title: anaconda/conda - install a specific package version
body: <p>I want to install the 'rope' package in my current active environment using conda. Currently, the following 'rope' versions are available:</p>
  
  <pre><code>(data_downloader)user@user-ThinkPad ~/code/data_downloader $ conda search rope
  Using Anaconda Cloud api site https://api.anaconda.org
  Fetching package metadata: ....
  cached-property              1.2.0                    py27_0  defaults        
                               1.2.0                    py34_0  defaults        
                               1.2.0                    py35_0  defaults        
                               1.3.0                    py27_0  defaults        
                               1.3.0                    py34_0  defaults        
                               1.3.0                    py35_0  defaults        
  rope                         0.9.4                    py26_0  defaults        
                               0.9.4                    py27_0  defaults        
                               0.9.4                    py33_0  defaults        
                               0.9.4                    py34_0  defaults        
                               0.9.4                    py26_1  defaults        
                               0.9.4                    py27_1  defaults        
                               0.9.4                    py33_1  defaults        
                               0.9.4                    py34_1  defaults        
                            .  0.9.4                    py35_1  defaults        
  </code></pre>
  
  <p>I would like to install the following one:</p>
  
  <pre><code>                         1.3.0                    py35_0  defaults        
  </code></pre>
  
  <p>I've tried all sorts of permutations of 'conda install' which I'm not going to list here because none of them are correct.</p>
  
  <p>I am also not sure what the <em>py35_0</em> is (I'm assuming this is the version of the python against which the package was built?) and I also don't know what 'defaults' means?</p>