bpo-26120: make pydoc exclude __future__ imports from the data block of the module (GH-30888)

1 files changed, 7 insertions, 0 deletions

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 85eefa4..7ae3908 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -54,6 +54,7 @@ Richard Chamberlain, for the first implementation of textdoc.
 #     the current directory is changed with os.chdir(), an incorrect
 #     path will be displayed.
 
+import __future__
 import builtins
 import importlib._bootstrap
 import importlib._bootstrap_external
@@ -274,6 +275,8 @@ def _split_list(s, predicate):
             no.append(x)
     return yes, no
 
+_future_feature_names = set(__future__.all_feature_names)
+
 def visiblename(name, all=None, obj=None):
     """Decide whether to show documentation on a variable."""
     # Certain special names are redundant or internal.
@@ -288,6 +291,10 @@ def visiblename(name, all=None, obj=None):
     # Namedtuples have public fields and methods with a single leading underscore
     if name.startswith('_') and hasattr(obj, '_fields'):
         return True
+    # Ignore __future__ imports.
+    if name in _future_feature_names:
+        if isinstance(getattr(obj, name, None), __future__._Feature):
+            return False
     if all is not None:
         # only document that which the programmer exported in __all__
         return name in all