这是因为在Airflow 2.x版本中，PythonOperator中已经没有“conf”参数。相反，可以使用“task_config”参数来访问Airflow变量。您可以使用以下代码示例来访问您的变量：

from airflow import DAG
from airflow.operators.python_operator import PythonOperator
from datetime import datetime

def my_task(ds, **kwargs):
  my_variable = kwargs['task_instance'].xcom_pull(task_ids='my_task_id', key='my_variable_key')
  print(my_variable)

dag = DAG('my_dag', start_date=datetime.now())

task_one = PythonOperator(
    task_id='my_task_id',
    python_callable=my_task,
    provide_context=True,
    dag=dag,
)

task_two = PythonOperator(
    task_id='my_task_two_id',
    python_callable=my_task,
    task_config={
       'my_variable_key': 'my_variable_value'
    },
    provide_context=True,
    dag=dag,
)

task_two << task_one