Pymongo using $exists

Question

I'm new to pymongo and having trouble using exists. When using

collection.find({}, { "cwc": { "$exists": True }})

I get the following error

Unsupported projection option: $exists

What I'm trying to accomplish is to find all _id and cwc where 'cwc' exists and not empty.

Answer 1

This works for me.

collection.find({"cwc":{"$exists":True}})

The only difference is removed the first argument.