I think there is a problem with projection parameter in find() method

client = MongoClient()
filter={}
project={}

result = client['my_db']['my_collection'].find(
  filter=filter,
  projection=project
)

##### It will return "_id" field of the documents only

I also use the Mongo compass tool to generate this code. But it returns the full-fields results of documents for me, maybe it is due to the compatibility of this tool and pymongo