Quick and dirty script to find out what EC2 instances are existing in which regions

ec2_explore.py

from subprocess import check_output
from shlex import split
import json


REGIONS = (
    'us-east-2',
    'us-east-1',
    'us-west-1',
    'us-west-2',
    'ap-south-1',
    'ap-northeast-3',
    'ap-northeast-2',
    'ap-southeast-1',
    'ap-southeast-2',
    'ap-northeast-1',
    'ca-central-1',
    'cn-north-1',
    'cn-northwest-1',
    'eu-central-1',
    'eu-west-1',
    'eu-west-2',
    'eu-west-3',
    'eu-north-1',
    'sa-east-1',
    'us-gov-east-1',
    'us-gov-west-1'
)


COMMAND = 'aws ec2 describe-instances --region={region}'


for region in REGIONS:
    command = COMMAND.format(region=region)

    print(region)

    try:
        output = check_output(split(command)).decode('utf-8')

        response = json.loads(output)

        print(len(response['Reservations']))
    except Exception as exc:
        print(f'Calling failed with exception: {exc}')