def write(self, stream=''):
        self.app.write(stream)
:param :class:`~oppy.cell.fixedlen.FixedLenCell.Header` header:
dataset/ETHPy150Open quantmind/lux/lux/core/commands/__init__.py/LuxCommand.write--crossover with--dataset/ETHPy150Open nskinkel/oppy/oppy/cell/fixedlen.py/EncryptedCell.__init__