title: python subprocess set shell var. and then run command - how?
body: <p>I need to do this:</p>
  
  <pre><code>$ export PYRO_HMAC_KEY=123
  $ python -m Pyro4.naming
  </code></pre>
  
  <p>So, i found that the second one is possible to do with </p>
  
  <pre><code>subprocess.Popen(['python','-m','Pyro4.naming'])
  </code></pre>
  
  <p>but how export shell variable before that?</p>