gistfile1.txt

# Make sure to export the instance ID 
# export instance_id=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)

import boto3
import os
from botocore.exceptions import ClientError
ec2 = boto3.client('ec2', region_name='us-east-1')
volume_info = ec2.describe_volumes(
    Filters=[
        {
            'Name': 'attachment.instance-id',
            'Values': [
                os.getenv('instance_id')
            ]
        }
    ]
)
volume_id = volume_info['Volumes'][0]['VolumeId']
try:
    resize = ec2.modify_volume(
            VolumeId=volume_id,
            Size=40
    )
    print(resize)
except ClientError as e:
    if e.response['Error']['Code'] == 'InvalidParameterValue':
        print('ERROR MESSAGE: {}'.format(e))