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weakrefmethod

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library1.0.3pypypi✓ verified 85d ago

A WeakMethod class for storing bound methods using weak references. Current version 1.0.3, infrequently updated.

devops

pip install weakrefmethod

github ↗homepage ↗

INSTALL

IMPORT

SIG · WEAKREFMETHOD

weakrefmethod

devopspythonv1.0.3

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

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

WeakMethod

✓ from weakrefmethod import WeakMethod

✗ from weakref import WeakMethod

stdlib weakref does not export WeakMethod; only weakrefmethod provides it.

Create a weak reference to a bound method; call returns the method result or None if the object is garbage collected.

from weakrefmethod import WeakMethod class MyClass: def method(self): return 'hello' obj = MyClass() wm = WeakMethod(obj.method) print(wm() if wm() is not None else 'dead')

Debug

Known issues

gotchaWeakMethod only works on bound methods (instance.method). Passing an unbound method or a regular function will raise TypeError.

fix

Ensure the argument is a bound method: obj.method, not Class.method.

affects: all

gotchaThe WeakMethod object is not callable directly in the sense of a proxy; to call the underlying method you must call wm() which returns the bound method or None.

fix

Use wm() to call, not wm (which is a WeakMethod instance).

affects: all

deprecatedNo deprecated features as of 1.0.3; API is stable.

affects: all

Errors

Common errors & fixes

TypeError: cannot create weak reference to 'method' object

Passing an unbound function or a method from a C extension that does not support weak references.

fix

Ensure you pass a bound method from a Python-defined class. Alternatively, use weakref.WeakMethod from Python 3.4+ stdlib if on Python 3.4+.

ImportError: No module named 'weakrefmethod'

Package not installed or Python environment not correct.

fix

Run 'pip install weakrefmethod' and ensure you are using the correct Python interpreter.

Upgrade

Version history

1.0.3latest on PyPI · released Jul 18, 2016

Audit

Dependencies

No dependency data recorded yet.

Agent activity

5 hits · last 30 days

node

Resources

githubhttp://github.com/twang817/weakrefmethod ↗

homepagehttp://github.com/twang817/weakrefmethod ↗