def fetch_data(blob, start_index, end_index, rpc=None):
  rpc = fetch_data_async(blob, start_index, end_index, rpc=rpc)
  return rpc.get_result()
test with a copied dictionary
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/blobstore/blobstore.py/fetch_data--crossover with--dataset/ETHPy150Open alecthomas/voluptuous/voluptuous/tests/tests.py/test_copy_dict_undefined