fix: support ZeroGPU Python 3.10 runtime

README.md

@@ -5,7 +5,7 @@ colorFrom: red
 colorTo: yellow
 sdk: gradio
 sdk_version: 5.49.1
-python_version: '3.11'
+python_version: '3.10'
 app_file: app.py
 pinned: false
 ---
@@ -63,7 +63,7 @@ For local use with all dependencies installed:
 PYTHONPATH=openpi_runtime python app.py
 ```
 
-The full OpenPI/JAX stack requires Python 3.11 and a compatible CUDA 12 GPU.
+The Space runs on Python 3.10 and requires a compatible CUDA 12 GPU.
 
 ## Optional real-checkpoint smoke test
 

openpi_runtime/openpi/shared/download.py

@@ -188,7 +188,7 @@ def _ensure_permissions(path: pathlib.Path) -> None:
 
 def _get_mtime(year: int, month: int, day: int) -> float:
     """Get the mtime of a given date at midnight UTC."""
-    date = datetime.datetime(year, month, day, tzinfo=datetime.UTC)
+    date = datetime.datetime(year, month, day, tzinfo=datetime.timezone.utc)
     return time.mktime(date.timetuple())
 
 

tests/test_space_config.py

@@ -8,7 +8,7 @@ def test_space_metadata_and_runtime_files():
     readme = (ROOT / "README.md").read_text()
     requirements = (ROOT / "requirements.txt").read_text()
     assert "sdk_version: 5.49.1" in readme
-    assert "python_version: '3.11'" in readme
+    assert "python_version: '3.10'" in readme
     assert "app_file: app.py" in readme
     assert "gradio==5.49.1" in requirements
     assert "huggingface-hub==0.36.2" in requirements
@@ -24,3 +24,9 @@ def test_vendored_config_contains_state_conditioned_ur_policy():
     source = (ROOT / "openpi_runtime/openpi/training/config.py").read_text()
     assert 'name="pi05_ur_demo_state"' in source
     assert "LeRobotURDataConfig" in source
+
+
+def test_vendored_download_is_python_310_compatible():
+    source = (ROOT / "openpi_runtime/openpi/shared/download.py").read_text()
+    assert "datetime.UTC" not in source
+    assert "datetime.timezone.utc" in source