title: Python/Q#: Module not found error, with .qs file in the same directory
body: <p>Lately I started working with Q# and python as host language. I was working on a project and everything seemed fine. Suddenly I get the error "module not found" and I seem to get it in all my previous projects too.</p>
  
  <p>So I have a directory: C:\Users\Username\Q#projects
  In this folder I have 2 files: HostProtocol.py, which is the main file, and BB84.qs, which is the file from which I want to import.</p>
  
  <p>The HostProtocol.py file looks like this:</p>
  
  <pre><code>import qsharp
  
  from Quantum.BB84 import Run_BB84Protocol
  Run_BB84Protocol.simulate()
  </code></pre>
  
  <p>The BB84.qs file looks like this:</p>
  
  <pre><code>namespace Quantum.BB84 {
      open Microsoft.Quantum.Arrays;
      open Microsoft.Quantum.Measurement;
      open Microsoft.Quantum.Canon;
      open Microsoft.Quantum.Intrinsic;
      open Microsoft.Quantum.Diagnostics;
      open Microsoft.Quantum.Convert;
      open Microsoft.Quantum.Math;
  
  function Run_BB84Protocol() Unit{... the code from the function...}
  }
  </code></pre>
  
  <p>When I try to run HostProtocol.py I get the following error message:</p>
  
  <p>Exception has occurred: ModuleNotFoundError
  No module named 'Quantum'
    File "C:\Users\Username\Q#projects\HostProtocol.py", line 3, in 
      from Quantum.BB84 import Run_BB84Protocol</p>
  
  <p>And this is for all my previous projects too. It's very frustrating and I have no clue what could have caused it because it worked fine previously. Any help is definitely welcome!</p>