some nice blog posts about SymPy
Ondrej Certik
I used blogsearch.google.com with the word SymPy and found quite a lot
of blog posts, so I put links to them here:
http://docs.sympy.org/outreach.html#blogs-news-magazines
Some examples:
http://stochastix.wordpress.com/2008/07/05/playing-with-sympy/
"It's precisely the kind of CAS I was looking for: simple,
lightweight, open-source, free, easy to use, and syntactically
tasteful. It just makes sense. Simplicity über alles.
...
Finally, I came across SymPy and it was a beautiful moment. After much
frustration, it seemed that I had found the right CAS for me.
...
I am an engineer, not a mathematician. I don't need to use symbolic
computation that often, so I don't feel like buying a commercial CAS
to use it only twice a year. Moreover, I don't need to use very
sophisticated symbolic manipulation. I need something simple that
"just works". Last but not least, I like to take a look at the source
code, so no closed-source CAS'es for me, please.
Given all that, SymPy seems to be the perfect match. A marriage made
in heaven. I am walking on air. Figuratively speaking, of course.
"
http://www.metarz.net/blog/?p=92
Where the author uses SymPy to calculate the Feynman path integral
from the Zee book. That's a very cool example!
Ondrej