title: python3.5.i cant install third-party libraries for python by using instructions " python setup.py install"
body: <p>When I tried to install third-party libraries for python3.5,something is wrong like that</p>
  
  <pre><code>E:\IE\pycocotools-2.0.0&gt;python setup.py build
  running build
  running build_py
  running build_ext
  error: [WinError 2] The system cannot find the file specified
  </code></pre>
  
  <p>the <code>setup.py</code> is from:<a href="https://github.com/philferriere/cocoapi" rel="nofollow noreferrer">https://github.com/philferriere/cocoapi</a> 
  and i want to install cocoAPI to use coco dataSets.</p>
  
  <p>addtions:1 .i had installed vs2017(vc++ environment) in my computer</p>