def load_config_from_stream(stream, increment_id=None):
  config_globals = {}
  config = bulkloader_parser.load_config(stream, config_globals)
  importer_classes = []
  exporter_classes = []
  for transformer in config.transformers:
    importer, exporter = create_transformer_classes(transformer, config_globals,
                                                    increment_id)
    if importer:
      importer_classes.append(importer)
    if exporter:
      exporter_classes.append(exporter)

  return importer_classes, exporter_classes
C{writeSequence} with an element in the sequence of type unicode raises
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/bulkload/bulkloader_config.py/load_config_from_stream--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/test/test_tcp.py/WriteSequenceTestsMixin.test_writeSequenceWithUnicodeRaisesException