Question: each unit test I'm running is writing python code out to a file, then importing it as a module. The problem is that the code changes but further import statements don't modify the module.

I think what I need is a way to ether force a reload on a module or clear the internal bytecode cache. Any ideas?

Thanks!

Answer: 
Reimporting modules is tricky to get all the edge cases right. The documentation for [reload](http://docs.python.org/library/functions.html#reload) mentions some of them. Depending on what you are testing, you *may* be better off by testing the imports with separate invocations of the interpreter by running each via, say, [subprocess](http://docs.python.org/library/subprocess.html). It will likely be slower but also likely safer and more accurate testing.
Ran into a similar situation.
Later on found that the white space indentation technique used matters.
Especially on windows platforms, ensure that a uniform technique is adapted 
throughout the module i.e., either use tab or spaces exclusively.