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name Punditsdkoslkdosdkoskdo

Type hints in namedtuple

Consider following piece of code:

from collections import namedtuple
point = namedtuple("Point", ("x:int", "y:int"))

The Code above is just a way to demonstrate as to what I am trying to achieve. I would like to make namedtuple with type hints.

Do you know any elegant way how to achieve result as intended?

The prefered Syntax for a typed named tuple since 3.6 is

from typing import NamedTuple

class Point(NamedTuple):
    x: int
    y: int = 1  # Set default value

Point(3)  # -> Point(x=3, y=1)

Edit Starting Python 3.7, consider using dataclasses (your IDE may not yet support them for static type checking):

from dataclasses import dataclass

class Point:
    x: int
    y: int = 1  # Set default value

Point(3)  # -> Point(x=3, y=1)
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      • 2
    • @JohnE; The OP specifically asked for named tuples. Yes, many use cases of named tuples will be better served by data classes. But to quote the excellent Why not namedtuples: If you want a tuple with names, by all means: go for a namedtuple
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    • Using dataclasses, it is not possible to deconstruct the resulting object like you could a Tuple
      • 1
    • A tuple is immutable. A dataclass is not (by default) It does have the frozen flag which gets close to tuple's behaviour. Just something to be aware of.

You can use typing.NamedTuple

From the docs

Typed version of namedtuple.

>>> import typing
>>> Point = typing.NamedTuple("Point", [('x', int), ('y', int)])

This is present only in Python 3.5 onwards

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