<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_hash_value(self, key, field, value, pipeline=False):
 """Set the value of field in a hash stored at key. Args: key (str):
 key (name) of the hash field (str):
 Field within the hash to set value: Value to set pipeline (bool):
 True, start a transaction block. Default false. """

        # FIXME(BMo): new name for this function -> save_dict_value ?
        if pipeline:
            self._pipeline.hset(key, field, str(value))
        else:
            self._db.hset(key, field, str(value))