为什么我在 python firebase-admininitialize_app() 上收到此错误？

Question

当我尝试连接 google firebase 实时数据库时，出现此错误：

ValueError: The default Firebase app already exists. This means you called 
initialize_app() more than once without providing an app name as the second argument. In 
most cases you only need to call initialize_app() once. But if you do want to initialize 
multiple apps, pass a second argument to initialize_app() to give each app a unique name.

这是我的代码：

import firebase_admin
from firebase_admin import credentials
from firebase_admin import db

cred = credentials.Certificate('firebase-sdk.json')

firebase_admin.initialize_app(cred, {
'databaseURL': 'https://test-139a6-default-rtdb.firebaseio.com/'
})

Answer 1

您只需初始化（创建）应用程序一次。创建应用程序后，请改用get_app：

# The default app's name is "[DEFAULT]"
firebase_admin.get_app(name='[DEFAULT]')