code: def push_and_pull(ti, **kwargs):
      ti.xcom_push(key="pushed_key", value="asdf")
      ti.xcom_pull(key="pushed_key")
  
imports: from __future__ import annotations
  import datetime
  from airflow.models.dag import DAG
  from airflow.operators.python import PythonOperator
label_desc: Use image node_id 1 for calling a global function with example usage: push_and_pull(ti) without return types