list-all-nacls.py

import boto3
ec2 = boto3.client("ec2")
ec2_resource = boto3.resource('ec2')

for vpc in ec2.describe_vpcs()['Vpcs']:
    vpc = ec2_resource.Vpc(vpc['VpcId'])
    network_acl_iterator = vpc.network_acls.all()
    for i in network_acl_iterator:
        response = ec2.describe_network_acls(
            NetworkAclIds=[
                i.id
            ]
        )
        for acls in response['NetworkAcls']:
            print(acls)