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Title: Get the type from a variable
Type: enhancement Stage:
Components: Versions: Python 3.10
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: FFY00, wlf100220
Priority: normal Keywords:

Created on 2020-12-09 13:39 by wlf100220, last changed 2022-04-11 14:59 by admin.

Messages (2)
msg382792 - (view) Author: dimitri.wei (wlf100220) Date: 2020-12-09 13:39
A similar feature in typescript
const foo: number = 1
type Foo = typeof foo  // type Foo = number

function bar(x: string): void {


type Bar = typeof bar // type Bar = (x: string) => void

The expected way in future python.
from typing import Type
foo: int = 1
Foo = Type[foo]  # equivalent to Foo = int

def bar(x: string) -> None :
Bar = Type[bar]  # equivalent to Bar = Callable[[str], None]
msg382891 - (view) Author: Filipe Laíns (FFY00) * (Python triager) Date: 2020-12-11 21:48
There is type() to get the runtime type.

>>> foo = 1
>>> type(foo)
<class 'int'>

Keep in mind that in Python using type hints does not enforce anything at runtime. You can say `foo: int = 1` but `int` there is just some extra information for type checkers, like mypy, to use.

If you want the type hints, you can use typing.get_type_hints() but this is only available for modules, classes or functions, not variables.
Date User Action Args
2022-04-11 14:59:39adminsetgithub: 86776
2020-12-11 21:48:17FFY00setnosy: + FFY00
messages: + msg382891
2020-12-09 13:48:09wlf100220settitle: Get the type from a var -> Get the type from a variable
2020-12-09 13:47:53wlf100220settitle: Get the type of from a var -> Get the type from a var
2020-12-09 13:41:15wlf100220setcomponents: - Demos and Tools
2020-12-09 13:39:46wlf100220create