boundinstance
boundinstance provides InstanceDescriptor, a descriptor that binds weakly to the instance it was accessed from, so a subclass can carry a reference back to its enclosing object without creating a reference cycle.
Install
pip install boundinstance
Usage
from boundinstance import InstanceDescriptor
class Plot(InstanceDescriptor["Potential"]):
def label(self) -> str:
return f"plot of {self.enclosing.name}"
class Potential:
plot = Plot()
def __init__(self, name: str) -> None:
self.name = name
hernquist = Potential("hernquist")
assert hernquist.plot.label() == "plot of hernquist"
The reference back to the enclosing object is weak, so it doesn't outlive a temporary: bind the enclosing object to a name before reading enclosing from it, or you'll hit a ReferenceError (Potential("hernquist").plot.label() fails; hernquist.plot.label() works because hernquist keeps the object alive).
Compiled wheels
boundinstance ships mypyc-compiled wheels for supported platforms, plus a pure-Python sdist that needs no compiler. boundinstance.COMPILED reports whether the installed build is mypyc-compiled.
1 maintainer
Release files for boundinstance 0.1.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| boundinstance-0.1.1.tar.gz | 115.2 kB | Details |
Built distributions (wheels)
Total release size: 820.3 kB
Release files / boundinstance-0.1.1.tar.gz
| Download URL | boundinstance-0.1.1.tar.gz |
|---|---|
| Size | 115.2 kB |
| Tags | Source |
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| Download URL | boundinstance-0.1.1-cp314-cp314-win_amd64.whl |
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| Size | 35.2 kB |
| Tags | CPython 3.14 Windows x86-64 |
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| Size | 76.9 kB |
| Tags | CPython 3.14 Linux glibc 2.17+ x86-64 Linux glibc 2.28+ x86-64 |
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| Size | 59.7 kB |
| Tags | CPython 3.14 macOS 11.0+ ARM64 |
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| Size | 78.3 kB |
| Tags | CPython 3.12 Linux glibc 2.17+ x86-64 Linux glibc 2.28+ x86-64 |
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