ec2Watch.py

import boto3 
import datetime
import time 
ec2 = boto3.client('ec2', region_name='us-east-1')
instances=ec2.describe_instances()
cloudwatch = boto3.client('cloudwatch')
for instance in range(len(instances['Reservations'])):
    instanceID=instances['Reservations'][instance]['Instances'][0]['InstanceId']
    instanceType = instances['Reservations'][instance]['Instances'][0]['InstanceType']
    for tag in instances['Reservations'][instance]['Instances'][0]['Tags']:
        if tag['Key'] == 'Name':
            instanceName = tag['Value']
    try:
        cwResponse = cloudwatch.get_metric_statistics(Namespace='AWS/EC2', MetricName='CPUUtilization', Dimensions=[{'Name': 'InstanceId', 'Value': instanceID}, ], StartTime=datetime.datetime.utcnow() - datetime.timedelta(seconds=604800), EndTime=datetime.datetime.utcnow(), Period=604800, Statistics=['Average'])
        CPUAverage = str(round(cwResponse['Datapoints'][0]['Average']), 2)
    except:
        CPUAverage = 'NA'
    print(instanceID, instanceType, instanceName, CPUAverage)