Give up trying to keep dynamically loaded extensions up to date:
the import.c machinery has soundly defeated my every attempt.
diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index cc0f27b..4a21bc3 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -1017,7 +1017,13 @@
# isn't good enough (e.g. what if the module contains a class that
# inherits from another module that has changed?).
if path not in sys.builtin_module_names:
- del sys.modules[path]
+ # Python never loads a dynamic extension a second time from the
+ # same path, even if the file is changed or missing. Deleting
+ # the entry in sys.modules doesn't help for dynamic extensions,
+ # so we're not even going to try to keep them up to date.
+ info = inspect.getmoduleinfo(sys.modules[path].__file__)
+ if info[3] != imp.C_EXTENSION:
+ del sys.modules[path]
try:
module = __import__(path)
except: