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    <p>Your biggest problem is the one mentioned by sotapme. If you don't actually run <code>app.py</code> as your top-level script, you don't have any code calling <code>app.main()</code>, and therefore nothing initializing the global.</p> <p>Beyond that, "how to reference the instance from another module" is very easy, if you know one simple thing:</p> <p>In Python, globals are namespaced.</p> <p>To put it more concretely, in your other modules, just <code>import app</code>, then access the global as <code>app.myapp</code>.</p> <p>Using the <code>__name__ == '__main__'</code> trick, as sotapme explained, means that you can <code>import app</code> as many times as you want without it running the <code>main()</code> function every time.</p> <p>In particular, when you run this:</p> <pre><code>python app.py </code></pre> <p>The Python interpreter will load <code>app.py</code> with its <code>__name__</code> set to <code>'__main__'</code>, so the <code>if</code> statement will trigger, which will cause the (module-level) global variable <code>myapp</code> to get set to <code>App({})</code>.</p> <p>Now, when <code>resource.py</code> does an <code>import app</code>, its <code>__name__</code> will be set to <code>app</code>, so the <code>if</code> statement will <em>not</em> trigger, so you will construct a new <code>App</code> and replace the global. From the code in <code>resource.py</code>, you can use <code>app.myapp</code>, and you will be accessing the same object that code in <code>app.py</code> sees as <code>myapp</code>.</p> <hr> <p>You also ask for help to pass config to the <code>App</code> constructor. I'm not sure what your problem is here. You're passing an empty <code>dict</code> as a config. If you have a different <code>dict</code> to pass, just use it. Instead of this:</p> <pre><code>myapp = App({}) # Could use help here, how to pass config to it </code></pre> <p>do this:</p> <pre><code>myapp = App(configdict) </code></pre> <p>If your problem is knowing how to get that <code>configdict</code>, that depends on where the information comes from.</p> <p>If you're trying to parse a user-editable config file, the <a href="http://docs.python.org/2/library/configparser.html" rel="nofollow"><code>configparser</code></a> module works fine for traditional .ini-style files, and the docs have links that explain how to handle some other popular formats.</p> <p>If you're trying to build up config information from a command line, see <a href="http://docs.python.org/2/library/argparse.html" rel="nofollow"><code>argparse</code></a>.</p> <p>If you want to allow environment variables to interact with either of the above (e.g., a <code>MYAPP_CONFIG</code> might tell your <code>configparser</code> code to load a different config file than normal, or a <code>MYAPP_CACHE_DIR</code> might provide a different default for the <code>--cachedir</code> command-line argument for <code>argparse</code>), you get the values in <a href="http://docs.python.org/2/library/os.html#os.environ" rel="nofollow"><code>os.environ</code></a>, but have to write your own code to do anything with them.</p>
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    1. POHow to initialize a python object once and share across other modules?
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