折腾：
期间，看到有：
8.13. enum — Support for enumerations — Python 3.5.2 documentation
>>> class Planet(Enum): … MERCURY = (3.303e+23, 2.4397e6) … VENUS = (4.869e+24, 6.0518e6) … EARTH = (5.976e+24, 6.37814e6) … MARS = (6.421e+23, 3.3972e6) … JUPITER = (1.9e+27, 7.1492e7) … SATURN = (5.688e+26, 6.0268e7) … URANUS = (8.686e+25, 2.5559e7) … NEPTUNE = (1.024e+26, 2.4746e7) … def __init__(self, mass, radius): … self.mass = mass # in kilograms … self.radius = radius # in meters … @property … def surface_gravity(self): … # universal gravitational constant (m3 kg-1 s-2) … G = 6.67300E-11 … return G * self.mass / (self.radius * self.radius) … >>> Planet.EARTH.value (5.976e+24, 6378140.0) >>> Planet.EARTH.surface_gravity 9.802652743337129 |
想要搞清楚：
Python中的property的用法和含义
以便于后续去实现enum类中的方法，函数
搜：
python property
参考：
Python @property: How to Use it and Why? – Programiz
python – How does the @property decorator work? – Stack Overflow
properties – Python @property versus getters and setters – Stack Overflow
Python3 Tutorial: Properties vs. getters and setters
2. Built-in Functions — Python 2.7.12 documentation
【总结】
目前看起来的是：
原先对于一个类中的属性，有getter，setter，deleter三个方法，对应实现的写法是：
class C(object): def __init__(self): self._x = None def getx(self): return self._x def setx(self, value): self._x = value def delx(self): del self._x x = property(getx, setx, delx, “I’m the ‘x’ property.”) |
而如果用property的话，默认就是getter：
class Parrot(object): def __init__(self): self._voltage = 100000 @property def voltage(self): “””Get the current voltage.””” return self._voltage |
如果需要，可以再加入setter，deleter：
class C(object): def __init__(self): self._x = None @property def x(self): “””I’m the ‘x’ property.””” return self._x @x.setter def x(self, value): self._x = value @x.deleter def x(self): del self._x |
转载请注明：在路上 » 【基本解决】python中的property