minesweeper.py 文件源码

def convert(cls, ctx, arg):
        lowered = arg.lower()
        try:
            return cls[lowered]
        except KeyError:
            difficulties = '\n'.join(str(m).lower() for m in cls)
            raise commands.BadArgument(f'"{arg}"" is not a valid level. Valid difficulties:\n{difficulties}') from None