RT。最好附上实例或伪代码,方便大家交流哈!
来自Quora的相同问题:Python (programming language): What are the Python features you wish you'd known earlier?
比较符连写:
<span class="o">>>></span> <span class="n">x</span> <span class="o">=</span> <span class="mi">5</span> <span class="o">>>></span> <span class="mi">1</span> <span class="o"><</span> <span class="n">x</span> <span class="o"><</span> <span class="mi">10</span> <span class="bp">True</span> <span class="o">>>></span> <span class="mi">10</span> <span class="o">></span> <span class="n">x</span> <span class="o"><=</span> <span class="mi">9</span> <span class="bp">True</span>Copy after login
- 测试程序执行的时间
x,y=y,x dir()import time class Timer: def __enter__(self): self.start = time.clock() return self def __exit__(self,*args): self.end = time.clock() self.interval = self.end-self.start with Timer() as t: dosomesuch() print t.intervalCopy after login
还有列表解析式 [i*2 for i in range(100)] 让我们大喊三声:
递归+yield 真好用啊
递归+yield 真好用啊
递归+yield 真好用啊
这绝对是解决一些难题的专用利器.我用它来实现自定义的文件夹遍历函数..对比os.walk函数,我可以在遍历时进行任何操作,灵活许多.
我用它实现了嵌套字典的漂亮输出,在未理解递归之前,我不敢想象自己能解决这种问题.上例子:比较喜欢map ,reduce,filter省去了很多废话有没有,还有list comprehension。。。<span class="k">def</span> <span class="nf">superPrint</span><span class="p">(</span><span class="n">inidic</span><span class="o">=</span><span class="p">{},</span><span class="n">indent</span><span class="o">=</span><span class="nb">chr</span><span class="p">(</span><span class="mi">32</span><span class="p">)):</span> <span class="n">length</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">inidic</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span><span class="p">,</span><span class="n">d</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">inidic</span><span class="o">.</span><span class="n">items</span><span class="p">()):</span> <span class="c">#if the k or v is string object,add ' to both sides</span> <span class="n">k</span><span class="p">,</span><span class="n">v</span><span class="o">=</span><span class="p">[</span><span class="s">"'</span><span class="si">%s</span><span class="s">'"</span><span class="o">%</span><span class="n">x</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">x</span><span class="p">,(</span><span class="nb">str</span><span class="p">,</span><span class="nb">unicode</span><span class="p">))</span> <span class="k">else</span> <span class="n">x</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">d</span><span class="p">]</span> <span class="c">#if the v is dict object,recurse across v and return a string</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">v</span><span class="p">,</span><span class="nb">dict</span><span class="p">):</span> <span class="n">v</span><span class="o">=</span><span class="s">''</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">superPrint</span><span class="p">(</span><span class="n">v</span><span class="p">,</span><span class="n">indent</span><span class="o">+</span><span class="nb">chr</span><span class="p">(</span><span class="mi">32</span><span class="p">)</span><span class="o">*</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">k</span><span class="p">))</span><span class="o">+</span><span class="mi">3</span><span class="p">)))</span> <span class="k">if</span> <span class="n">length</span><span class="o">==</span><span class="mi">1</span><span class="p">:</span> <span class="k">yield</span> <span class="s">"{</span><span class="si">%s</span><span class="s">: </span><span class="si">%s</span><span class="s">}"</span><span class="o">%</span><span class="p">(</span><span class="n">k</span><span class="p">,</span><span class="n">v</span><span class="p">)</span> <span class="k">elif</span> <span class="n">i</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span> <span class="k">yield</span> <span class="s">"{</span><span class="si">%s</span><span class="s">: </span><span class="si">%s</span><span class="s">,</span><span class="se">\n</span><span class="s">"</span><span class="o">%</span><span class="p">(</span><span class="n">k</span><span class="p">,</span><span class="n">v</span><span class="p">)</span> <span class="k">elif</span> <span class="n">i</span><span class="o">==</span><span class="n">length</span><span class="o">-</span><span class="mi">1</span><span class="p">:</span> <span class="k">yield</span> <span class="s">"</span><span class="si">%s%s</span><span class="s">: </span><span class="si">%s</span><span class="s">}"</span><span class="o">%</span><span class="p">(</span><span class="n">indent</span><span class="p">,</span><span class="n">k</span><span class="p">,</span><span class="n">v</span><span class="p">)</span> <span class="k">else</span><span class="p">:</span> <span class="k">yield</span> <span class="s">"</span><span class="si">%s%s</span><span class="s">: </span><span class="si">%s</span><span class="s">,</span><span class="se">\n</span><span class="s">"</span><span class="o">%</span><span class="p">(</span><span class="n">indent</span><span class="p">,</span><span class="n">k</span><span class="p">,</span><span class="n">v</span><span class="p">)</span>Copy after login
还有高阶函数,闭包。。
另外么,getattr ,hasattr函数吧。。。
with as 结构
in关键字 也很省事。。
其实这些特性别的语言也有,但是第一次见是在python中。。 python 的元组 、序列 、字典 数据结构及其容易操作,切片很实用。
还有Python有很多友好方便的语法糖。果断是缩进。。<span class="n">help</span><span class="p">(</span><span class="n">something</span><span class="p">)</span>Copy after loginRelated labels:Statement of this WebsiteThe content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cnLatest Articles by Author
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