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    <p>You can reload a module when it has already been imported by using the <a href="https://docs.python.org/2.7/library/functions.html#reload" rel="noreferrer"><code>reload</code></a> builtin function in Python 2:</p> <pre><code>import foo while True: # Do some things. if is_changed(foo): foo = reload(foo) </code></pre> <p>In Python 3, <code>reload</code> was moved to the <a href="https://docs.python.org/3.2/library/imp.html" rel="noreferrer"><code>imp</code></a> module. In 3.4, <code>imp</code> was deprecated in favor of <a href="https://docs.python.org/3.4/library/importlib.html" rel="noreferrer"><code>importlib</code></a>, and <a href="https://docs.python.org/3.4/library/importlib.html#importlib.reload" rel="noreferrer"><code>reload</code></a> was added to the latter. When targeting 3 or later, either reference the appropriate module when calling <code>reload</code> or import it.</p> <p>I think that this is what you want. Web servers like Django's development server use this so that you can see the effects of your code changes without restarting the server process itself.</p> <p>To quote from the docs:</p> <blockquote> <p>Python modules’ code is recompiled and the module-level code reexecuted, defining a new set of objects which are bound to names in the module’s dictionary. The init function of extension modules is not called a second time. As with all other objects in Python the old objects are only reclaimed after their reference counts drop to zero. The names in the module namespace are updated to point to any new or changed objects. Other references to the old objects (such as names external to the module) are not rebound to refer to the new objects and must be updated in each namespace where they occur if that is desired.</p> </blockquote> <p>As you noted in your question, you'll have to reconstruct <code>Foo</code> objects if the <code>Foo</code> class resides in the <code>foo</code> module.</p>
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    1. POHow do I unload (reload) a Python module?
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    1. COactually, the django dev server restarts itself when you change a file .. (it restarts the server, not just reloads the module)
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    2. COAh, you're right -- looks like they just reboot the server thread. Well, just know that they *could* use reload, I guess. :-)
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    3. COwhere is this "is_changed" function coming from? i see no documentation on it and it doesn't run in my Python 3.1.3 environment, nor does it run in 2.6.4.
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