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One of Motor's messiest problems is how to support Futures alongside its original callback-based API:

# Old-fashioned:

def callback(result, error):

    if error:

        print(error)

    else:

        print(result)

def func():

    motor_client.db.collection.insert_one({'_id': 1}, callback=callback)

# Modern:

@gen.coroutine

def func():

    result = yield motor_client.db.collection.insert_one({'_id': 1})

# Contemporary:

async def func():

    result = await motor_client.db.collection.insert_one({'_id': 1})

After a discussion with Tornado's maintainer I've decided that Motor 2.0 should drop the old-fashioned callback interface.

is related to

MOTOR-251 Deprecate callback interface