pymitter

library1.1.3pypypiunverified

Python port of the extended Node.js EventEmitter 2 approach providing namespaces, wildcards, and TTL. Currently at version 1.1.3, requires Python >=3.9. Provides an event emitter with support for namespaced events and wildcards. Low release cadence.

devops

pip install pymitter

github ↗homepage ↗

INSTALL

IMPORT

SIG · PYMITTER

pymitter

devopspythonv1.1.3

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Basic usage: create an EventEmitter, register a handler, and emit an event.

from pymitter import EventEmitter ee = EventEmitter() @ee.on('myEvent') def handler1(arg1, arg2): print(f"handler1: {arg1} {arg2}") ee.emit('myEvent', 'arg1', 'arg2') # Output: handler1: arg1 arg2

Debug

Known issues

gotchaThe library uses a wildcard system: '*' matches any single level, '**' matches multiple levels. This is different from many other event libraries.

fix

Use '*' for single-level wildcard and '**' for multi-level in event names.

affects: >=1.0.0

deprecatedThe `prependListener` and `prependOnceListener` methods are deprecated in favor of `on` and `once` with parameter `priority`. Check documentation.

fix

Use `ee.on(event, handler, priority=True)` instead of `prependListener`.

affects: <=1.1.3

breakingVersions prior to 1.0.0 had a different API. The new version uses EventEmitter class and decorators. Old code using `pymitter.EventEmitter()` directly will break if imported incorrectly.

fix

Use `from pymitter import EventEmitter` and `@ee.on()` decorator pattern.

affects: <1.0.0

Errors

Common errors & fixes

AttributeError: module 'pymitter' has no attribute 'EventEmitter'

Importing incorrectly: `import pymitter` then `pymitter.EventEmitter` fails if the module doesn't expose the class directly.

fix

Use `from pymitter import EventEmitter`.

TypeError: 'EventHandler' object is not callable

Trying to call the handler object returned by `ee.on()` as a function instead of using it as a decorator.

fix

Use `@ee.on('event')` as a decorator, or call `ee.on('event', handler)` without parentheses after `on`.

ValueError: wildcard not allowed in namespace

Using wildcards in event names without proper escaping or when wildcard support is disabled.

fix

Ensure wildcards are used only when wildcard mode is enabled (default). If disabled, re-enable with `EventEmitter(wildcard=True)`.

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Version history

1.1.3latest on PyPI · released Jul 11, 2025

Audit

Dependencies

No dependency data recorded yet.

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/riga/pymitter.git ↗

homepagehttps://github.com/riga/pymitter.git ↗