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How to Mock DynamoDB with a Simple Dict Store in Python

A lightweight in-memory DynamoDB mock that stores items in a dict and supports put, get, and query-by-value operations for local testing.

dynamodb mock testing
Python 
import json
from typing import Any, Dict, Optional


class MockDynamoDB:
    def __init__(self) -> None:
        self._store: Dict[str, Dict[str, Any]] = {}

    def put_item(self, table_name: str, item: Dict[str, Any]) -> None:
        key = str(item.get("id"))
        if table_name not in self._store:
            se…
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