title: "jupyter-kernelspec" not found while installing iqsharp however it exists on PATH
body: <p>While installing QDK for use with python as described in <a href="https://docs.microsoft.com/en-us/quantum/install-guide/pyinstall" rel="nofollow noreferrer">this guide</a>, on executing <code>dotnet iqsharp install</code> I get the following exception</p>
  
  <pre><code>Traceback (most recent call last):
    File "c:\users\hp\appdata\local\programs\python\python36\lib\runpy.py", line 193, in _run_module_as_main
      "__main__", mod_spec)
    File "c:\users\hp\appdata\local\programs\python\python36\lib\runpy.py", line 85, in _run_code
      exec(code, run_globals)
    File "C:\Users\hp\AppData\Local\Programs\Python\Python36\Scripts\jupyter.exe\__main__.py", line 7, in &lt;module&gt;
    File "c:\users\hp\appdata\local\programs\python\python36\lib\site-packages\jupyter_core\command.py", line 247, in main
      command = _jupyter_abspath(subcommand)
    File "c:\users\hp\appdata\local\programs\python\python36\lib\site-packages\jupyter_core\command.py", line 134, in _jupyter_abspath
      'Jupyter command `{}` not found.'.format(jupyter_subcommand)
  Exception: Jupyter command `jupyter-kernelspec` not found.
  </code></pre>
  
  <p>However, when I run <code>jupyter-kernelspec</code> command on cmd it is found on PATH. Why is it happening that python is unable to locate a command if cmd can find it?</p>