bpo-40257: Improve help for the typing module

Lib/pydoc.py

@@ -1445,7 +1445,7 @@ def docother(self, object, name=None, mod=None, parent=None, maxlen=None, doc=No
         if not doc:
             doc = getdoc(object)
         if doc:
-            line += '\n' + self.indent(str(doc))
+            line += '\n' + self.indent(str(doc)) + '\n'
         return line
 
 class _PlainTextDoc(TextDoc):
@@ -1672,8 +1672,11 @@ def render_doc(thing, title='Python Library Documentation: %s', forceload=0,
               inspect.getdoc(object)):
         # If the passed object is a piece of data or an instance,
         # document its available methods instead of its value.
-        object = type(object)
-        desc += ' object'
+        if hasattr(object, '__origin__'):
+            object = object.__origin__
+        else:
+            object = type(object)
+            desc += ' object'
     return title % desc + '\n\n' + renderer.document(object, name)
 
 def doc(thing, title='Python Library Documentation: %s', forceload=0,

Lib/test/test_pydoc.py

@@ -1255,7 +1255,8 @@ class X:
         X.attr.__doc__ = 'Custom descriptor'
         self.assertEqual(self._get_summary_lines(X.attr), """\
 <test.test_pydoc.TestDescriptions.test_custom_non_data_descriptor.<locals>.Descr object>
-    Custom descriptor""")
+    Custom descriptor
+""")
 
         X.attr.__name__ = 'foo'
         self.assertEqual(self._get_summary_lines(X.attr), """\

Lib/typing.py

@@ -323,6 +323,10 @@ def __init__(self, name, doc):
         self._name = name
         self._doc = doc
 
+    @property
+    def __doc__(self):
+        return self._doc
+
     def __eq__(self, other):
         if not isinstance(other, _SpecialForm):
             return NotImplemented
@@ -672,6 +676,8 @@ def __init__(self, origin, params, *, inst=True, special=False, name=None):
         self.__slots__ = None  # This is not documented.
         if not name:
             self.__module__ = origin.__module__
+        if special:
+            self.__doc__ = f'A generic version of {origin.__module__}.{origin.__qualname__}'
 
     @_tp_cache
     def __getitem__(self, params):