Update this dictionary with th key-value pairs from a given
        dictionary

def update(self, data):
        """
        Update this dictionary with th key-value pairs from a given
        dictionary
        """
        if not isinstance(data, dict):
            raise TypeError('Data to update must be in a dictionary.')
        for k, v in data.items():
            arr = np.array(v)
            try:
                self[k] = arr
            except TypeError:
                logging.warning("Values under key ({}) not supported by VTK".format(k))
        return