code: def batch_gen(data, batch_size):
      '''
      Usage::
          for batch in batch_gen(iter, 100):
              do_something(batch)
      '''
      data = data or []
      for i in range(0, len(data), batch_size):
          yield data[i:i + batch_sizef batch_gen(data, batch_size):
      '''
      Usage::
          for batch in batch_gen(iter, 100):
              do_something(batch)
      '''
      data = data or []
      for i in range(0, len(data), batch_size):
          yield data[i:i + batch_size]
docs: Usage::
          for batch in batch_gen(iter, 100):
              do_something(batch)