Add more constant "None" objects to Python to avoid boilerplate code
Project description
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.
Project details
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
Built Distribution
Hashes for python_none_objects-1.1.1.tar.gz
Algorithm | Hash digest | |
---|---|---|
SHA256 | b25e4fbc3c9f8f4c58f6cdf362777c0117620d6bbcb82e5080d779f4013625b7 |
|
MD5 | 8683b06870099db0e9673d211767207f |
|
BLAKE2b-256 | 35e4b41d05551615408bc4db5ac7befbc9099b3149bce298ac2b7f94f4eb5b7b |
Hashes for python_none_objects-1.1.1-py3-none-any.whl
Algorithm | Hash digest | |
---|---|---|
SHA256 | 1459803b253c640c299ad9ce2cb8630efcf75b071cb3f7b3ac4a168074cddab3 |
|
MD5 | cbb14bde95d511e33b6d274f6ce7daa5 |
|
BLAKE2b-256 | ae60ef0461bba9fba32024ff4d52fe9768479434da1fe36f64ba1efa5ba4d610 |