python第三十三天－－－－静态方法、类方法、属性方法-木庄网络博客

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@staticmethod 装饰后，类中的方法转成静态方法

<span style="color: #008080">1</span> <span style="color: #0000ff">class</span><span style="color: #000000"> a:
</span><span style="color: #008080">2</span>     
<span style="color: #008080">3</span> <span style="color: #000000">     @staticmethod
</span><span style="color: #008080">4</span>      <span style="color: #0000ff">def</span><span style="color: #000000"> b(self):
</span><span style="color: #008080">5</span>         <span style="color: #0000ff">print</span>(<span style="color: #800000">''</span>)

静态方法不可以访问实例变量或类变量，相当于类中的工具包。如os, system 等 import的模块一般

@classmethod装饰后，类中的方法转成类方法，类方法和普通方法的区别是，类方法只能访问类变量，不能访问实例变量

<span style="color: #008080">1</span> <span style="color: #0000ff">class</span><span style="color: #000000"> b(object)：
</span><span style="color: #008080">2</span>     name=<span style="color: #800000">'</span><span style="color: #800000">aa</span><span style="color: #800000">'</span>
<span style="color: #008080">3</span> <span style="color: #000000">    @classmethod
</span><span style="color: #008080">4</span>     <span style="color: #0000ff">def</span><span style="color: #000000"> cc(self):
</span><span style="color: #008080">5</span>         <span style="color: #0000ff">print</span>(<span style="color: #800000">'</span><span style="color: #800000">%s .l.....</span><span style="color: #800000">'</span>%<span style="color: #000000">name)
</span><span style="color: #008080">6</span> 
<span style="color: #008080">7</span> 
<span style="color: #008080">8</span> 
<span style="color: #008080">9</span> b.cc()

@property装饰后把,类中的方法方法转成静态属性

静态属性的使用方法

<span style="color: #008080"> 1</span> <span style="color: #0000ff">class</span><span style="color: #000000"> Eat_food(object):
</span><span style="color: #008080"> 2</span>     self.<span style="color: #800080">__food</span>=None<span style="color: #008000">#</span><span style="color: #008000">设置一个私有属性</span>
<span style="color: #008080"> 3</span>     
<span style="color: #008080"> 4</span> <span style="color: #000000">    @property
</span><span style="color: #008080"> 5</span>     <span style="color: #0000ff">def</span><span style="color: #000000"> eat(self):
</span><span style="color: #008080"> 6</span>         <span style="color: #0000ff">print</span>(<span style="color: #800000">'</span><span style="color: #800000">.....%s</span><span style="color: #800000">'</span>%self.<span style="color: #800080">__food</span><span style="color: #000000">)
</span><span style="color: #008080"> 7</span>     
<span style="color: #008080"> 8</span>     @eat.setter  <span style="color: #008000">#</span><span style="color: #008000">再次装饰后可以对其赋值</span>
<span style="color: #008080"> 9</span>     <span style="color: #0000ff">def</span><span style="color: #000000"> eat(self,food):
</span><span style="color: #008080">10</span>         <span style="color: #0000ff">print</span>(<span style="color: #800000">'</span><span style="color: #800000">.....%s</span><span style="color: #800000">'</span>%<span style="color: #000000">food)
</span><span style="color: #008080">11</span>         self.<span style="color: #800080">__food</span>=food<span style="color: #008000">#</span><span style="color: #008000">保存到私有属性，备用</span>
<span style="color: #008080">12</span>     
<span style="color: #008080">13</span> <span style="color: #000000">    @eat.deleter
</span><span style="color: #008080">14</span>     <span style="color: #0000ff">def</span><span style="color: #000000"> eat(self):
</span><span style="color: #008080">15</span>         <span style="color: #0000ff">del</span> self.<span style="color: #800080">__food</span><span style="color: #008000">#</span><span style="color: #008000">删除保存赋值的私有属性，相当于删除这个属性方法</span>