Using the Python method hasattr() produces different error messages when used in ArcMap 10.7.1 versus ArcGIS Pro 2.5 (beta).

解决办法

There are ArcPy capabilities to allow querying for a layer to get the attribute information. For example, querying 'lyr.dataSource' works as well. Refer to ArcPy - Layer

https://pro.arcgis.com/en/pro-app/arcpy/mapping/layer-class.htm for more information.

重现步骤