Shim TypedDict and NotRequired at runtime until

the lowest supported Python version catches up.

IPython/core/completer.py

@@ -167,7 +167,6 b' from typing import ('
     TYPE_CHECKING,
     Set,
 )
-from typing_extensions import TypedDict, NotRequired
 
 from IPython.core.error import TryNext
 from IPython.core.inputtransformer2 import ESC_MAGIC
@@ -208,11 +207,14 b' except ImportError:'
 
 if TYPE_CHECKING:
     from typing import cast
+    from typing_extensions import TypedDict, NotRequired
 else:
 
     def cast(obj, _type):
         return obj
 
+    TypedDict = Dict
+    NotRequired = Tuple
 
 # -----------------------------------------------------------------------------
 # Globals

setup.cfg

@@ -74,6 +74,7 b' test_extra ='
     numpy>=1.19
     pandas
     trio
+    typing_extensions
 all =
     %(black)s
     %(doc)s