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4213 - Formatting options in Python
Take a look at this program run:   munchkin:n13py grahamellis$ python twoforms      There is a large piece of timber in the back garden   and the dog was sniffing around it earlier. It looks like it was left   there by the storm that came our way l ....

4212 - Python functions - an introduction to how they work
When I'm writing code, I'll sometimes come to a complicated algorithm and wonder just to to tackle it. I know my inputs and outputs well, but how I calculate it requires considerable thought. Take, for example, a postal delivery service in a traditional English street where the practical thing is to ....

4211 - Handling JSON in Python (and a csv, marshall and pickle comparison)
JSON - JavaScript Object Notation - has become the data encoding standard of choice for many applications far removed from the "Javascript" of its name. It's a compact, readable format which allows collections within a language (that would be lists and dicts in Python, for example) to be encoded int ....

4210 - If elif elif elif - multiway selection in Python
Most languages have "if / else if / else if / else " type constructs for selecting conditional code, although the format / keyword varies between languages, in the case if Python, the intermediate keyword is elif. In all cases with this construct, you can think of it as like peeling an onion - tak ....

4209 - Lists in Tcl - fundamentals in a commented source code example
When I'm writing code demonstrations during class, they usually start off tidy and then get a bit scruffy as I add things in to answer delegate questions. For once last week, a Tcl list demonstration didn't get too untidy, so I give it you here with comments about what each few lines does.   ....

4208 - Tcl + Tk (Wish) - an introduction and revision example
Whenever I teach Tcl with Tk, I'm delighted to be reminded how easy it is to put together a graphic user interface (GUI) with Tcl. They may not be the world's prettiest, but they're quick, straightforward and functional. And so it was on the final day of our Tcl Programming course last week, when I ....

4207 - Exception handling in Tcl
Exceptions are a wonderful fail safe way of trapping errors in most modern programming languages. Although the natural way for a newcomer to programming to handle unusual situations is to test for each possible situation, that becomes a guessing game trying to work out everything that may happen, an ....

4206 - Writing the perfect program in Tcl?
I'm going to disappoint you... there's no such thing as the perfect program. But when I'm writing an answer to a class exercise and showing a sample, I have to make sure it's to a high standard - and that means at least: • Well commented • Using good variable names • Avoiding repetiti ....

4205 - Regular Expression Substitution - Tcl
regexp matches regular expressions in TCL, and it will return the latest match into a series of variables if you specify their names. regsub matches and replaces... not quite such a common requirement, and perhaps something I haven't blogged about in the past.   set newstory [regsub blue ....

4204 - With the Shpigs and Donkeys
At Happy Donkey Hill... a rare weekend away. Contestants from our "Four in a Bed" experience all met at The Daffodil last night   And this morning we went around to see the other animals - more than just donkeys         Off for Sunday lunch in a few minutes ....

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