title: python anaconda - manage module for different python versions
body: <p>I have 2 version of <code>Python</code> in my mac(2.7 and 3.5.1) in my Anaconda. When every I </p>
  
  <pre><code>pip install xxx
  </code></pre>
  
  <p>it will automatically go into <code>/anaconda/lib/python2.7/site-packages</code> folder. 
  Now I want to learn <code>aiohttp</code> and when I install it</p>
  
  <pre><code>pip install aiohttp
  </code></pre>
  
  <p>it will give me error:</p>
  
  <blockquote>
    <p>raise RuntimeError("aiohttp requires Python 3.4.1+")
        RuntimeError: aiohttp requires Python 3.4.1+</p>
  
  <pre><code>---------------------------------------- Command "python setup.py egg_info" failed with error code 1 in
  </code></pre>
    
    <p>/private/var/folders/c2/3yxfnvc51fng531jz312t00m0000gn/T/pip-build-m_mCpM/aiohttp/</p>
  </blockquote>
  
  <ol>
  <li>How can I resolve this?</li>
  <li>What is the best way to manage the 2 versions of <code>Python</code> in <code>Anaconda</code>?</li>
  </ol>