Python: Speed

One of the many things I like about Python is that it is fairly easy to incorporate C++ modules into it in such a way that it appears to be just another Python class. This is useful for those pieces that need to access an external library or if you want to speed up a piece of code.
For a project I did for my wife I wrote part of it in C++ using the boost python library. It's not a bad way to go since you may already need the boost libraries anyway. Another method is using the SWIG library, for a comparison of the two libraries look at this article. My experience was quite positive using the C++ with Python.
Knowing that I have this back door really feels liberating. It also means that a lot of libraries you can get for Python are actually written mostly in C or C++ and not in pure Python.
There are two other methods of speeding up your Python.
The simplest to use is Psyco which claims an average of 4x speedup (2x-100x). It works with unmodified Python code and it's only real drawback is it's consumption of memory. It's basically a type of Just-In-Time compiler.
One step up is Pyrex. Pyrex is Python with C data types, so you have to change your Python code a little bit to support Pyrex and there are a few limitations. What it comes down to, is you can take some existing Python code, add a few declarations and then use a C compiler to compile it to object code. So now you have the benefits of C's speed but get to write it in Python, very cool.

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