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copied!<p>So I revisited this question, and found two solutions (I switched to Python 2.7 sometime ago, so I'm not sure about Python 2.6, but it should be the same.):</p> <ol> <li><p>Replace <strong>find</strong> with <strong>findstr</strong>, and remove doublequotes</p> <pre><code>output = subprocess.Popen(['netstat','-ano','|','findstr',':80'], stdout=subprocess.PIPE, shell=True) .communicate() </code></pre> <p><strong>But this doesn't explain why "find" cannot be used, so:</strong></p></li> <li><p>Use string parameter instead of list</p> <pre><code>output = subprocess.Popen('netstat -ano | find ":80"', stdout=subprocess.PIPE, shell=True) .communicate() </code></pre> <p>or</p> <pre><code>pipeout = subprocess.Popen(['netstat', '-ano'], stdout = subprocess.PIPE) output = subprocess.Popen('find ":80"', stdin = pipeout.stdout, stdout = subprocess.PIPE) .communicate() </code></pre></li> </ol> <p>The problem arise from the fact that: ['find','":80"'] is actually translated into ['find,'\":80\"']. Thus the following command is executed in Windows command shell:</p> <pre><code>>find \":80\" Access denied - \ </code></pre> <p>Proof:</p> <ul> <li><p>Running:</p> <pre><code>output = subprocess.Popen(['echo','find','":80"'], stdout=subprocess.PIPE, shell=True) .communicate() print output[0] </code></pre> <p>returns:</p> <pre><code>find \":80\" </code></pre></li> <li><p>Running:</p> <pre><code>output = subprocess.Popen('echo find ":80"', stdout=subprocess.PIPE, shell=True) .communicate() print output[0] </code></pre> <p>returns:</p> <pre><code>find ":80" </code></pre></li> </ul>

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