Bigtable and float values #2614

TypeError: 0.67 could not be converted to bytes

/home/dmitry/Projects/demo/storm/libs/db/models.py in save(self, record, instance_id)
    205             for col in columns:
    206                 row.set_cell(
--> 207                     column_family, col, getattr(record, col, None)
    208                 )
    209         row.commit()
/home/dmitry/Projects/experiments/storm/petrel/chapter3/example1/petrel/lib/python2.7/site-packages/gcloud/bigtable/row.pyc in set_cell(self, column_family_id, column, value, timestamp)
    300         """
    301         self._set_cell(column_family_id, column, value, timestamp=timestamp,
--> 302                        state=None)
    303 
    304     def delete(self):

/home/dmitry/Projects/experiments/storm/petrel/chapter3/example1/petrel/lib/python2.7/site-packages/gcloud/bigtable/row.pyc in _set_cell(self, column_family_id, column, value, timestamp, state)
    126         if isinstance(value, six.integer_types):
    127             value = _PACK_I64(value)
--> 128         value = _to_bytes(value)
    129         if timestamp is None:
    130             # Use -1 for current Bigtable server time.

/home/dmitry/Projects/experiments/storm/petrel/chapter3/example1/petrel/lib/python2.7/site-packages/gcloud/_helpers.pyc in _to_bytes(value, encoding)
    457         return result
    458     else:
--> 459         raise TypeError('%r could not be converted to bytes' % (value,))
    460 
    461