[Edu-sig] Introducing Python to Engineering Students
macquigg at ece.arizona.edu
Wed Mar 12 01:11:45 CET 2008
At 03:12 PM 3/11/2008 -0700, Rob Malouf wrote:
>On Mar 11, 2008, at 2:57 PM, David MacQuigg wrote:
>> I guess what I should conclude is that when performance is
>>important, don't bother trying to optimize Python. Go straight to
>>C, and get 10 or 100X improvement.
>That hasn't always been my experience. I found that using psyco and
>numpy (along with careful profiling and optimization), I can often get
>essentially the same performance from pure Python that I can get from
>mixed Python/C solutions, and with much less trouble.
I agree that the Python/C interface is more trouble than it should be, especially for freshman engineering students and technical professionals who don't have time for messy programming details. What I would like to see is something like a simple "directive" I could put in my Python code to say "The following function is in C", and have Python set up the linkage for me.
It would make a nice improvement in this Mandelbrot demo if you could show me a way to significantly improve the speed of the Python I already have, perhaps avoiding the need for C. I've posted the complete Python module at
Just run the command
$ python mandel.py
and you should see the output from two examples in the doctests:
1a) Python speed = 787 points/sec
1b) C speed = 125500 points/sec
2a) Python speed = 823 points/sec
2b) C speed = 134300 points/sec
The C source, mandelbrotC.c, is also in that same directory. The tests above were done on an old Windows machine running Cygwin.
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