remove typing_extensions requirement

[nominatim.git] / nominatim / typing.py

diff --git a/nominatim/typing.py b/nominatim/typing.py
index 6d7549899bda1ae674c4ee42a0a717ea10eb0445..308f3e6a2cbb515245e81aa47a739ce562b1c04e 100644 (file)
--- a/nominatim/typing.py
+++ b/nominatim/typing.py
@@ -9,14 +9,16 @@ Type definitions for typing annotations.
 
 Complex type definitions are moved here, to keep the source files readable.
 """
-from typing import Union, Mapping, TypeVar, TYPE_CHECKING
+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
+# pylint: disable=invalid-name,abstract-method,multiple-statements
+# pylint: disable=missing-class-docstring,useless-import-alias
 
 if TYPE_CHECKING:
     import psycopg2.sql
     import psycopg2.extensions
+    import psycopg2.extras
     import os
 
 StrPath = Union[str, 'os.PathLike[str]']
@@ -26,4 +28,25 @@ SysEnv = Mapping[str, str]
 # psycopg2-related types
 
 Query = Union[str, bytes, 'psycopg2.sql.Composable']
+
+T_ResultKey = TypeVar('T_ResultKey', int, str)
+
+class DictCursorResult(Mapping[str, Any]):
+    def __getitem__(self, x: Union[int, 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