def get_chunk_ranges(self, symbol, chunk_range=None, reverse=False):
        """
        Returns a generator of (Start, End) tuples for each chunk in the symbol

        Parameters
        ----------
        symbol: str
            the symbol for the given item in the DB
        chunk_range: None, or a range object
            allows you to subset the chunks by range
        reverse: boolean
            return the chunk ranges in reverse order

        Returns
        -------
        generator
        """
        sym = self._get_symbol_info(symbol)
        if not sym:
            raise NoDataFoundException("Symbol does not exist.")
        c = CHUNKER_MAP[sym[CHUNKER]]

        # all symbols have a segment 0
        spec = {SYMBOL: symbol, SEGMENT: 0}
        if chunk_range is not None:
            spec.update(CHUNKER_MAP[sym[CHUNKER]].to_mongo(chunk_range))

        for x in self._collection.find(spec,
                                       projection=[START, END],
                                       sort=[(START, pymongo.ASCENDING if not reverse else pymongo.DESCENDING)]):
            yield (c.chunk_to_str(x[START]), c.chunk_to_str(x[END]))
def get_chunk_ranges ( self , symbol , chunk_range = None , reverse = False ) : sym = self . _get_symbol_info ( symbol ) if not sym : raise NoDataFoundException ( "Symbol does not exist." ) c = CHUNKER_MAP [ sym [ CHUNKER ] ] spec = { SYMBOL : symbol , SEGMENT : 0 } if chunk_range is not None : spec . update ( CHUNKER_MAP [ sym [ CHUNKER ] ] . to_mongo ( chunk_range ) ) for x in self . _collection . find ( spec , projection = [ START , END ] , sort = [ ( START , pymongo . ASCENDING if not reverse else pymongo . DESCENDING ) ] ) : yield ( c . chunk_to_str ( x [ START ] ) , c . chunk_to_str ( x [ END ] ) )
Returns a generator of (Start, End) tuples for each chunk in the symbol

        Parameters
        ----------
        symbol: str
            the symbol for the given item in the DB
        chunk_range: None, or a range object
            allows you to subset the chunks by range
        reverse: boolean
            return the chunk ranges in reverse order

        Returns
        -------
        generator