cached_property_decorator_for_one_time_class_computation.py

1from cached_property import cached_property
2
3class Sample(object):
4
5    @cached_property
6    def value(self):
7        """Value will be calculated once, and then the cached value will be used."""
8        print("Calculating value...")
9        return 42
10
11sample = Sample()
12
13# The first time we access the property, it's calculated
14print(sample.value)
15# Calculating value...
16# 42
17
18# The second time we access it, the cached value is returned
19print(sample.value)
20# 42