lena.py

import json

#JSON_FILE = "lena.json"
with open('lena.json','r') as js:
    data = json.load(js)

lista = data.values()
#print lista

#print data.keys()
for Reservations in data['Reservations']:
    for Instance in Reservations['Instances']:
        print(Instance.get('InstanceId'))
        print(Instance.get('InstanceType'))
        print(Instance.get('PrivateIpAddress'))
        print(Instance.get('PublicIpAddress'))
        print(Instance.get('LaunchTime'))
        print