diff --git a/Lib/ConfigParser.py b/Lib/ConfigParser.py
index 9a365c0..8e644e1 100644
--- a/Lib/ConfigParser.py
+++ b/Lib/ConfigParser.py
@@ -569,7 +569,7 @@
                     value = value % vars
                 except KeyError as e:
                     raise InterpolationMissingOptionError(
-                        option, section, rawval, e.message)
+                        option, section, rawval, e.args[0])
             else:
                 break
         if "%(" in value:
diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index a57ab43..c4bd610 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -156,7 +156,7 @@
         try:
             f = open(TESTFN, bad_mode)
         except ValueError as msg:
-            if msg.message != 0:
+            if msg.args[0] != 0:
                 s = str(msg)
                 if s.find(TESTFN) != -1 or s.find(bad_mode) == -1:
                     self.fail("bad error message for invalid mode: %s" % s)