Signified
Documentation: https://dougmercer.github.io/signified
Source Code: https://github.com/dougmercer/signified
A fast, fully-typed Python library for reactive programming.
$ uv add signified
Why care?
signified is a reactive programming library built around four reactive data structures:
Signalstores a mutable value.Computedcalculates a read-only value.Effectruns an action when the values it reads change.Bindingis a stable handle that lets you switch between reactive values without rebuilding calculations that use it.
This allows us to create a network of computation, where one value being modified can trigger other objects to update.
We can write more declarative code, like:
from signified import Signal
x = Signal(3)
x_squared = x ** 2 # currently equal to 9
x.value = 10 # x_squared.value is now 100
Here, x_squared is a Computed object whose value is always equal to x ** 2. Neat!
In the above example, we generated the Computed object on-the-fly using overloaded Python operators like **, but we could have also written it using the computed decorator,
from signified import computed
@computed
def power(x, n):
return x**n
x_squared = power(x, 2) # equivalent to the above
To make something happen when a value changes, we can use an effect:
from signified import effect
@effect
def show(n):
print(n)
watcher = show(x_squared) # prints 100
x.value = 4 # prints 16
watcher.dispose()
Effects run once right away, then again whenever something they read changes until they are explicitly disposed or the effect is garbage collected.
In the above example, x_squared is wired to x. To swap what feeds a calculation without rebuilding it, use a Binding instead of Signal:
from signified import Binding
y = Signal(5)
base = Binding(x) # follows x, for now
cubed = power(base, 3) # currently equal to 64
base.value = y # cubed now follows y, and becomes 125
x.value = 10 # cubed ignores x now
A Signal can't do this. signal.value = y stores the y object itself, not its value.
Together, these data structures allow us to implement a wide variety of capabilities. In particular, I wrote this library to make my animation library keyed easier to maintain and more fun to work with.
Ready to learn more?
Check out the docs at https://dougmercer.github.io/signified, or try it in the Playground.
1 maintainer
Metadata
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Release files for signified 0.7.3
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