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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
3D graphics - web site usage - simple matplotlib and python example

Some very interesting graphs from our server log data, courtesy of Python, numpy and matplotlib. Truly, a picture paints a thousand words. The data in the first and last diagrams is raw - showing exact number of hits per hour; in other diagrams I have used proximity smoothing which makes the trends very much easier to spot amongst lessened noise, but eliminates a peak late in the evening of day 10 which I am going away to investigate when I have posted ;-)

The source code of this example is [here] - the data is unpublished, as it comprises some 24 files of between 20mb and 44 Mb each - an illustration of how powerful a Python tool can be.

Update ... added the next morning I've looked at that late evening spike on 28th September, and it turned out to be some bloke (or blokes) from Almere in Netherlands who looked at just under 20 pages on our site and decided we were so good he would mirror the rest. An automated program, but one claiming to be IE5, was used. He did check robots.txt - but he went for as many pages as he could as fast as he could and caused the spike which caused a noticeable blip on the graphic, with 4416 requests between 10 and 11 pm when the site would otherwise have been quite quiet. The shape of the spike is further explained by 2419 requests in the following hour.

I doubt whether this user would have caused a problem to others even if he had gone "full tilt" as he would probably have been limited by his bandwidth, but it was a good test of our "governor value" which duely kicked into action.
(written 2010-10-12, updated 2010-10-13)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y118 - Python - numpy, scipy and matplotlib
  [2990] What are numpy and scipy? - (2010-10-09)
  [2991] Loading and saving data - Python / numpy - (2010-10-09)
  [2992] Matplotlib - graphing in Python - teaching examples - (2010-10-10)
  [2993] Arrays v Lists - what is the difference, why use one or the other - (2010-10-10)
  [3554] Learning more about our web site - and learning how to learn about yours - (2011-12-17)
  [4440] A first graph with Matplotlib in Python - (2015-02-22)
  [4445] Graphing presentations in Python - huge data, numpy and matplotlib - (2015-02-28)

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Using an exception to initialise a static variable in a Python function / method
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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