import unicodedata


class CommonModule:
    @staticmethod
    def is_wide (c: str) -> bool:
        return unicodedata.east_asian_width (c) in ['F', 'W', 'A']

    @classmethod
    def string_width_per_pt (cls, string: str) -> float:
        return sum ([1 if cls.is_wide (c) else .5
                     for c in string.decode ('utf-8')])