parseractions.py 文件源码

def __call__(self, parser, namespace, values, option_string=None):
        range = values.split(':')
        if len(range) == 0:
            # Nothing passed, return a zero default
            setattr(namespace, self.dest, (0, 0))
        elif len(range) == 1:
            # Only a single value is present
            setattr(namespace, self.dest, (int(range[0]), int(range[0])))
        elif len(range) == 2:
            # Range of two values
            if int(range[0]) <= int(range[1]):
                setattr(namespace, self.dest, (int(range[0]), int(range[1])))
            else:
                msg = "Invalid range, %s is not less than %s" % \
                    (range[0], range[1])
                raise argparse.ArgumentError(self, msg)
        else:
            # Too many values
            msg = "Invalid range, too many values"
            raise argparse.ArgumentError(self, msg)