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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.
Loading packages in your Tcl program

In Tcl, extra bundles of code can be loaded from packages which are files of more ... brought in with package require from a folder that's listed in the auto_path variable.

Packages are defined with a package provide in the source code of the package which must be indexed in a file called pkgIndex.tcl. Failure to index will result in Tcl failing to find the package. There's a built in Tcl command called pkg_mkIndex which allows you to generate the index automatically.

Namespaces are technically different to packages, but it'c common practise to define a package in a Tcl namespace to avoid any risk of conflicting names of procedures, and to make it clearer for the maintenance programmer later on to know what's loaded from where.

Example of a program that loads packages - [here]. The packages it loads are [here] (without a namespace and [here] for one with a namespace

(written 2015-10-09)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T213 - Tcl/Tk - Libraries, Packages and Namespaces
  [146] example of Tcl namespaces and packages - (2004-12-10)
  [1339] Packages and Namespaces are like Suitcases and Aircraft - (2007-09-09)
  [1529] Tcl - learning how to use namespaces, packages and libraries together - (2008-02-02)
  [2476] Tcl - uplevel to run code at calling level - (2009-10-24)
  [3066] Separating groups of variables into namespaces - (2010-11-24)
  [3417] What is a namespace and why do we need them? - (2011-09-03)
  [3418] Tcl packages, pkg_mkIndex, pkgIndex.tcl -what are they and why use them. - (2011-09-03)


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This 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. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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