More 2to3 fixes in the Tools directory. Fixes #2893.
diff --git a/Tools/modulator/varsubst.py b/Tools/modulator/varsubst.py
index 473fb55..4b68512 100644
--- a/Tools/modulator/varsubst.py
+++ b/Tools/modulator/varsubst.py
@@ -28,7 +28,7 @@
                 s = s[2:]
                 continue
             name = m.group(1)
-            if not self.dict.has_key(name):
+            if name not in self.dict:
                 raise error('No such variable: '+name)
             value = self.dict[name]
             if self.do_useindent and '\n' in value: