From 0cc2abcd30649c15e9c6e5700db0919169b04e8f Mon Sep 17 00:00:00 2001
From: "David P. Kleinschmidt" <david@kleinschmidt.name>
Date: Fri, 25 Jul 2025 11:25:08 -0400
Subject: [PATCH] Use backwards-compatible union type syntax in Python client
 (#6277)

---
 python-client/wmill/wmill/s3_reader.py | 6 +++---
 python-client/wmill/wmill/s3_types.py  | 7 +++++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/python-client/wmill/wmill/s3_reader.py b/python-client/wmill/wmill/s3_reader.py
index 557bc9d200..6ff93db8ef 100644
--- a/python-client/wmill/wmill/s3_reader.py
+++ b/python-client/wmill/wmill/s3_reader.py
@@ -1,11 +1,11 @@
 from io import BufferedReader, BytesIO
-from json import JSONDecodeError
+from typing import Optional, Union
 
 import httpx
 
 
 class S3BufferedReader(BufferedReader):
-    def __init__(self, workspace: str, windmill_client: httpx.Client, file_key: str, s3_resource_path: str | None, storage: str | None):
+    def __init__(self, workspace: str, windmill_client: httpx.Client, file_key: str, s3_resource_path: Optional[str], storage: Optional[str]):
         params = {
             "file_key": file_key,
         }
@@ -61,7 +61,7 @@ class S3BufferedReader(BufferedReader):
         self._context_manager.__exit__(*args)
 
 
-def bytes_generator(buffered_reader: BufferedReader | BytesIO):
+def bytes_generator(buffered_reader: Union[BufferedReader, BytesIO]):
     while True:
         byte = buffered_reader.read(50 * 1024)
         if not byte:
diff --git a/python-client/wmill/wmill/s3_types.py b/python-client/wmill/wmill/s3_types.py
index b1736db9e9..5778eda021 100644
--- a/python-client/wmill/wmill/s3_types.py
+++ b/python-client/wmill/wmill/s3_types.py
@@ -1,7 +1,10 @@
+from typing import Optional
+
+
 class S3Object(dict):
     s3: str
-    storage: str | None
-    presigned: str | None
+    storage: Optional[str]
+    presigned: Optional[str]
 
     def __getattr__(self, attr):
         return self[attr]