Python version independent string and unicode handling.

src/Mod/Path/PathScripts/PathUtil.py

@@ -33,6 +33,7 @@ other than PathLog, then it probably doesn't belong here.
 '''
 
 import PathScripts.PathLog as PathLog
+import sys
 
 PathLog.setLevel(PathLog.Level.INFO, PathLog.thisModule())
 
@@ -96,3 +97,18 @@ Use this function to remove all expressions before deletion.'''
     if hasattr(obj, 'ExpressionEngine'):
         for attr,expr in obj.ExpressionEngine:
             obj.setExpression(attr, None)
+
+def toUnicode(string):
+    '''toUnicode(string) ... returns a unicode version of string regardless of the python version.'''
+    if sys.version_info[0] < 3:
+        return unicode(string)
+    return string
+
+def isString(string):
+    '''isString(string) ... return True if string is a string, regardless of string type and python version.'''
+    if type(string) == str:
+        return True
+    if sys.version_info[0] < 3 and type(string) == unicode:
+        return True
+    return False
+