human
I wrote the below code

    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)

What's a good function header?
assistant
#Here's a good function header.

def drop_keyspace(name, connections=None):