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36 lines
779 B
Python
36 lines
779 B
Python
from functools import cached_property
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class Person:
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def __init__(self, height, bmi):
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self.height = height
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self.bmi = bmi
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@cached_property
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def weight(self):
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print("====正在执行复杂计算====")
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return self.height ** 2 * self.bmi
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p = Person(1.75, 22)
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# 第一次访问：执行函数，打印日志，保存结果
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print(p.weight)
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# 第二次访问：直接读缓存！不会打印日志，不重新计算
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print(p.weight)
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print(p.weight)
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class Person2:
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def __init__(self, height, bmi):
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self.height = height
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self.bmi = bmi
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@property
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def weight(self):
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print("====每次都重新计算====")
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return self.height ** 2 * self.bmi
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p2 = Person2(1.75,22)
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print(p2.weight)
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print(p2.weight)
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