TypeError: unsupported operand type(s) for |: Python 3.9 incompatibility in type annotations

Open src/bedrock_flow_manager.py and inspect the annotations at lines 731 and 845, then check how typing imports are organized. Run the documented Python 3.9 command with the sample input; done means the module imports and the command no longer raises this TypeError.

Description

Running bedrock_flow_manager.py on Python < 3.10 raises a TypeError at import time due to use of the X | Y union type syntax introduced in Python 3.10.

Error

Traceback (most recent call last):
File "src/bedrock_flow_manager.py", line 71, in
class BedrockFlowManager:
File "src/bedrock_flow_manager.py", line 731, in BedrockFlowManager
def test_flow(self, flow_id: str, alias_id: str, input_text: str | list, ...
TypeError: unsupported operand type(s) for |: 'type' and 'type'

Reproducible Steps

1. Use Python 3.9 (e.g. default on Amazon Linux 2, macOS system Python)
2. Run python src/bedrock_flow_manager.py --test-input "What is Amazon Bedrock?"

Environment

• Python version: 3.9.x
• Affected file: src/bedrock_flow_manager.py (lines 731, 845)

Fix

Replace str | list and str | dict with Union[str, list] and Union[str, dict] from typing.