title: Set PYTHONPATH in Sublime 3
body: <p>I'm using Sublime editor for writing Python programs, with the Anaconda plugin.</p>
  
  <p>I have a Python project which relies on some custom python lib I wrote in another directory.</p>
  
  <p>I first modified the MyProject.sublime-project file in the build_systems section, it seemed to work but after some time, the sublime-project file is automaticcally overwritten.</p>
  
  <p>I then found that the right way to do it is to add a settings/extra_paths section (from <a href="https://stackoverflow.com/questions/33643793/prevent-sublime-text-from-overwriting-sublime-project">here</a>) and my sublime-project file looks like this :</p>
  
  <pre><code>{
      "build_systems":
      [
          {
              "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
              "name": "Anaconda Python Builder",
              "selector": "source.python",
              "shell_cmd": "\"python\" -u \"$file\""
          }
      ],
      "folders":
      [
          {
              "path": "."
          }
      ],
      "settings": 
      {
          "extra_paths":
          [
              "C:\\path\\to\\my_lib"
          ]
      }
  }
  </code></pre>
  
  <p>But it doesn't work. Not only my libs import aren't found by the Python interpreter, but if I type :</p>
  
  <pre><code>import sys
  print sys.path
  </code></pre>
  
  <p>I can't see my directory listed.</p>
  
  <p>What am I doing wrong ?</p>