[Python] Get number of documents in collection firestore

Is it possible to count how many documents a collection in Firestore has, using python?

I just found this code

functions.firestore.document('collection/{documentUid}')
.onWrite((change, context) => {

if (!change.before.exists) {
// New document Created : add one to count

db.doc(docRef).update({numberOfDocs: FieldValue.increment(1)});

} else if (change.before.exists && change.after.exists) {
// Updating existing document : Do nothing

} else if (!change.after.exists) {
// Deleting document : subtract one from count

db.doc(docRef).update({numberOfDocs: FieldValue.increment(-1)});

}

return;
});


How I can do this with python?

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