问为什么我的存储库对象使用github3.py返回Nonetype？

EN

#!/usr/bin/env python

from github3 import authorize, repository, login
from pprint import PrettyPrinter as ppr
import github3
from getpass import getuser

pp = ppr(indent=4)


username = 'myusername'
password = 'mypassword'
scopes = ['user', 'repo', 'admin:public_key', 'admin:repo_hook']
note = 'github3.py test'
note_url = 'http://github.com/FreddieV4'

print("Attemping authorization...")


token = id = ''
with open('CREDENTIALS.txt', 'r') as fi:
    token = fi.readline().strip()
    id = fi.readline().strip()


print("AUTH token {}\nAUTH id {}\n".format(token, id))


print("Attempting login...\n")
fv4 = login(username, password, token=token)
print("Login successful!", str(fv4), '\n')


print("Attempting auth...\n")
auth = fv4.authorization(id)
print("Auth successful!", auth, '\n')


print("Reading repo...\n")
repo = repository('Django', auth)
print("Repo object...{}\n\n".format(dir(repo)))


print("Repo...{}\n\n".format(repo))
contents = repo.contents('README.md')


pp.pprint('CONTENTS {}'.format(contents))


contents.update('Testing github3.py', contents)

#print("commit: ", commit)