pydispatcher

library2.0.7pypypi✓ verified 26d ago

Multi-producer-multi-consumer signal dispatching mechanism for Python, originally from PyDispatcher. Version 2.1.2 is actively maintained via the Scrapy project. Releases are infrequent.

communication workflow

pip install PyDispatcher

github ↗package ↗

INSTALL

IMPORT

SIG · PYDISPATCHER

pydispatcher

communicationpythonv2.0.7

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 v2.0.7 · 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 0.008s · 17.9MB

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.

dispatcher

✓ from pydispatch import dispatcher

✗ from pydispatcher import dispatcher

The package name on PyPI is 'PyDispatcher', but the module is 'pydispatch'.

Basic signal dispatch example.

from pydispatch import dispatcher def callback(signal, sender): print(f"Received signal {signal} from {sender}") dispatcher.connect(callback, signal="my_signal") dispatcher.send(signal="my_signal", sender="app")

Debug

Known issues

gotchaImport path confusion: install with 'pip install PyDispatcher' but import from 'pydispatch'.

fix

Use 'from pydispatch import dispatcher' consistently.

affects: all

gotchaSender requirement: the 'sender' argument in connect() and send() can be None or any object; omitting it may cause unexpected behavior.

fix

Always specify sender explicitly (e.g., sender='myapp') to avoid confusion.

affects: all

deprecatedWeak references: by default, receivers are stored via weak references. If the callback is a bound method or a lambda, it may be garbage-collected before signal dispatch.

fix

Use 'dispatcher.connect(callback, signal='...', weak=False)' to keep a strong reference.

affects: all

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'pydispatcher'

Attempted to import 'pydispatcher' instead of 'pydispatch'.

fix

Use 'from pydispatch import dispatcher' after installing PyDispatcher.

ValueError: Signal 'my_signal' is not registered

The signal was referenced before any connect() or send() call; signals are not pre-registered.

fix

Call dispatcher.connect() or dispatcher.send() with the signal string; it is automatically registered.

Upgrade

Version history

2.0.7latest on PyPI · released Feb 17, 2023

Audit

Dependencies

No dependency data recorded yet.

Agent activity

40 hits · last 30 days

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Resources

githubhttps://github.com/mcfletch/pydispatcher ↗

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