Fail to dynamically instantiate AssetOperation in GoogleAds python client

Any idea how I can dynamically instantiate AssetOperation in GoogleAds python client?

I'm getting:

TypeError: 'AssetOperation' object is not callable 

In code:

        for video_name, video_id in video_name_id_list:             # Dynamically create an instance of AssetOperation >           asset_operation = self.asset_operation_type(                 create={                     'name': video_name,                     'youtube_video_asset': {'youtube_video_id': video_id}                 }             ) E           TypeError: 'AssetOperation' object is not callable 

Here are my tries:

or:

When I use this: