From 12ba20764ef020308a4cd88fa7ccf040888b49a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rodrigo=20Gir=C3=A3o=20Serr=C3=A3o?=
 <5621605+rodrigogiraoserrao@users.noreply.github.com>
Date: Wed, 6 Nov 2024 04:56:53 -0500
Subject: [PATCH] fix(python): Fix typing for SchemaDefinition (#19647)

---
 py-polars/polars/_typing.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/py-polars/polars/_typing.py b/py-polars/polars/_typing.py
index 67a06a2c689e..d614c1276e8f 100644
--- a/py-polars/polars/_typing.py
+++ b/py-polars/polars/_typing.py
@@ -72,7 +72,7 @@ def __arrow_c_stream__(self, requested_schema: object | None = None) -> object:
 ]
 
 SchemaDefinition: TypeAlias = Union[
-    Mapping[str, Union[PolarsDataType, PythonDataType]],
+    Mapping[str, Union[PolarsDataType, PythonDataType, None]],
     Sequence[Union[str, tuple[str, Union[PolarsDataType, PythonDataType, None]]]],
 ]
 SchemaDict: TypeAlias = Mapping[str, PolarsDataType]