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    <p><em>Why this code doesn't work is explained in another answer, I'm just answering his questions for the next time something like this happens.</em></p> <blockquote> <p>Would like advice on how to debug why this is not working.</p> </blockquote> <pre class="lang-py prettyprint-override"><code>def create_conf(sender, **kwargs): import pdb pdb.set_trace() os.system("/usr/local/build " + self.site + ' ' + self.num + ' ' + self.octet) </code></pre> <p>This will give you the built-in Python debugger, in the console runserver is running. With it, you can go trough your code step by step, and execute regular Python commands (like print).</p> <p>Read up on the commands for inside the debugger <a href="http://docs.python.org/2/library/pdb.html#debugger-commands" rel="nofollow">here</a> Some IDEs come with Python debugging support, and present it with a nice GUI.</p> <p>When using it a lot: use the oneliner:</p> <pre class="lang-py prettyprint-override"><code>import pdb; pdb.set_trace; # yes, Python supports semicolons # (although its not recommended) </code></pre> <hr> <blockquote> <p>And to make sure that the strings are being passed through from django web page to arguments on cmd application.</p> </blockquote> <p>You can either:</p> <p>cast them to strings to make sure</p> <pre class="lang-py prettyprint-override"><code>os.system("/usr/local/build " + str(self.site) + ' ' + str(self.num) + ' ' + str(self.octet)) </code></pre> <p>or use the string formatter (which is better than using the + sign and makes sure input gets cast to strings)</p> <pre class="lang-py prettyprint-override"><code>os.system("usr/local/build {0} {1} {2}".format(self.site, self.num, self.octet)) </code></pre> <p>Read up on the string .format method <a href="http://docs.python.org/2/library/stdtypes.html#str.format" rel="nofollow">here</a></p>
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