diff --git a/Lib/ldapurl.py b/Lib/ldapurl.py
index dc81dd9..1fa9b1c 100644
--- a/Lib/ldapurl.py
+++ b/Lib/ldapurl.py
@@ -398,10 +398,10 @@ def __repr__(self):
     )
 
   def __getattr__(self,name):
-    if self.attr2extype.has_key(name):
+    if name in self.attr2extype:
       extype = self.attr2extype[name]
       if self.extensions and \
-         self.extensions.has_key(extype) and \
+         extype in self.extensions and \
          not self.extensions[extype].exvalue is None:
         result = unquote(self.extensions[extype].exvalue)
       else:
@@ -413,7 +413,7 @@ def __getattr__(self,name):
     return result # __getattr__()
 
   def __setattr__(self,name,value):
-    if self.attr2extype.has_key(name):
+    if name in self.attr2extype:
       extype = self.attr2extype[name]
       if value is None:
         # A value of None means that extension is deleted
@@ -427,7 +427,7 @@ def __setattr__(self,name,value):
       self.__dict__[name] = value
 
   def __delattr__(self,name):
-    if self.attr2extype.has_key(name):
+    if name in self.attr2extype:
       extype = self.attr2extype[name]
       if self.extensions:
         try: