title: subprocess.Popen - No such file or directory
body: <p>Code:</p>
  
  <pre><code>import subprocess
  
  process = subprocess.Popen('echo 5')
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "test.py", line 3, in &lt;module&gt;
      process = subprocess.Popen('echo 5')
    File "/usr/lib64/python2.6/subprocess.py", line 642, in __init__
      errread, errwrite)
    File "/usr/lib64/python2.6/subprocess.py", line 1238, in _execute_child
      raise child_exception
  OSError: [Errno 2] No such file or directory
  </code></pre>
  
  <p>Can someone please advise what is the issue with the above code?</p>