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Description:

pythonnoneobjects 1.1.11

python-none-objects

A collection of "None" objects

compatible with various Python types

The following code yields warning
for "Default argument value is mutable".
from typing import List, Dict

def foo(some: int, other: List = [], thing: Dict = {}):
for o in other:
bar(some, o, thing)

It is usually recommended to use None instead
(https://stackoverflow.com/questions/41686829
/why-does-pycharm-warn-about-mutable-default-arguments-
how-can-i-work-around-the):
from typing import List, Dict, Optional

def foo(
some: int,
other: Optional[List] = None,
thing: Optional[Dict] = None,
):
if other is None:
other = []
if thing is None:
thing = {}
for o in other:
bar(some, o, thing)

But I prefer less boilerplate code like this:
from typing import Iterable, Mapping
from types import MappingProxyType

def foo(
some: int,
other: Iterable = (),
thing: Mapping = MappingProxyType({}),
):
for o in other:
bar(some, o, thing)

This package introduces constants to make the code more readable:
from typing import Iterable, Mapping
from python_none_objects import NoneIterable, NoneMapping

def foo(
some: int,
other: Iterable = NoneIterable,
thing: Mapping = NoneMapping,
):
for o in other:
bar(some, o, thing)

Be sure to look at the discussions on GitHub:
https://github.com/LLyaudet/python-none-objects/discussions.
There is a poll on the naming convention you would prefer:
https://github.com/LLyaudet/python-none-objects/discussions/2.
And there is a discussion on various ideas
to optimize the code with these constants:
https://github.com/LLyaudet/python-none-objects/discussions/3.
I think it would be better to have this kind of constants
in the standard library.
If you think after reading everything, that it is indeed a good idea,
add a star to this repository to let the rest
of the Python community
know that you would like to see such constant objects
in the language :).
https://github.com/LLyaudet/python-none-objects/
If the project gains popularity, I'll try to propose it officially.