Python3 で Cloud Firestore のデータを更新 (Update)

#! /usr/bin/python
#
import sys
import firebase_admin
from firebase_admin import credentials
from firebase_admin import firestore

# ------------------------------------------------------------------
sys.stderr.write("*** 開始 ***\n")
#
key_in = sys.argv[1]
population_in = int(sys.argv[2])
#
print("%s\t%d" % (key_in, population_in))
#
project = 'project-aaa'
#
cred = credentials.ApplicationDefault()
firebase_admin.initialize_app(cred, {
  'projectId': project,
})

db = firestore.client()
#
city_ref = db.collection('cities').document(key_in)
city_ref.update({'population': population_in})
#
sys.stderr.write("*** 終了 ***\n")
# ------------------------------------------------------------------

export GOOGLE_APPLICATION_CREDENTIALS="***.json"
./firestore_update.py t0922 98456200

$ python --version
Python 3.8.6