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copied!<p>Ah! Tricky, but I got it!</p> <p>"foo" is not a simple "other package" - it is seem by Python as a sub-module of your "package" module.</p> <p>When you first run "package" - either importing it from an external script, or by running it with the <code>-m</code> command line switch (but not if you run <code>python package/__init__.py</code> directly from the command line), the "package" module is parsed, and added to the <code>sys.modules</code> dicticionary (on the <code>sys</code> module). </p> <p>When the sub-module <code>foo</code> is read, besides being placed directly under <code>sys.modules</code> under the key <code>["package.foo"]</code>, it is also set as an attribute to its parent module. Therefore it would be avaliable in your Python app as <code>package.foo</code>. What happens is that setting an attribute in <code>sys.modules["package"]</code>, has the same effect than setting a key in <code>package/__init__.py</code> globals in runtime. That is what is happening.</p> <p>I hope I could translate the process into words properly - if not, just ask again by commenting. </p> <p>-- Since this is probably happening in real code you have, and the equivalent of "do_import" is being called from code outside your package (and have the side effects of making your sub-modules appear on the package's global namespace), there is no easy work around on the way you are doing it. My suggestion is to just add an underscore (<code>_</code>) at the beggining of the sub-modules names if they are not intended to be called from general code from outside your package. (It also won't show up if someone does <code>from package import *</code> in this case)</p>

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