observable

library1.0.3pypypi✓ verified 85d ago

Minimalist event system for Python, inspired by the Observable pattern. Current version 1.0.3. Low release cadence; last stable release in 2017.

observability

pip install observable

github ↗package ↗

INSTALL

IMPORT

SIG · OBSERVABLE

observable

observabilitypythonv1.0.3

Install

1.6s avg

Import

11ms

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 v1.0.3 · 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 0.012s · 17.8MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.6s · import 0.006s · 18MB

16MB installed

● package 16MB

Code

Verified usage

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

Observable

✓ from observable import Observable

✗ from observable import Observer

The class is Observable, not Observer.

Create a subclass of Observable, register a callback with .on(), and fire events with .trigger().

from observable import Observable class MyObservable(Observable): pass obj = MyObservable() def callback(data): print(f"Event received: {data}") obj.on('change', callback) obj.trigger('change', 'Hello, world!')

Debug

Known issues

breakingObservable is not a mixin; you must subclass it. Adding Observable as a base class to an existing class may cause metaclass conflicts.

fix

Use class MyClass(Observable): instead of combining with other base classes unless using compatible metaclasses.

affects: all

gotchaEvents are identified by string names. Triggering an event with no listeners will silently do nothing. No error is raised.

fix

Verify listeners are registered before triggering, or implement a check if needed.

affects: all

gotchaCallback arguments are passed as positional arguments to trigger. Ensure your callback signature matches the number of arguments you pass; otherwise, a TypeError will occur.

fix

Use *args and **kwargs in callback to handle any number of arguments, or strictly match signatures.

affects: all

deprecatedThe library has not been updated since 2017. The API is stable but no longer maintained. Python 3.6+ compatibility may require testing.

fix

Consider alternative libraries like 'pyee' or 'blinker' for active support.

affects: >=1.0.0

Errors

Common errors & fixes

ImportError: cannot import name 'Observer' from 'observable'

There is no class named Observer; the correct class is Observable.

fix

Change import to: from observable import Observable

TypeError: callback() takes 1 positional argument but 2 were given

The callback expects a single argument but trigger is called with two arguments (event name and data). The callback receives all arguments passed to trigger after the event name.

fix

Adjust callback signature to accept the correct number of arguments, e.g., def callback(event_name, data): or use *args.

Upgrade

Version history

1.0.3latest on PyPI · released Sep 20, 2018

Audit

Dependencies

No dependency data recorded yet.

Agent activity

12 hits · last 30 days

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OpenAI (training)

Resources

githubhttps://github.com/timofurrer/observable ↗

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