title: Graph-tool installed but can't be imported
body: <p>I installed Graph-tool via homebrew</p>
  
  <pre><code>$ brew --prefix graph-tool
  /usr/local/opt/graph-tool
  </code></pre>
  
  <p>But I still get error when trying to import it.</p>
  
  <p>I have read related posts <a href="https://stackoverflow.com/questions/43521774/how-to-let-python3-import-graph-tool-installed-by-homebrew">How to let python3 import graph-tool installed by Homebrew?</a> and tried all the solutions provided there, but none of them fixed it. Adding the path in python doesn't work, re-run homebrew as below doesn't either.</p>
  
  <pre><code>$ brew install graph-tool --with-python2.7
  Warning: homebrew/science/graph-tool 2.26_1 is already installed
  </code></pre>
  
  <p>I usually use python via anaconda, but I also tried importing it from python console and it didn't work.</p>