parseractions.py 文件源码

def __call__(self, parser, namespace, values, option_string=None):
        # Make sure we have an empty dict rather than None
        if getattr(namespace, self.dest, None) is None:
            setattr(namespace, self.dest, {})

        # Add value if an assignment else remove it
        if '=' in values:
            values_list = values.split('=', 1)
            # NOTE(qtang): Prevent null key setting in property
            if '' == values_list[0]:
                msg = _("Property key must be specified: %s")
                raise argparse.ArgumentTypeError(msg % str(values))
            else:
                getattr(namespace, self.dest, {}).update([values_list])
        else:
            msg = _("Expected 'key=value' type, but got: %s")
            raise argparse.ArgumentTypeError(msg % str(values))