'Validates a value as a proper Flow object.
Args:
value: A value to be set on the property.
Raises:
TypeError if the value is not an instance of Flow.'

def _validate(self, value):

    _LOGGER.info('validate:    Got    type    %s', type(value))
    if ((value is not None) and (not isinstance(value, client.Flow))):
        raise TypeError('Property    {0}    must    be    convertible    to    a    flow    instance;    received:    {1}.'.format(self._name, value))
