Speed-up search for hidden names by using a set instead of a tuple.

Lib/pydoc.py

@@ -168,11 +168,11 @@ def _split_list(s, predicate):
 def visiblename(name, all=None):
     """Decide whether to show documentation on a variable."""
     # Certain special names are redundant.
-    _hidden_names = ('__builtins__', '__doc__', '__file__', '__path__',
+    if name in {'__builtins__', '__doc__', '__file__', '__path__',
                      '__module__', '__name__', '__slots__', '__package__',
                      '__cached__', '__author__', '__credits__', '__date__',
-                     '__version__')
-    if name in _hidden_names: return 0
+                     '__version__'}:
+        return 0
     # Private names are hidden, but special names are displayed.
     if name.startswith('__') and name.endswith('__'): return 1
     if all is not None: