docs: def get_macdext(self, symbol, interval='daily', series_type='close',
                      fastperiod=None, slowperiod=None, signalperiod=None, fastmatype=None,
                      slowmatype=None, signalmatype=None):
          """ Return the moving average convergence/divergence time series 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')
              series_type:  The desired price type in the time series. Four types
                  are supported: 'close', 'open', 'high', 'low' (default 'close')
              fastperiod:  Positive integers are accepted (default=None)
              slowperiod:  Positive integers are accepted (default=None)
              signalperiod:  Positive integers are accepted (default=None)
              fastmatype:  Moving average type for the faster moving average.
                  By default, fastmatype=0. Integers 0 - 8 are accepted
                  (check  down the mappings) or the string containing the math type can
                  also be used.
              slowmatype:  Moving average type for the slower moving average.
                  By default, slowmatype=0. Integers 0 - 8 are accepted
                  (check down the mappings) or the string containing the math type can
                  also be used.
              signalmatype:  Moving average type for the signal moving average.
                  By default, signalmatype=0. Integers 0 - 8 are accepted
                  (check down the mappings) or the string containing the math type can
                  also be used.
  
                  * 0 = Simple Moving Average (SMA),
                  * 1 = Exponential Moving Average (EMA),
                  * 2 = Weighted Moving Average (WMA),
                  * 3 = Double Exponential Moving Average (DEMA),
                  * 4 = Triple Exponential Moving Average (TEMA),
                  * 5 = Triangular Moving Average (TRIMA),
                  * 6 = T3 Moving Average,
                  * 7 = Kaufman Adaptive Moving Average (KAMA),
                  * 8 = MESA Adaptive Moving Average (MAMA)
          """
          _FUNCTION_KEY = "MACDEXT"
          return _FUNCTION_KEY, 'Technical Analysis: MACDEXT', 'Meta Data'