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<h5 class="subsubsection">16.8.7.2 Spawning external processes</h5>

<p>There exist various solutions to spawn external processes from a script:

     <ul>
<li>Use the functionalities provided by the <code>GPS.Process</code> class
<li>Execute a GPS action through <code>GPS.execute_action</code>.

     <p>This action should have an <code>&lt;external&gt;</code> XML node indicating how to
launch the process

     <li>Create a pipe and execute the process with <code>os.popen()</code> calls

     <p>This solution doesn't provide a full interaction with the process, though.

     <li>Use a standard expect library of Python

     <p>The use of an expect library may be a good solution. There are various python
expect libraries that already exist.

     <p>These libraries generally try to copy the parameters of the standard <code>file</code>
class. They may fail doing so, as GPS's consoles do not fully emulate all
the primitive functions of that class (there is no file descriptor for
instance).

     <p>When possible, it is recommended to use one of the methods above instead. 
</ul>

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