#!/usr/bin/env python3
import sys
import json

if len(sys.argv) < 2:
    print(
        "Usage: met_etractor.py <playlist.json> <key>"
    )
    print("Example: met_extractor.py /tmp/my_playlist.json key")
    sys.exit(1)

with open(sys.argv[1], "r", encoding="utf-8") as f:
    met = json.load(f)
    print(json.dumps(met.get(sys.argv[2], {})))