class_docstr: A generic way to store and retrieve arbitrary content or settings as a simple key/value store.
class_docstr_tok: ["A","generic","way","to","store","and","retrieve","arbitrary","content","or","settings","as","a","simple","key\/value","store","."]
docstr: Delete an Airflow Variable for a given key.
  
  :param key: Variable Keys
docstr_tok: ["Delete","an","Airflow","Variable","for","a","given","key",".",":","param","key",":","Variable","Keys"]
code: def delete(key: str, session: Session = None) -> int:
      """Delete an Airflow Variable for a given key.
  
      :param key: Variable Keys
      """
      rows = session.execute(
          delete(Variable).where(Variable.key == key)
      ).rowcount
      SecretCache.invalidate_variable(key)
      return rows
  
imports: from __future__ import annotations
  import json
  import logging
  from typing import TYPE_CHECKING, Any
  from sqlalchemy import Boolean, Column, Integer, String, Text, delete, select
  from sqlalchemy.dialects.mysql import MEDIUMTEXT
  from sqlalchemy.orm import declared_attr, reconstructor, synonym
  from airflow.api_internal.internal_api_call import internal_api_call
  from airflow.configuration import ensure_secrets_loaded
  from airflow.models.base import ID_LEN, Base
  from airflow.models.crypto import get_fernet
  from airflow.secrets.cache import SecretCache
  from airflow.secrets.metastore import MetastoreBackend
  from airflow.utils.log.logging_mixin import LoggingMixin
  from airflow.utils.log.secrets_masker import mask_secret
  from airflow.utils.session import provide_session
label_desc: Use image node_id 11 for calling the Variable obj's underlying member method code with example usage: obj.delete(key, session) and returns: rows