from pymatgen.ext.matproj import MPRester
import json
from pprint import pprint

with MPRester("GKDHNwKre8uiowqhPh") as m:


    all_task_ids = {task_id for doc in m.query(criteria={},["task_ids"])
        for task_id in doc.get("task_ids",[])}
        mvc_ids = {task_id for task_id in all_task_ids if "mvc" in task_id}