25,7 @@
 from __future__ import absolute_import
 import re
 import datetime
+from builtins import str as text
 
 import wx
 
@@ -69,10 +70,10 @@
 HOUR = 60 * MINUTE
 DAY = 24 * HOUR
 
-IEC_TIME_MODEL = re.compile("(?:(?:T|TIME)#)?(-)?(?:(%(float)s)D_?)?(?:(%(float)s)H_?)?(?:(%(float)s)M(?!S)_?)?(?:(%(float)s)S_?)?(?:(%(float)s)MS)?$" % {"float": "[0-9]+(?:\.[0-9]+)?"})
-IEC_DATE_MODEL = re.compile("(?:(?:D|DATE)#)?([0-9]{4})-([0-9]{2})-([0-9]{2})$")
-IEC_DATETIME_MODEL = re.compile("(?:(?:DT|DATE_AND_TIME)#)?([0-9]{4})-([0-9]{2})-([0-9]{2})-([0-9]{2}):([0-9]{2}):([0-9]{2}(?:\.[0-9]+)?)$")
-IEC_TIMEOFDAY_MODEL = re.compile("(?:(?:TOD|TIME_OF_DAY)#)?([0-9]{2}):([0-9]{2}):([0-9]{2}(?:\.[0-9]+)?)$")
+IEC_TIME_MODEL = re.compile(r"(?:(?:T|TIME)#)?(-)?(?:(%(float)s)D_?)?(?:(%(float)s)H_?)?(?:(%(float)s)M(?!S)_?)?(?:(%(float)s)S_?)?(?:(%(float)s)MS)?$" % {"float": r"[0-9]+(?:\.[0-9]+)?"})
+IEC_DATE_MODEL = re.compile(r"(?:(?:D|DATE)#)?([0-9]{4})-([0-9]{2})-([0-9]{2})$")
+IEC_DATETIME_MODEL = re.compile(r"(?:(?:DT|DATE_AND_TIME)#)?([0-9]{4})-([0-9]{2})-([0-9]{2})-([0-9]{2}):([0-9]{2}):([0-9]{2}(?:\.[0-9]+)?)$")
+IEC_TIMEOFDAY_MODEL = re.compile(r"(?:(?:TOD|TIME_OF_DAY)#)?([0-9]{2}):([0-9]{2}):([0-9]{2}(?:\.[0-9]+)?)$")
 
 
 def gettime(v):
@@ -200,7 +201,7 @@
 
     def ToggleBoolValue(self, event):
         value = self.ToggleButton.GetValue()
-        self.ValueTextCtrl.SetValue(unicode(value))
+        self.ValueTextCtrl.SetValue(text(value))
 
     def OnOK(self, event):
         message = None