@tasklets.tasklet
def create_upload_url_async(success_path,
                      max_bytes_per_blob=None,
                      max_bytes_total=None,
                      **options):
  rpc = blobstore.create_rpc(**options)
  rpc = blobstore.create_upload_url_async(success_path,
                                          max_bytes_per_blob=max_bytes_per_blob,
                                          max_bytes_total=max_bytes_total,
                                          rpc=rpc)
  result = yield rpc
  raise tasklets.Return(result)
Async version of create_upload_url().
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/ndb/blobstore.py/create_upload_url_async