NOTE: This is the full script - not the parts!
==============================================

import requests
import json
import urllib3

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

ISE_HOSTNAME="10.1.1.30"
ISE_API_URL=f"https://{ISE_HOSTNAME}/api/v1"
ISE_USERNAME="admin"
ISE_PASSWORD="1234QWer"

session = requests.Session()
session.auth = (ISE_USERNAME, ISE_PASSWORD)
session.headers.update({
    "Accept": "application/json",
    "Content-Type": "application/json"
})

TIMEOUT=(5,10)
VERIFY=False


def get_endpoints(session):
    response = session.get(ISE_API_URL + "/endpoint", timeout=TIMEOUT, verify=VERIFY)
    print(f"Response HTTP Status Code - {response.status_code}")
    print(f"Response - {response.json()}")


def load_inventory(file):
    with open(file, "r", encoding="utf-8") as f:
        return json.load(f)


def create_endpoints(session, inventory):
    for endpoint in inventory:
        payload = {
            "mac": endpoint["mac"],
            "device_type": endpoint["device_type"],
            "name": endpoint["name"]
        }
        session.post(ISE_API_URL + "/endpoint", json=payload, timeout=TIMEOUT, verify=VERIFY)
        print(f"Endpoint {endpoint[‘name’]} has been created.")

get_endpoints(session)

print(load_inventory("inventory.json"))


inventory = load_inventory("inventory.json")
create_endpoints(session, inventory)

get_endpoints(session)



Improvements:

def load_inventory(file):
    try:
        with open(file, "r", encoding="utf-8") as f:
            return json.load(f)
    except FileNotFoundError:
        raise FileNotFoundError("Inventory file not found")
    except json.JSONDecodeError as e:
        raise ValueError(f"Invalid JSON in {file}")



def get_endpoints(session, size=2):
    all_items = []
    page = 1
    print(f"Reading endpoints in pages of size {size}")

    while True:
        params = {"page": page, "size": size}
        r = session.get(ISE_API_URL + "/endpoint", params=params, timeout=TIMEOUT, verify=VERIFY)
        print(f"GET {r.url} -> {r.status_code}")
        r.raise_for_status()

        data = r.json()
        if not data:
            break

        print(f"Page {page} items = {len(data)}")
        all_items.extend(data)

        if len(data) < size:   # Found the last page
            break

        page += 1

    print(f"Total endpoints fetched: {len(all_items)}")

    




inventory.json:

[
    {
        "mac": "00:11:22:33:44:01",
        "device_type": "laptop",
        "name": "hr-laptop-01"
    },
    {
        "mac": "00:11:22:33:44:02",
        "device_type": "laptop",
        "name": "hr-laptop-02"
    },
    {
        "mac": "00:11:22:33:44:03",
        "device_type": "laptop",
        "name": "hr-laptop-03"
    },
    {
        "mac": "00:11:22:33:44:04",
        "device_type": "laptop",
        "name": "hr-laptop-04"
    },
    {
        "mac": "00:11:22:33:44:05",
        "device_type": "laptop",
        "name": "hr-laptop-05"
    }            
]