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211101
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2008-10-17T04:46:20.680
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2008-10-17T04:46:20.680
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211100
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text
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From the python docs on <code>__import__</code>: <blockquote> <pre><code>__import__( name[, globals[, locals[, fromlist[, level]]]]) </code></pre> ... When the name variable is of the form package.module, normally, the top-level package (the name up till the first dot) is returned, not the module named by name. However, when a non-empty fromlist argument is given, the module named by name is returned. This is done for compatibility with the bytecode generated for the different kinds of import statement; when using "import spam.ham.eggs", the top-level package spam must be placed in the importing namespace, but when using "from spam.ham import eggs", the spam.ham subpackage must be used to find the eggs variable. As a workaround for this behavior, use getattr() to extract the desired components. For example, you could define the following helper: <pre><code>def my_import(name): mod = __import__(name) components = name.split('.') for comp in components[1:]: mod = getattr(mod, comp) return mod </code></pre> </blockquote> To paraphrase: When you ask for <code>somepackage.somemodule</code>, <code>__import__</code> returns <code>somepackage.__init__.py</code>, which is often empty. It will return <code>somemodule</code> if you provide <code>fromlist</code> (a list of the variable names inside <code>somemodule</code> you want, which are not actually returned) You can also, as I did, use the function they suggest. Note: I asked this question fully intending to answer it myself. There was a big bug in my code, and having misdiagnosed it, it took me a long time to figure it out, so I figured I'd help the SO community out and post the gotcha I ran into here.
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1. POPython's __import__ doesn't work as expected
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1. USdwestbrook
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