Executing update and delete operations using PyMongo

In the previous recipe, we saw how to execute find and insert operations in MongoDB using PyMongo. In this recipe, we will see how update and delete work in Python. We will also see what atomic find and update/delete is and how to execute them. We then conclude by revisiting find operations and looking at some interesting functions of the cursor object.

Getting ready

If you have already seen and completed the previous recipe, you are all set to go. If not, it is recommended that you first complete that recipe before going ahead with this one. Additionally, if you are not sure what read preference and write concern are, refer to the two recipes, Read preference for querying and Write concern and its significance, in Appendix, Concepts for Reference of the book.

Before we get started, let's define a small function that iterates through the cursor and shows the results of a cursor on the console. We will use this function whenever we want...