magicattr

library0.1.6pypypi✓ verified 24d ago

MagicAttr (current version 0.1.6) provides an enhanced `getattr` and `setattr` functionality for Python, capable of navigating and modifying attributes within deeply nested objects, lists, and dictionaries. It stands out by retaining the original cause of failure instead of exclusively raising an `AttributeError`, offering more granular error information. The library sees infrequent but active maintenance, with the latest release in January 2022.

serialization

pip install magicattr

github ↗package ↗

INSTALL

IMPORT

SIG · MAGICATTR

magicattr

serializationpythonv0.1.6

Install

1.5s avg

Import

10ms

Disk

16MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.1.6 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.006s · 17.8MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.5s · import 0.006s · 18MB

16MB installed

● package 16MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

get

✓ from magicattr import get

✗ from magicattr import magicattr

set

✓ from magicattr import set

delete

✓ from magicattr import delete

Demonstrates getting, setting, and deleting nested attributes using string paths, including auto-creation of intermediate dictionary structures.

from magicattr import magicattr class Person: def __init__(self, name, age, settings=None, friends=None): self.name = name self.age = age self.settings = settings if settings is not None else {} self.friends = friends if friends is not None else [] bob = Person("Bob", 30, {'preferences': {'theme': 'dark'}}) jill = Person("Jill", 25, friends=[Person("Jack", 28), Person("Jane", 27)]) # Get a nested attribute theme = magicattr.get(bob, 'settings.preferences.theme') print(f"Bob's theme: {theme}") # Set a nested attribute magicattr.set(bob, 'age', 32) print(f"Bob's new age: {bob.age}") magicattr.set(jill, 'friends[0].age', 29) print(f"Jill's first friend's new age: {jill.friends[0].age}") # Delete a nested attribute magicattr.delete(jill, 'friends[0]') print(f"Jill's friends after deletion: {[f.name for f in jill.friends] if jill.friends else 'None'}") # Demonstrate setting a new deeply nested attribute, creating intermediate dicts magicattr.set(bob, 'address.city', 'New York') print(f"Bob's city: {bob.address.city}")

Debug

Known issues

gotchaMagicAttr's path parsing does not support advanced Python syntax such as slicing (e.g., `list[1:3]`), arbitrary expressions (e.g., `list[0+1]`), function calls (e.g., `list.pop(0)`), or `eval` related constructs within the attribute string. Attempting to use these will result in `NotImplementedError` or `ValueError`.

fix

Ensure attribute paths are simple dot-separated or bracket-indexed strings. Perform complex logic outside the `magicattr` call.

affects: All versions

gotchaUnlike standard `getattr`/`setattr` which consistently raise `AttributeError` for missing or invalid attributes, `magicattr` aims to return the underlying exception (e.g., `KeyError` for dicts, `IndexError` for lists) or `None` for missing attributes/indices. This can lead to different error handling patterns than typically expected from Python's built-in attribute access.

fix

Inspect the return value carefully for `None` or specific exceptions like `KeyError` or `IndexError` when an attribute might not exist, rather than solely catching `AttributeError`.

affects: All versions

gotchaWhen using `magicattr.set()` to create new, deeply nested structures (e.g., `magicattr.set(obj, 'new_attr.nested_key', 'value')`), the library automatically infers and creates intermediate `dict` or `list` types as needed. While convenient, this might not always align with expectations if a different custom object type was desired for those intermediate steps.

fix

Explicitly initialize intermediate objects with the desired types before using `magicattr.set()` if `dict` or `list` are not appropriate defaults.

affects: All versions

Upgrade

Version history

0.1.6latest on PyPI · released Jan 25, 2022

Audit

Dependencies

No dependency data recorded yet.

Agent activity

12 hits · last 30 days

node

Amazon

Resources

githubhttps://github.com/frmdstryr/magicattr ↗

packagehttps://pypi.org/project/magicattr/ ↗