步骤中用的函数模板过时了，需要把代码修改一下 
替换handler函数，event中提取数据的方式变了： 
def handler(event, context):
    ak = context.getSecurityAccessKey()
    sk = context.getSecuritySecretKey()
    st = context.getSecurityToken()
    if ak == "" or sk == "" or st == "":
        context.getLogger().error('Failed to access OBS because no temporary '
                                  'AK, SK, or token has been obtained. Please '
 ...