title: How can I update pip in PyCharm when I have two versions of python?
body: <p>I have installed Python 2.7 and Python 3.5 on Windows 10. I use python 2.7 in my current PyCharm project and the project's python interpreter was set to python 2.7. Now I open PyCharm Settings and I want to update my pip of python 2.7.</p>
  
  <p><a href="https://i.stack.imgur.com/lftvZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/lftvZ.png" alt="enter image description here"></a></p>
  
  <p>The pip version was 8.1.1 and I clicked update, expecting it to be updated to the latest version. However, after it hinted "update successfully", I noticed that the version of pip was still 8.1.1. Then I realized that PyCharm may use my default pip version in Windows command line--which is the python3.5's pip.</p>
  
  <p>How to solve this problem? Is it a bug? </p>