अभ्यास

The $exists operator

Take a moment and run list(mov.find()): you'll find that some movies have a box_office field while others do not. Let's get a better understanding of the situation.

निर्देश

100 XP

Find all the documents where the box_office field exists and store the resulting cursor object as box_curs.
Turn the cursor object into a Python list and store it as box.

.css-6su6fj{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;}अभ्यास

निर्देश

अभ्यास