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2719 - Traffic lights in Python
A really short demo (I'm short on time ... in Dublin and rushing off to do day No. 2 of a Python course!) A loop - an anonymous list, and a modulo function that lets us cycle round and round the members of that list for k in range(12):   light = ["red","red-an-yellow","green","yellow"][k ....

2718 - Python - access to variables in the outer scope
In Python, variables are local to the block in which they're used unless declares in some other way. And that's good news, because the last thing you want in a substantial script is for data to "leak" between functions as can happen in default-accepting Perl or Lua. But there is an exception ... ....

2717 - The Multiple Inheritance Conundrum, interfaces and mixins
Should an OO programming language support "multiple inheritance"? Let's define multiple inheritance first - starting from simple (single?) inheritance. (Single) Inheritance. I don't want to have to define each type of thing ("class of object") from scratch, so I'll define once class as being base ....

2716 - Melksham in Pictures
I was feeling "out of sorts" yesterday - and the spring weather (and an urgent request for pictures for use by our twin town of Avon) gave me an excellent excuse to talk a walk round, spring clean my picture library, and put together a new slide show of Melksham. You can start the slide show [here] ....

2715 - Uploading an image, document or pdf via a browser (php)
One of the most popular scripts on our web site is a demonstration, with full source code, of how you can upload data from a browser, store it into a MySQL database, pull it back from that database, and display it within a new or future response pages. But there's a lot of steps in that upload - st ....

2714 - A simple example - XML from a Ruby program
The REXML module is supplied with the Ruby distribution and provides a neat way of handling XML data in Ruby. There is a very wide range of methods available, though, and sometimes it's hard to see the wood for the trees. So here - to start - is the [full source] of an application which reads an ....

2713 - History is all around us
Some images from the last few days - all taken close to home in Melksham (some very close indeed!) ... Woolmore House at Bowerhill on the Melksham to Devizes Road was built by George Hulbert in 1631. It is believed to have been built to a plan of Inigo Jones. [source]. Also [here]. Erected in 1838 ....

2712 - A more informed decision than ever before
They're off! Gordon Brown fired the starting gun the other day - and I was most impressed that by the time that I came out of Well House Manor that evening, there were Orange posters up across the road. I feel more involved - much more involved - in this general election. For I know, (and rather m ....

2711 - For loop - checked once, or evety time? Ruby v Perl comparison and contrast
Although may aspects of Ruby are inherited (in a non-OO way!) from Perl, there are some distinct differences too; a classic for loop in Perl has its end condition checked every time around the loop, but a Ruby for loop sets up an iterator at the start, so that if something changes within the loop ev ....

2710 - __index and __newindex in Lua - metatable methods
When you call up an element in a table in Lua, it's like accessing an array element - and it works well. But you can go further by associating a metatable with a table - that's another table with a whole lot of extras - and that allows you to alter the behaviour of the original table. Since Lua ....

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This page is from the web site of Well House Consultants who provide Open Source computer training. Program written / developed as a demonstration during a PHP course. The example is in module H113

Training sample © 2024, WELL HOUSE CONSULTANTS LTD
This is http://www.wellho.net/demo/mqclim.php
See source code here • More examples - same topic here
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