human
Here's a good function header given the following:
I wrote the below code

    from sqlalchemy import create_engine
    if (not dialect_name):
        dialect_name = config.db.name
    buffer = []
    def executor(sql, *a, **kw):
        buffer.append(sql)
    def assert_sql(stmts):
        recv = [re.sub('[\\n\\t]', '', str(s)) for s in buffer]
        assert (recv == stmts), recv
    def print_sql():
        d = engine.dialect
        return '\n'.join((str(s.compile(dialect=d)) for s in engine.mock))
    engine = create_engine((dialect_name + '://'), strategy='mock', executor=executor)
    assert (not hasattr(engine, 'mock'))
    engine.mock = buffer
    engine.assert_sql = assert_sql
    engine.print_sql = print_sql
    return engine

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

def mock_engine(dialect_name=None):