Question

Which is the preferred way of defining class properties in Python and why? Is it Ok to use both in one class?

@property
def total(self):
    return self.field_1 + self.field_2

or

total = property(lambda self: self.field_1 + self.field_2)

Answer 1

The decorator form is probably best in the case you’ve shown, where you want to turn the method into a read-only property. The second case is better when you want to provide a setter/deleter/docstring as well as the getter or if you want to add a property that has a different name to the method it derives its value from.