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4456 - Objects in Tcl - iTcl - updated first steps example
iTcl is Tcl's Object Oriented package, and it's shipped as standard with Tcl these days. On many of our OO courses, we start off with an example of "train" objects and define and run methods such as "getCapacity" on them, and today I've taken that same example and coded it in Tcl - see [here]. My ....

4455 - Working out distance between places, using OS grid references and a program in Tcl
In Great Britain, locations have Ordnance Survey grid reference positions which place them to within 100 metres. Our training centre / hotel is at ST907633 - that's   100 km square ST   90.7 km into that square from the west side   63.3 km into that squate from the so ....

4454 - Everything is a string - even a list
Almost all variables in Tcl are held as strings ... if you use integers and stirings in calculations such as expr and incr. the strings are converted back and forth intergally. Lists, too, are held as strings of characters in which chunks of string are counted / taken out as being elements in the l ....

4453 - Tcl variable names - no real limits!
In Tcl, there are no limits as to what you use as a vaiable name in Tcl, although I would reommend that you stick with "letter, followed by letters, digits, underscores". Here are some examples of thinks you can, but should not, write:   % set " " ohdear!   ohdear!    ....

4452 - Binary data handling - Python and Perl
Handling binary data has become a somewhat rarer requirement over tiem, but that doensn't mean the need has gone away - and on last week's Python course, my delegates had a requirement to read data in this format. First and foremost with binary data, you need to understand what you're looking to re ....

4451 - Running an operating system command from your Python program - the new way with the subprocess module
Python's subprocess module has replaced a series of other modules, and if you're writing new code which calls operating system commands you should use this module in perferance to the older stuff. Easy examples at [here]. The "interesting bit" in various languages is not so much how you cal othe ....

4450 - Deciding whether to use parameters, conditional statements or subclasses
"If you find yourself repeating a piece of code, there must be an easier way" But what if you have a number of similar but not identical items / things / objects? If the things that change between each of your objects are just data values - for example the number and ages of childen - then you can ....

4449 - Spike solution, refactoring into encapsulated object methods - good design practise
Initial test code on new data sets - your research work - will most likely take place in smaller chunks of code while you work out just how the data flows and what you need from it (and you are remembering to read documentation supplied by the data originator, aren't you??). But having done that i ....

4448 - What is the difference between a function and a method?
I strongly encourage delagates on our courses to divide their code into managable, understandable, testable, re-usable chunks rather than write it all into a single block. And the adjectives I've used (managable, understandable, testable, re-usable) explain why. You can process data within these ....

4447 - Overnight accommodation in Melksham - if Well House Manor is full!
We are delighted to welcome overnight guests at Well House Manor, and hope you'll make us your first choice in Melksham. However, we're sometimes fully booked and we cannot offer (for example) family rooms, so you may have to look elsewhere. Here is a list of accommodation that's near to our trai ....

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