@av._output_format<EOL><INDENT>@av._call_api_on_func<EOL>def get_atr(self, symbol, interval='<STR_LIT>', time_period=<NUM_LIT:20>):<DEDENT>
_FUNCTION_KEY = "<STR_LIT>"<EOL>return _FUNCTION_KEY, '<STR_LIT>', '<STR_LIT>'<EOL>
Return the average true range values in two json objects as
        data and meta_data. It raises ValueError when problems arise

        Keyword Arguments:
            symbol:  the symbol for the equity we want to get its data
            interval:  time interval between two conscutive values,
                supported values are '1min', '5min', '15min', '30min', '60min', 'daily',
                'weekly', 'monthly' (default 'daily')
            time_period:  How many data points to average (default 20)