langhelpers.py 文件源码

def assert_arg_type(arg, argtype, name):
    if isinstance(arg, argtype):
        return arg
    else:
        if isinstance(argtype, tuple):
            raise exc.ArgumentError(
                "Argument '%s' is expected to be one of type %s, got '%s'" %
                (name, ' or '.join("'%s'" % a for a in argtype), type(arg)))
        else:
            raise exc.ArgumentError(
                "Argument '%s' is expected to be of type '%s', got '%s'" %
                (name, argtype, type(arg)))