propcache_cached_property_decorator_quickstart_example.py

1from propcache import cached_property, underlying_property
2
3class MyClass:
4    def __init__(self):
5        self._value = 0
6
7    @underlying_property
8    def value(self):
9        return self._value
10
11    @cached_property
12    def squared_value(self):
13        print("Computing squared value...")
14        return self.value ** 2
15
16# Usage
17obj = MyClass()
18obj._value = 4
19
20# First access: computes the value
21print(obj.squared_value)  # Output: Computing squared value... 16
22
23# Second access: returns cached value
24print(obj.squared_value)  # Output: 16