Fix some more has_key() uses.  This could really use a tool to automate...
diff --git a/Lib/xml/dom/domreg.py b/Lib/xml/dom/domreg.py
index 684c436..ec3acdf 100644
--- a/Lib/xml/dom/domreg.py
+++ b/Lib/xml/dom/domreg.py
@@ -57,7 +57,7 @@
         return mod.getDOMImplementation()
     elif name:
         return registered[name]()
-    elif os.environ.has_key("PYTHON_DOM"):
+    elif "PYTHON_DOM" in os.environ:
         return getDOMImplementation(name = os.environ["PYTHON_DOM"])
 
     # User did not specify a name, try implementations in arbitrary