What’s the difference between a Python “property” and “attribute”?

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Properties are a special kind of attribute. Basically, when Python encounters the following code:

spam = SomeObject()
print(spam.eggs)

it looks up eggs in spam, and then examines eggs to see if it has a __get__, __set__, or __delete__ method — if it does, it’s a property. If it is a property, instead of just returning the eggs object (as it would for any other attribute) it will call the __get__ method (since we were doing lookup) and return whatever that method returns.

More information about Python’s data model and descriptors.

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