我们使用pycharm的时候，经常会因为要链接（import）其他自己写的包，因此在pycharm的时候经常会
报错，就是找不到自己的包，在命令行下常用，export PYTHONPATH=$PYTHONPATH来临时链接。
因此，这里有一个网上的参考，蛮不错的：
来源于：https://stackoverflow.com/questions/17198319/how-to-configure-custom-pythonpath-with-vm-and-pycharm
| | For PyCharm 5 (or 2016.1), you can: - select Preferences > Project Interpreter
- to the right of interpreter selector there is a "..." button, click it
- select "more..."
- pop up a new "Project Interpreters" window
- select the rightest button (named "show paths for the selected interpreter")
- pop up a "Interpreter Paths" window
- click the "+" buttom > select your desired PYTHONPATH directory (the folder which contains python modules) and click OK
- Done! Enjoy it!
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