Iteratively retrieve all IAM users with the groups, roles and date created then save to csv file

aws_iam_users.py

import boto3
iam = boto3.client('iam',aws_access_key_id="XXXX",aws_secret_access_key="XXXX")

user_list = []
users = (iam.get_account_authorization_details(Filter=['User'], MaxItems=1000))

while users['IsTruncated']:
    marker = users['Marker']
    for user_detail in users['UserDetailList']:
        
        policyname = []
        # find each policy attached to the user
        for policy in user_detail['AttachedManagedPolicies']:
            policyname.append(policy['PolicyName'])
          
            user_details = {
            "user": user_detail['UserName'],
            "groups": ", ".join(user_detail['GroupList']),
            "policyname": ", ".join(policyname),
            "created": user_detail['CreateDate']
            }
            user_list.append(user_details)
    users = iam.get_account_authorization_details(Filter=['User'], MaxItems=1000, Marker=marker)

import csv
keys = user_list[0].keys()
with open('aws_users.csv', 'wb') as output_file:
    dict_writer = csv.DictWriter(output_file, keys)
    dict_writer.writeheader()
    dict_writer.writerows(user_list)