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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 and matplotlib, 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 articles
Y118 - Python - numpy, scipy and matplotlib
  [4440] A first graph with Matplotlib in Python - (2015-02-22)
  [3554] Learning more about our web site - and learning how to learn about yours - (2011-12-17)
  [2997] 3D graphics - web site usage - simple matplotlib and python example - (2010-10-12)
  [2993] Arrays v Lists - what is the difference, why use one or the other - (2010-10-10)
  [2992] Matplotlib - graphing in Python - teaching examples - (2010-10-10)
  [2991] Loading and saving data - Python / numpy - (2010-10-09)
  [2990] What are numpy and scipy? - (2010-10-09)

Y113 - Python and SQL databases
  [4537] example of SQLite using a local database file through SQLalchemy - (2015-10-14)
  [4535] SQLAlchemy - first examples with a Python Object Relationship Mapping system - (2015-10-14)
  [4436] Accessing a MySQL database from Python with mysql.connector - (2015-02-21)
  [4086] Cacheing class for Python - using a local SQLite database as a key/value store - (2013-05-14)
  [4024] SQL databases from Python - an SQLite example - (2013-03-02)
  [3139] Steering our Python courses towards wxPython, SQLite and Django - (2011-01-19)
  [3136] A framework with python - Django - first steps - (2011-01-17)
  [2790] Joining a MySQL table from within a Python program - (2010-06-02)
  [2786] Factory methods and SqLite in use in a Python teaching example - (2010-05-29)
  [2746] Model - View - Controller demo, Sqlite - Python 3 - Qt4 - (2010-04-29)
  [2745] Connecting Python to sqlite and MySQL databases - (2010-04-28)


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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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