How to increment Firestore field value in python?

Question

shard_ref.update("count", firebase.firestore.FieldValue.increment(1));

I am looking for way to increment and update in python, I am not abe to even update it with a predefined value in python. the doc doesn't specify any python samples. I am using firebase_admin sdk like this,

import firebase_admin
from firebase_admin import credentials
from firebase_admin import firestore

for more check docs https://firebase.google.com/docs/firestore/solutions/counters