code: def drop_keyspace(name, connections=None):
      
      if not _allow_schema_modification():
          return
  
      if connections:
          if not isinstance(connections, (list, tuple)):
              raise ValueError('Connections must be a list or a tuple.')
  
      def _drop_keyspace(name, connection=None):
          cluster = get_cluster(connection)
          if name in cluster.metadata.keyspaces:
              execute("DROP KEYSPACE {0}".format(metadata.protect_name(name)), connection=connection)
  
      if connections:
          for connection in connections:
              _drop_keyspace(name, connection)
      else:
          _drop_keyspace(name)
docs: Drops a keyspace, if it exists.
  
      *There are plans to guard schema-modifying functions with an environment-driven conditional.*
  
      **This function should be used with caution, especially in production environments.
      Take care to execute schema modifications in a single context (i.e. not concurrently with other clients).**
  
      :param str name: name of keyspace to drop
      :param list connections: List of connection names