replace has_key with 'in' operator
diff --git a/Lib/idlelib/PathBrowser.py b/Lib/idlelib/PathBrowser.py
index 86cd270..8c73587 100644
--- a/Lib/idlelib/PathBrowser.py
+++ b/Lib/idlelib/PathBrowser.py
@@ -78,7 +78,7 @@
                 normed_name = os.path.normcase(name)
                 if normed_name[i:] == suff:
                     mod_name = name[:i]
-                    if not modules.has_key(mod_name):
+                    if mod_name not in modules:
                         modules[mod_name] = None
                         sorted.append((normed_name, name))
                         allnames.remove(name)