airflow/providers/celery/executors/__init__.py

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from __future__ import annotations

import packaging.version

from airflow import __version__ as airflow_version
from airflow.exceptions import AirflowOptionalProviderFeatureException

base_version = packaging.version.parse(airflow_version).base_version

if packaging.version.parse(base_version) < packaging.version.parse("2.7.0"):
    raise AirflowOptionalProviderFeatureException(
        "Celery Executor from Celery Provider should only be used with Airflow 2.7.0+.\n"
        f"This is Airflow {airflow_version} and Celery and CeleryKubernetesExecutor are "
        f"available in the 'airflow.executors' package. You should not use "
        f"the provider's executors in this version of Airflow."
    )