Cacher is the code snippet organizer for pro developers

def flattenHierarchicalCol(col,sep = '_'):
    if not type(col) is tuple:
        return col
    else:
        new_col = ''
        for leveli,level in enumerate(col):
            if not level == '':
                if not leveli == 0:
                    new_col += sep
                new_col += level
        return new_col

ds1.columns = ds1.columns.map(flattenHierarchicalCol)

ds1.reset_index(inplace=True)