CustomVolumeInUse.py

import botocore.waiter
import botocore.session


session = botocore.session.get_session()
client = session.create_client('ec2')

VOLUME_ID = ... # e.g. 'vol-049df61146c4d7901'
INSTANCE_ID = ...  # e.g. 'i-1234567890abcdef0'
DEVICE = ... # e.g. '/dev/xvdba'

WAITER_ID = ... # e.g. 'MyWaiter'

model = botocore.waiter.WaiterModel({
    'version': 2,
    'waiters': {
        WAITER_ID: {
            'delay': 15,
            'operation': 'DescribeVolumes',
            'maxAttempts': 40,
            'acceptors': [
                {
                    'expected': True,
                    'matcher': 'path',
                    'state': 'success',
                    'argument': "length(Volumes[?State == 'in-use'].Attachments[] | [?"
                                    f"InstanceId == '{INSTANCE_ID}' &&"
                                    f"Device == '{DEVICE}' &&"
                                    "State == 'attached'"
                                "]) == `1`"
                },
                {
                    'expected': True,
                    'matcher': 'path',
                    'state': 'failure',
                    'argument': "length(Volumes[?State == 'in-use'].Attachments[] | [?"
                                    f"InstanceId != '{INSTANCE_ID}' ||"
                                    f"Device != '{DEVICE}'"
                                "]) > `0`"
                },
                {
                    'expected': 'deleted',
                    'matcher': 'pathAny',
                    'state': 'failure',
                    'argument': 'Volumes[].State'
                },
                {
                    'expected': 'error',
                    'matcher': 'pathAny',
                    'state': 'failure',
                    'argument': 'Volumes[].State'
                }
            ]
        }
    }
})
waiter = botocore.waiter.create_waiter_with_client(WAITER_ID, model, client)
waiter.wait(VolumeIds=[VOLUME_ID])

Just a note for anyone using this as an example line 15 "AndyCloudVolumeAttached" and line 55 "CustomVolumeAttached" need to be the same value, took me a little while of troubleshooting to figure this out

What an unfortunate typo