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#!/usr/bin/env python
# coding: utf-8

import json
import sys
import subprocess

output = subprocess.check_output(["docker", "inspect", sys.argv[1] ])  

# print output
# sys.exit()
# print json.loads(output)
result = json.loads(output)[0]['NetworkSettings']['IPAddress']
# result = json.loads(output)[0]['NetworkSettings']['Networks']['blogcluster_default']['IPAddress']
sys.stdout.write(result)