在namedtuple中输入提示 - Python 实用宝典

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问题：在namedtuple中输入提示

考虑以下代码：

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

上面的代码只是演示我正在尝试实现的方法。我想namedtuple使用类型提示。

您知道如何以一种优雅的方式达到预期效果吗？

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?

从3.6开始，类型为命名元组的首选语法为

from typing import NamedTuple

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

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

编辑从Python 3.7开始，请考虑使用dataclasses（您的IDE可能尚不支持它们进行静态类型检查）：

from dataclasses import dataclass

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

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

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

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

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

来自文档

类型版本的namedtuple。

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

仅在Python 3.5及更高版本中存在

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