Q11

def theme_by_name(theme_name):
    sets_themes = sets.merge(themes, how='left', left_on='theme_id', right_on='id')
    sets_filtered = sets_themes[sets_themes['name_y'] == theme_name][["set_num","name_x","year", "num_parts", "id", "name_y"]]
    sets_filtered.columns = ['set_num', 'name_sets', 'year', 'num_parts', 'theme_id', 'name_themes']
    result = sets_filtered.sort_values('set_num')
    result.reset_index(drop=True, inplace=True)
    return result