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Training, Open Source Programming Languages |
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| This is now an archive web site. Some is still relevant as at February 2026 but some is purely of historic interest. Lisa and I (Graham) are now fully retired from IT training.We have made many friends over 30 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Apache, Linux and Solaris/SunOS too. Our training notes are out of date, but with upward compatability some examples remain operational and relevant. You are welcome to make use of them "as seen", at your own risk. We now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We remain active, enjoying the times that we are retired but still healthy enough in mind and body to do things! I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
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Tcl variable names - no real limits! (written 2015-03-10)
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!Remember that in Tcl, you put s $ in front of a varioable name if you're just using the existing content, and no $ if you;re setting (or in a syntax where it will possibly be set) (written 2015-03-10, updated 2015-03-11) Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles T202 - Tcl/Tk - Tcl Fundamentals[3] Looking for a donkey - (2004-08-05) [210] Joining lists in Tcl. Indirect variables in Tcl. - (2005-02-12) [328] Making programs easy for any user to start - (2005-05-29) [349] Comments in Tcl - (2005-06-16) [362] The ireallyreallywanna operator - (2005-06-28) [782] Converting between Hex and Decimal in Tcl - (2006-06-28) [1136] Buffering output - why it is done and issues raised in Tcl, Perl, Python and PHP - (2007-04-06) [1282] Stringing together Tcl scripts - (2007-07-29) [1426] Buffering up in Tcl - the empty coke can comparison - (2007-11-10) [1469] Curley brackets v double quotes - Tcl, Tk, Expect - (2007-12-12) [2442] Variable storage - Perl, Tcl and Python compared - (2009-10-08) [3917] BODMAS - the order a computer evaluates arithmetic expressions - (2012-11-09) [4324] Learning to program - variables and constants - (2014-11-22)
Some other Articles
Test framework for TCL - Tcltest - some examplesObjects in Tcl - iTcl - updated first steps example Working out distance between places, using OS grid references and a program in Tcl Everything is a string - even a list Tcl variable names - no real limits! Binary data handling - Python and Perl Running an operating system command from your Python program - the new way with the subprocess module Deciding whether to use parameters, conditional statements or subclasses Spike solution, refactoring into encapsulated object methods - good design practise What is the difference between a function and a method? |
4759 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per pageThis 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. So much so, and it's so long ago that we are retired
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