X-Git-Url: https://git.openstreetmap.org/nominatim.git/blobdiff_plain/5617bffe2fcf527365bcd801304180e1cc07cb98..d4c6e58b57e58fedbb53a2f986c1f6eb76a95f41:/nominatim/typing.py

diff --git a/nominatim/typing.py b/nominatim/typing.py
index 36bde834..7914d731 100644
--- a/nominatim/typing.py
+++ b/nominatim/typing.py
@@ -11,8 +11,9 @@ Complex type definitions are moved here, to keep the source files readable.
 """
 from typing import Any, Union, Mapping, TypeVar, Sequence, TYPE_CHECKING
 
-# Generics varaible names do not confirm to naming styles, ignore globally here.
-# pylint: disable=invalid-name,abstract-method,multiple-statements,missing-class-docstring
+# Generics variable names do not confirm to naming styles, ignore globally here.
+# pylint: disable=invalid-name,abstract-method,multiple-statements
+# pylint: disable=missing-class-docstring,useless-import-alias
 
 if TYPE_CHECKING:
     import psycopg2.sql
@@ -36,3 +37,16 @@ class DictCursorResult(Mapping[str, Any]):
 DictCursorResults = Sequence[DictCursorResult]
 
 T_cursor = TypeVar('T_cursor', bound='psycopg2.extensions.cursor')
+
+# The following typing features require typing_extensions to work
+# on all supported Python versions.
+# Only require this for type checking but not for normal operations.
+
+if TYPE_CHECKING:
+    from typing_extensions import (Protocol as Protocol,
+                                   Final as Final,
+                                   TypedDict as TypedDict)
+else:
+    Protocol = object
+    Final = 'Final'
+    TypedDict = dict