Can I overwrite the string form of a namedtuple?

Question

For example:

>>> Spoken = namedtuple("Spoken", ["loudness", "pitch"]) >>> s = Spoken(loudness=90, pitch='high') >>> str(s) "Spoken(loudness=90, pitch='high')" 

What I want is:

>>> str(s) 90 

That is I want the string representation to display the loudness attribute. Is this possible ?

Answer 1

Yes, it is not hard to do and there is an example for it in the namedtuple docs.

The technique is to make a subclass that adds its own str method:

>>> from collections import namedtuple >>> class Spoken(namedtuple("Spoken", ["loudness", "pitch"])):         __slots__ = ()         def __str__(self):             return str(self.loudness)  >>> s = Spoken(loudness=90, pitch='high') >>> str(s) '90' 

Update:

You can also used typing.NamedTuple to get the same effect.

from typing import NamedTuple  class Spoken(NamedTuple):          loudness: int     pitch: str          def __str__(self):         return str(self.loudness)