title: VS2015.3/PTVS Python Tools no longer working?
body: <p><strong>strong text</strong>I reinstalled <strong>VS 2015 Update 3</strong> (from Web install) w/Python Tools, but Python Tools don't seem to work anymore. From ActivityLog.xml, the error is:</p>
  
  <pre><code>&lt;record&gt;494&lt;/record&gt;
  &lt;time&gt;2016/07/04 15:59:16.031&lt;/time&gt;
  &lt;type&gt;Error&lt;/type&gt;
  &lt;source&gt;VisualStudio&lt;/source&gt;
  &lt;description&gt;LegacySitePackage failed for package [Python Tools
               Package]Source:
  &amp;apos;Microsoft.VisualStudio.Composition&amp;apos; 
  Description: Expected 1 export(s) with contract name
  &amp;quot;Microsoft.PythonTools.Interpreter.IInterpreterOptionsService&amp;quot;
  but found 0 after applying applicable constraints.
  #x000D;&amp;#x000A;
  Microsoft.VisualStudio.Composition.CompositionFailedException: 
  Expected 1 export(s) with contract name 
  &amp;quot;Microsoft.PythonTools.Interpreter.IInterpreterOptionsService&amp;quot; 
  but found 0 after applying applicable constraints.&amp;#x000D;&amp;#x000A;   
  Microsoft.VisualStudio.Composition.ExportProvider.GetExports
  (ImportDefinition importDefinition)&amp;#x000D;&amp;#x000A;   at 
  Microsoft.VisualStudio.Composition.ExportProvider.GetExports
  [T,TMetadataView](String contractName, ImportCardinality 
  cardinality)&amp;#x000D;&amp;#x000A;   at    
  Microsoft.VisualStudio.Composition.ExportProvider.GetExport
  [T,TMetadataView]       (String contractName)&amp;#x000D;&amp;#x000A;   at
  Microsoft.VisualStudio.Composition.ExportProvider.GetExport[T]
  (String   contractName)&amp;#x000D;&amp;#x000A;   at    
  Microsoft.VisualStudio.Composition.ExportProvider.GetExport[T]
  ()&amp;#x000D;&amp;#x000A;   at   
  Microsoft.VisualStudio.Composition.ExportProvider.GetExportedValue
  [T]  ()&amp;#x000D;&amp;#x000A;   at 
  Microsoft.VisualStudio.ComponentModelHost.ComponentModel.GetService
  [T]  ()&amp;#x000D;&amp;#x000A;   at
  Microsoft.PythonTools.PythonToolsService..ctor(IServiceContainer
  container)&amp;#x000D;&amp;#x000A;   at   
  Microsoft.PythonTools.PythonToolsPackage.Initialize()&amp;#x000D;&amp;#x000A;
  at  
  Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.Shell.
  Interop.IVs    Package.SetSite(IServiceProvider sp)&lt;/description&gt;
  &lt;guid&gt;{6DBD7C1E-1F1B-496D-AC7C-C55DAE66C783}&lt;/guid&gt;
  &lt;hr&gt;80131500&lt;/hr&gt; &lt;errorinfo&gt;&lt;/errorinfo&gt;
  </code></pre>
  
  <p>I de-installed/re-installed VS 2015 Python support (directly from PTVS 2.2.4 VS 2015.msi). Same error.</p>
  
  <hr>
  
  <p>What to do? The Machine (Win 10) has Python 2.7/x64 in PATH.</p>
  
  <p><strong>There seems to be a real problem for other too</strong>. See here:
  <a href="https://stackoverflow.com/q/37721461/170194">Visual Studio Python Environments window does not display</a></p>
  
  <p>Interestingly, I have two similar dev machines (Win10/x64), both installed recently, both have VS 2013Pro + VS2015 Community installed. <strong>On one box, everything works fine</strong>, on the other: see above.</p>