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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.
Selecting elements from an array - glob matching to keys
Arrays and dicts example from a Well House Consultants training course
More on Arrays and dicts [link]
Source code: arr_log_2 Module: T208
#!/usr/bin/env tcl
# Read and analyse an access log file
set fhandle [open seal_log r]
while {[set line [gets $fhandle]] >0} {
        set hitlist [split $line]
        set hostname [lindex $hitlist 0]
        set statuscode [lindex $hitlist [expr [llength $hitlist]-2]]
        set accesskey "$hostname/$statuscode"
         if {[info exists counter($accesskey)]} {
                incr counter($accesskey)
        } else {
                set counter($accesskey) 1
        }
}
foreach host [array names counter *4??] {
        puts "$host accessed us $counter($host) times"
        }
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Tcl
 * Tcl Programming
 * Tcl Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Tcl, Tk and Expect are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Arrays and dicts" training module. You'll find a description of the topic and some other closely related examples on the "Arrays and dicts" module index page.

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