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.
Diese Übung ist Teil des Kurses
Introduction to MongoDB in Python
Anleitung zur Übung
- Find all the documents where the
box_officefield exists and store the resulting cursor object asbox_curs. - Turn the cursor object into a Python list and store it as
box.
Interaktive Übung
Vervollständige den Beispielcode, um diese Übung erfolgreich abzuschließen.
# Find all documents where box_office is set
box_curs = mov.find({
"____": {
"____": ____
}
})
# Convert from cursor to list
box = ____
print(box)
print(f"{len(box)}/{mov.count_documents({})} movies have the box_office field.")