# HG changeset patch
# Parent  3c0a817ab6169124c29626d5fd9686df75015bc0
Issue #25590: Make rlcompleter only call getattr() once per attribute

Previously it was called another time via hasattr(), and both calls were
repeated for dir(f) and dir(f.__class__).  This includes a backport of
changing from a list to a set from revision 4dbb315fe667.

diff -r 3c0a817ab616 Lib/rlcompleter.py
--- a/Lib/rlcompleter.py	Tue Nov 10 19:50:14 2015 +0200
+++ b/Lib/rlcompleter.py	Wed Nov 11 01:23:51 2015 +0000
@@ -136,20 +136,23 @@
             return []
 
         # get the content of the object, except __builtins__
-        words = dir(thisobject)
-        if "__builtins__" in words:
-            words.remove("__builtins__")
+        words = set(dir(thisobject))
+        words.discard("__builtins__")
 
         if hasattr(thisobject, '__class__'):
-            words.append('__class__')
-            words.extend(get_class_members(thisobject.__class__))
+            words.add('__class__')
+            words.update(get_class_members(thisobject.__class__))
         matches = []
         n = len(attr)
         for word in words:
-            if word[:n] == attr and hasattr(thisobject, word):
-                val = getattr(thisobject, word)
+            if word[:n] == attr:
+                try:
+                    val = getattr(thisobject, word)
+                except Exception:
+                    continue  # Exclude properties that are not set
                 word = self._callable_postfix(val, "%s.%s" % (expr, word))
                 matches.append(word)
+        matches.sort()
         return matches
 
 def get_class_members(klass):
diff -r 3c0a817ab616 Lib/test/test_rlcompleter.py
--- a/Lib/test/test_rlcompleter.py	Tue Nov 10 19:50:14 2015 +0200
+++ b/Lib/test/test_rlcompleter.py	Wed Nov 11 01:23:51 2015 +0000
@@ -64,6 +64,19 @@
                          ['egg.{}('.format(x) for x in dir(str)
                           if x.startswith('s')])
 
+    def test_excessive_getattr(self):
+        # Ensure getattr() is invoked no more than once per attribute
+        class Foo:
+            calls = 0
+            @property
+            def bar(self):
+                self.calls += 1
+                return None
+        f = Foo()
+        completer = rlcompleter.Completer(dict(f=f))
+        self.assertEqual(completer.complete('f.b', 0), 'f.bar')
+        self.assertEqual(f.calls, 1)
+
     def test_complete(self):
         completer = rlcompleter.Completer()
         self.assertEqual(completer.complete('', 0), '\t')
diff -r 3c0a817ab616 Misc/NEWS
--- a/Misc/NEWS	Tue Nov 10 19:50:14 2015 +0200
+++ b/Misc/NEWS	Wed Nov 11 01:23:51 2015 +0000
@@ -100,6 +100,9 @@
 Library
 -------
 
+- Issue #25590: In the Readline completer, only call getattr() once per
+  attribute.
+
 - Issue #18010: Fix the pydoc web server's module search function to handle
   exceptions from importing packages.