cached_property_decorator_for_class_instance_memoization.py

1from cached_property import cached_property
2
3class Person(object):
4    def __init__(self, name, birthday):
5        self.name = name
6        self.birthday = birthday
7
8    @cached_property
9    def age(self):
10        # calculate age of person
11        print("Calculating age...")
12        return 42  # Simplified for example purposes
13
14# Usage
15p = Person("Daniel Greenfeld", "1982-05-04")
16
17# The first time the property is accessed, the result is calculated
18print(p.age)
19# Calculating age...
20# 42
21
22# Subsequent accesses use the cached value
23print(p.age)
24# 42