Orrery
A framework for supporting MVC and observer patterns in Python
Install
pip install orrery
Update
pip install --update orrery
Documentation
Quick start
See the Tutorial page for more information
Create a model containing an initial value
from orrery.models import ValueModel
my_model = ValueModel(value=5)
Read or set the model value
my_model.value = 6
print(my_model.value)
Constant model:
from orrery.models import ConstantModel
my_model = ConstantModel(value=5)
Model containing a class (i.e. store without copying)
from orrery.models import ClassModel
my_object = MyClass()
my_model = ClassModel(my_object)
Check if a model has been given a value:
print(my_model.has_value())
Observe changes to a model:
class CallbackClass:
def value_changed(self, model):
print(f"New value: {model.value}")
callback_class = CallbackClass()
my_model.add_value_changed_listener(callback_class.value_changed)
Create a model which depends on other models:
from orrery.models import DependentModel, ValueModel
model_a = ValueModel(value=2)
model_b = ValueModel(value=3)
sum_model = DependentModel(
dependencies=dict(model_a=model_a, model_b=model_b),
get_result=lambda dependencies: dependencies["model_a"].value + dependencies["model_b"].value
)
print(sum_model.value)
Source code
License
See license file
Copyright
© 2025 Code Choreography Limited
1 maintainer
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