I am using MongoDB 3.4 and Python 2.7. I have retrieved a document from the database and I can print it and the structure indicates it is a Python dictionary. I would like to write out the content of this document as a JSON file. When I create a simple dictionary like `d = {"one": 1, "two": 2}` I can then write it to a file using `json.dump(d, open("text.txt", 'w'))`
However, if I replace d in the above code with the the document I retrieve from MongoDB I get the error 

> 
> ObjectId is not JSON serializable
> 
> 
> 

Suggestions?