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    <p>In <code>python.el</code>, a new inferior process is launched in a new buffer if the <code>python-buffer</code> variable is set to <code>nil</code>. Therefore, it's possible to advise the <code>python-send-buffer</code> function to reset that variable to <code>nil</code> after every invocation, thereby forcing a new Python process to be executed for every subsequent <code>python-send-buffer</code> command. Something like the following should work:</p> <pre><code>(defadvice python-send-buffer (after python-send-buffer-new-proc activate) (setq python-buffer nil)) (ad-activate python-send-buffer) </code></pre> <p>I know that your post was asking for help with <code>python-mode.el</code>, but I thought it might be helpful to mention this anyway, as I'd surprised if <code>python-mode.el</code> doesn't use a similar mechanism. If I have time, I'll try to look into it.</p> <p>Edit: the <code>python-mode.el</code> package uses the command <code>py-shell</code> to initiate a new inferior Python process. I found <a href="http://mail.scipy.org/pipermail/ipython-user/2007-May/004365.html" rel="nofollow">a mailing list posting</a> in which a user provides an <em>ad hoc</em> function that appears to do what you need.</p> <p>By the way, it might be worth considering that trying to alter the default behavior of <code>python-mode</code> isn't the best approach to this problem. I don't know what your code does, and I'm not particularly familiar with Twisted, but it seems to me that experiencing major errors when evaluating your code a second time within the same session could be a sign of a more fundamental design problem. I fail to see how it could be a matter of multiple <code>imports</code> of the same module being the issue, as Python modules are only loaded once, with successive <code>import</code> statements having no effect (for that, an explicit <code>reload</code> or <code>execfile()</code> is required). If I'm completely off-base here, I apologize, but I felt this possibility might merit mention.</p>
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    1. COThanks, that helped a lot. To the Twisted problem: I do an `from twisted.internet import gtk3reactor gtk3reactor.install()` as per Twisted manual which causes the problem when being evaluated a second time. Is there a standard way of checking whether a module has been imported before?
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    2. CO@gnirx, normally, importing a module a second time has no effect, and if it does have some effect, particularly an error-producing one, it's probably an indication that the code should be restructured in some way. That said, maybe your case is an exception -- I don't know enough about the particulars of Twisted to be certain either way. If you really want to check whether a module has been imported, `import sys` and check whether it's present in `sys.modules`. Keep in mind, that's generally considered kludgy, and it'd be better to avoid if possible.
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