Function is_namedtuple

functional/util.py:41–53

Use Duck Typing to check if val is a named tuple. Checks that val is of type tuple and contains the attribute _fields which is defined for named tuples. :param val: value to check type of :return: True if val is a namedtuple

(val)

def is_namedtuple(val):
    """
    Use Duck Typing to check if val is a named tuple. Checks that val is of type tuple and contains
    the attribute _fields which is defined for named tuples.
    :param val: value to check type of
    :return: True if val is a namedtuple
    """
    val_type = type(val)
    bases = val_type.__bases__
    if len(bases) != 1 or bases[0] != tuple:
        return False
    fields = getattr(val_type, "_fields", None)
    return all(isinstance(n, str) for n in fields)


def identity(arg):