code: def contains(bank, key):
      '''
      Checks if the specified bank contains the specified key.
      '''
      _init_client()
      query = "SELECT COUNT(data) FROM {0} WHERE bank='{1}' " \
          "AND etcd_key='{2}'".format(_table_name, bank, key)
      cur, _ = run_query(client, query)
      r = cur.fetchone()
      cur.close()
      return r[0] == f contains(bank, key):
      '''
      Checks if the specified bank contains the specified key.
      '''
      _init_client()
      query = "SELECT COUNT(data) FROM {0} WHERE bank='{1}' " \
          "AND etcd_key='{2}'".format(_table_name, bank, key)
      cur, _ = run_query(client, query)
      r = cur.fetchone()
      cur.close()
      return r[0] == 1
docs: Checks if the specified bank contains the specified key.