For 2023 - 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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Graphing presentations in Python - huge data, numpy and matplotlib
A picture paints a thousand words. Our server log files for February are 1.6 Gbytes in size, with 5.3 million individual requests. How busy are we at what times of day? I've been looking at this through matplotlib in Python - here's a wireframe of the month - days on the X axis, hour of the day on the Y axis, and height being the accesses per hour:
Rather that extract the data each time we draw a graph, I've written the program in two stages - a data extraction routine that writes our a .json object (source code [here]
) and the graph drawing program [here]
. The plotting program (also used to illustrate Python graphics and numpy on last week's course) produces four different displays - here's another:
Data's available if you wish to run the graph program - [here]
. And if you want to learn about numpy
, let me know before your Python course and we''ll add an extra session on the penultimate evening of your public course, or build it in to your private course. See [here]
. (written 2015-02-28)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesY113 - Python and SQL databases 
Connecting Python to sqlite and MySQL databases - (2010-04-28) 
Model - View - Controller demo, Sqlite - Python 3 - Qt4 - (2010-04-29) 
Factory methods and SqLite in use in a Python teaching example - (2010-05-29) 
Joining a MySQL table from within a Python program - (2010-06-02) 
A framework with python - Django - first steps - (2011-01-17) 
Steering our Python courses towards wxPython, SQLite and Django - (2011-01-19) 
SQL databases from Python - an SQLite example - (2013-03-02) 
Cacheing class for Python - using a local SQLite database as a key/value store - (2013-05-14) 
Accessing a MySQL database from Python with mysql.connector - (2015-02-21) 
SQLAlchemy - first examples with a Python Object Relationship Mapping system - (2015-10-14) 
example of SQLite using a local database file through SQLalchemy - (2015-10-14)Y118 - Python - numpy, scipy and matplotlib 
What are numpy and scipy? - (2010-10-09) 
Loading and saving data - Python / numpy - (2010-10-09) 
Matplotlib - graphing in Python - teaching examples - (2010-10-10) 
Arrays v Lists - what is the difference, why use one or the other - (2010-10-10) 
3D graphics - web site usage - simple matplotlib and python example - (2010-10-12) 
Learning more about our web site - and learning how to learn about yours - (2011-12-17) 
A first graph with Matplotlib in Python - (2015-02-22)
Some other Articles
Spike solution, refactoring into encapsulated object methods - good design practiseWhat is the difference between a function and a method?Overnight accommodation in Melksham - if Well House Manor is full!Combining tests into suites, and suites into bigger suites - Python and unittestGraphing presentations in Python - huge data, numpy and matplotlibElements of an exception in Python - try, except, else, finallySeventh stay away this year - and it's still only February!Mutable v Immuatble objects in Python, and the implicationReading command line parameters in Python
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This is a page archived from The Horse's Mouth at
the diary and writings of Graham Ellis.
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