from googleapiclient.discovery import build
import json
api_key = 'AIzaSyDzHXVBwo9IA0Y_kBHjmoEf9l66ngoj4Ag'

youtube = build('youtube', 'v3', developerKey=api_key)

request = youtube.channels().list(
    part='statistics',
    forUsername='schafer5'
)

response = request.execute()
print(response)