Make TypedDict instance callable

Author: cdce8p

ChangeLog

@@ -25,6 +25,10 @@ Release date: TBA
 
   Closes PyCQA/pylint#4685
 
+* Fix issue that ``TypedDict`` instance wasn't callable.
+
+  Closes PyCQA/pylint#4715
+
 
 What's New in astroid 2.6.2?
 ============================

astroid/brain/brain_typing.py

@@ -14,7 +14,7 @@
 from functools import partial
 
 from astroid import context, extract_node, inference_tip, node_classes
-from astroid.const import PY37_PLUS, PY39_PLUS
+from astroid.const import PY37_PLUS, PY38_PLUS, PY39_PLUS
 from astroid.exceptions import (
     AttributeInferenceError,
     InferenceError,
@@ -185,10 +185,18 @@ def infer_typing_attr(
 
 
 def _looks_like_typedDict(  # pylint: disable=invalid-name
-    node: FunctionDef,
+    node: typing.Union[FunctionDef, ClassDef],
 ) -> bool:
     """Check if node is TypedDict FunctionDef."""
-    return isinstance(node, FunctionDef) and node.name == "TypedDict"
+    return node.qname() in ("typing.TypedDict", "typing_extensions.TypedDict")
+
+
+def infer_old_typedDict(  # pylint: disable=invalid-name
+    node: ClassDef, ctx: context.InferenceContext = None
+) -> typing.Iterator[ClassDef]:
+    func_to_add = extract_node("dict")
+    node.locals["__call__"] = [func_to_add]
+    return iter([node])
 
 
 def infer_typedDict(  # pylint: disable=invalid-name
@@ -202,6 +210,8 @@ def infer_typedDict(  # pylint: disable=invalid-name
         parent=node.parent,
     )
     class_def.postinit(bases=[extract_node("dict")], body=[], decorators=None)
+    func_to_add = extract_node("dict")
+    class_def.locals["__call__"] = [func_to_add]
     return iter([class_def])
 
 
@@ -364,6 +374,10 @@ def infer_tuple_alias(
     AstroidManager().register_transform(
         FunctionDef, inference_tip(infer_typedDict), _looks_like_typedDict
     )
+elif PY38_PLUS:
+    AstroidManager().register_transform(
+        ClassDef, inference_tip(infer_old_typedDict), _looks_like_typedDict
+    )
 
 if PY37_PLUS:
     AstroidManager().register_transform(

tests/unittest_brain.py

@@ -1613,19 +1613,28 @@ def test_typing_namedtuple_dont_crash_on_no_fields(self):
 
     @test_utils.require_version("3.8")
     def test_typed_dict(self):
-        node = builder.extract_node(
+        code = builder.extract_node(
             """
         from typing import TypedDict
-        class CustomTD(TypedDict):
+        class CustomTD(TypedDict):  #@
             var: int
+        CustomTD(var=1)  #@
         """
         )
-        inferred_base = next(node.bases[0].infer())
+        inferred_base = next(code[0].bases[0].infer())
         assert isinstance(inferred_base, nodes.ClassDef)
         assert inferred_base.qname() == "typing.TypedDict"
         typedDict_base = next(inferred_base.bases[0].infer())
         assert typedDict_base.qname() == "builtins.dict"
 
+        # Test TypedDict has `__call__` method
+        local_call = inferred_base.locals.get("__call__", None)
+        assert local_call and len(local_call) == 1
+        assert isinstance(local_call[0], nodes.Name) and local_call[0].name == "dict"
+
+        # Test TypedDict instance is callable
+        assert next(code[1].infer()).callable() is True
+
     @test_utils.require_version(minver="3.7")
     def test_typing_alias_type(self):
         """