title: In vscode using Python, ctrl+F5 always asks for "select environment"
body: <p>I installed VSCode, downloaded official Python 3.6.4.</p>
  
  <p>VSCode detected and set the environment right - I do see "python.pythonPath" user setting set correctly.</p>
  
  <p>But, when using VS Code using <kbd>Ctrl</kbd>+<kbd>F5</kbd>to run a Python file, I am always getting asked for "select environment" and it shows me two options
   - Python
   - Python Experimental</p>
  
  <p>What is this "Python Experimental"? How can I get rid of getting interrupted every time I try to run a script?</p>