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How to mock EC2 describe-instances tag filtering in Python

Simulate AWS EC2 describe-instances with tag-based filtering using a mock dataset and conditional list comprehension.

ec2 mock aws
Python 
import json
from datetime import datetime, timezone


def mock_describe_instances(tag_key: str, tag_value: str) -> list[dict]:
    """Simulate EC2 describe-instances with tag filtering."""
    all_instances = [
        {"InstanceId": "i-0abc123", "State": "running", "Tags": [{"Key": "Name", "Value": "web-server"}, {"K…
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