collection.find({"$and":[ {"cwc":{"$exists": True}}, {"cwc":{"$ne": ""}}]})

Pymongo using $exists - Stack Overflow

https://stackoverflow.com/questions/26895213/pymongo-using-exists

This works for me. collection.find({"cwc":{"$exists":True}}). The only difference is removed the first argument.

$exists — MongoDB Manual

https://docs.mongodb.com/manual/reference/operator/query/exists/

This query will select all documents in the inventory collection where the qty field exists and its value does not equal 5 or 15 . Null Values¶. The following examples ...

How to check in PyMongo if collection exists and if exists empty ...

https://stackoverflow.com/questions/9822575/how-to-check-in-pymongo-if-collection-exists-and-if-exists-empty-remove-all-fro

Sample code in Pymongo with comment as explanation: from pymongo import MongoClient connection = MongoClient('localhost', 27017) ...

How to use Python to Check if an Index Exists for a MongoDB ...

https://kb.objectrocket.com/mongo-db/how-to-use-python-to-check-if-an-index-exists-for-a-mongodb-collection-440

coding: utf-8 -*- # import the MongoClient class from the library from pymongo ...

Check Field Exist in Pymongo - Stack Overflow

https://stackoverflow.com/questions/41490143/check-field-exist-in-pymongo/41490267

You're passing three arguments to the find method. I assume you intended to pass a filter and a projection only. Try this: collection.find({"sex":"Male", ...

gridfs – Tools for working with GridFS — PyMongo v1.8.1 ...

https://api.mongodb.com/python/1.8.1/api/gridfs/index.html

The gridfs package is an implementation of GridFS on top of pymongo, exposing a file-like interface. ... Check if a file exists in this instance of GridFS. The file to ...

Checking if a document exists - MongoDB slow findOne vs find

https://blog.serverdensity.com/checking-if-a-document-exists-mongodb-slow-findone-vs-find/

Mar 14, 2013 ... MongoDB findOne is orders of magnitude slower than find if you just checking whether a document exists. Learn when you should use findOne ...

gridfs – Tools for working with GridFS — PyMongo v1.11 ...

https://api.mongodb.com/python/1.11/api/gridfs/index.html

file_id : "_id" of the file to delete. New in version 1.6. exists(document_or_id= None, **kwargs)¶. Check ...

Tools for working with GridFS — PyMongo 3.11.3 documentation

https://pymongo.readthedocs.io/en/stable/api/gridfs/index.html

Check if a file exists in this instance of GridFS . The file to check for can be specified by the value of its _id key, or by passing in a query document. A ...

gridfs – Tools for working with GridFS — PyMongo 2.8 documentation

https://api.mongodb.com/python/2.8/api/gridfs/index.html

Check if a file exists in this instance of GridFS. The file to check for can be specified by the value of its _id key, or by passing in a query document. A query ...