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<meta property="og:description" content="单例模式 class Singleton(object): def __new__(cls, *args, **kwargs): if not hasattr(cls, '_insurance'): cls._insurance = super(Singleton, cls).__new__( cls, *args, **kwargs) return cls._insurance if __name__ == '__main__': s1 = Singleton() s2 = Singleton() print(s1) print(s2) 输出结果 <__main__.Singleton object at 0x1019f6320> <__main__.Singleton object at 0x1019f6320> 每个人的输出结果可能不一样，但他们应当相等 …" />
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<meta name="twitter:description" content="单例模式 class Singleton(object): def __new__(cls, *args, **kwargs): if not hasattr(cls, '_insurance'): cls._insurance = super(Singleton, cls).__new__( cls, *args, **kwargs) return cls._insurance if __name__ == '__main__': s1 = Singleton() s2 = Singleton() print(s1) print(s2) 输出结果 <__main__.Singleton object at 0x1019f6320> <__main__.Singleton object at 0x1019f6320> 每个人的输出结果可能不一样，但他们应当相等 …">
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Python 设计模式总结
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<h3>单例模式</h3>
<div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Singleton</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__new__</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="s1">'_insurance'</span><span class="p">):</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">_insurance</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Singleton</span><span class="p">,</span> <span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="fm">__new__</span><span class="p">(</span>
<span class="bp">cls</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">cls</span><span class="o">.</span><span class="n">_insurance</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">'__main__'</span><span class="p">:</span>
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<span class="nb">print</span><span class="p">(</span><span class="n">s2</span><span class="p">)</span>
</pre></div>
<p>输出结果</p>
<div class="highlight"><pre><span></span><__main__.Singleton object at 0x1019f6320>
<__main__.Singleton object at 0x1019f6320>
</pre></div>
<p>每个人的输出结果可能不一样，但他们应当相等</p>
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10, 2016</time>
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