List all users and their active access keys

iam_key_scan.py

#!/usr/bin/env python
from __future__ import print_function
import boto3

iam = boto3.resource('iam')

for user in iam.users.all():
    for key in user.access_keys.all():
        if key.status == "Active":
            print("user: {}, key: {}".format(user.name, key.id))