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Attempting to serialize bytes type causes error #5660
Description
PySDK Version
- PySDK V2 (2.x)
- PySDK V3 (3.x)
Describe the bug
When attempting to call the invoke function with a bytes object in the body, it throws an error during serialization. This is because bytes are not treated as a primitive.
sagemaker-python-sdk/sagemaker-core/src/sagemaker/core/utils/utils.py
Lines 523 to 527 in 302b973
sagemaker-python-sdk/sagemaker-core/src/sagemaker/core/utils/utils.py
Lines 275 to 276 in 302b973
To reproduce
from sagemaker.core.utils.utils import serialize
serialize({"body": b'1'})Expected behavior
{'body': b'1'}Screenshots or logs
If applicable, add screenshots or logs to help explain your problem.
System information
A description of your system. Please provide:
- SageMaker Python SDK version: 3.6.0
- Framework name (eg. PyTorch) or algorithm (eg. KMeans): N/A
- Framework version: N/A
- Python version: 3.12.9
- CPU or GPU: N/A
- Custom Docker image (Y/N): N
Additional context
Add any other context about the problem here.
Activity
[-]attempting to serialize bytes type causes Error[/-][+]Attempting to serialize bytes type causes error[/+]fix: Attempting to serialize bytes type causes error (aws#5660)
mohamedzeidan2021 commentedon Sep 1, 2026
Fixed in #5736, released in v3.11.0.
bytesis now treated as a primitive in the serializer (is_not_primitiveincludesbytes), soserialize({"body": b'1'})returns{'body': b'1'}as expected — verified against your repro. You were on 3.6.0, which predates the fix; please upgrade to v3.11.0 or later. Closing as resolved.