'Get the column type for the parser from `self.column_types` or `None`
if the type is unavailable.
:param index: the column index
:returns: string name of type (e.g. \'float\', \'int\', etc.)'

def get_column_type(self, index):

    try:
        return self.column_types[index]
    except IndexError:
        return None
