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. |
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!
% puts ${ }
ohdear!
%
%
% set 7 34
34
% puts $7
34
%
% set print puts
puts
%
% $print "Hello World"
Hello World
%
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 exampleWorking out distance between places, using OS grid references and a program in TclEverything is a string - even a listTcl variable names - no real limits!Binary data handling - Python and PerlRunning an operating system command from your Python program - the new way with the subprocess moduleDeciding whether to use parameters, conditional statements or subclassesSpike solution, refactoring into encapsulated object methods - good design practiseWhat is the difference between a function and a method?
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