For 2021 - online Python 3 training - see ((here)).
Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.
Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
The case for exceptions
When you run a program, things can go wrong - run time errors. And no amount of coding by the programmer can prevent these things - it [ac] Ä s a user entering a string of text when a number [ac] Ä s required, a needed file having been deleted, or a network connection that [ac] Ä s broken that causes probems.
In traditional coding, it [ac] Ä s standard practise to check for as many of these errors as you can throughout your code, and this often results in a few lines of live code being wrapped in 4 or 5 times that number of lines of error checking ... which catch most but still not all of the errors that may occur.
Exceptions are provided in many modern OO languages - they [ac] Ä re in more recent C++ compilers, for example, as well as in languages like Python and Java. They let you write code where you don [ac] Ä t write the detail of checking for each possible error yourself - rather, you code for the working case and you enclose anything that may go wrong into a try block. Then you provide one or more catch blocks to set up actions that are to be taken if the try block failed to complete.
Great system; often less coding, and with a tendency to fail safe if error conditions that you [ac] Ä ve not explicitly coded for crop up. (written 2006-07-11)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesC236 - C and C based languages - Exceptions 
What are exceptions - Python based answer - (2008-11-08) 
Handling unusual and error conditions - exceptions - (2010-02-03) 
Throwing your own exception in C++, and catching it - (2010-11-24) 
Operator Overloading, Exceptions, Pointers, References and Templates in C++ - new examples from our courses - (2011-11-06)
Some other Articles
Not shoutingundefined reference to typeinfo - C++ error messageSimple polymorphism example - C++Effective web campaign?The case for exceptionsReferences and Pointers in C++Writing up new C / C++ notes.Busy day in MelkshamRemember a site's non-technical issues tooPerl delegate - much more than just a delegate
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