Training, Open Source Programming Languages

This is page

Our email: • Phone: 01144 1225 708225

For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) 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 are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Dictionary of objects - exercise and sample answer
Dictionaries example from a Well House Consultants training course
More on Dictionaries [link]

This example is described in the following article(s):
   • Python dictionaries - mutable and immutable keys and values - [link]

Source code: nx Module: Y107

""" Exercise ....

Create a class of objects of type "train" ...

1. 3 carriages, 120 per carriage, to London,
                leaves at 07:40, operated by Henry
2. 5 carriages, 65 per carriage, to Edinburgh,
                leaves at 07:45, operated by Gordon
3. 2 carriages, 100 per carriage, to Bicester,
                leaves at 07:50, operated by Thomas

Put those objects into a dictionary, keyed by the operating engine (don't have the operator in the object).
Output the time, length and capacities of each, and then do the same again this time sorted by capacity. """

class train (object):
        def __init__(self,c,cap,t,d):
       = c
                self.cap = cap
                self.t = t
                self.d = d
        def getcarriages(self):
        def getcapa(self):
                return self.cap
        def getdest(self):
                return self.d
        def getbums(self):
                return * self.cap
        def __str__(self):
                return "The train to " + self.d

def bypeeps(dis,dat):
        return services[dat].getbums() - services[dis].getbums()

services = {"Henry" : train(3,120,"07:40","London"),
        "Gordon" : train(5,65,"07:45","Edinburgh"),
        "Thomas" : train(2,100,"07:50","Bicester")}

        trips = services.keys()
        trips.sort(bypeeps) # Throws exception in Python 3!
        trips = list(services.keys())
        trips.sort(key=lambda x:services[x].getbums())

for engine in trips:
        a = services[engine].getcarriages()
        b = services[engine].getcapa()
        d = services[engine].getbums()
        print(("{} "*5).format(a,b,d,engine,services[engine]))

""" Sample Answer

WomanWithCat:y107 grahamellis$ python2 nx
3 120 360 Henry The train to London
5 65 325 Gordon The train to Edinburgh
2 100 200 Thomas The train to Bicester
WomanWithCat:y107 grahamellis$ python3 nx
2 100 200 Thomas The train to Bicester
5 65 325 Gordon The train to Edinburgh
3 120 360 Henry The train to London
WomanWithCat:y107 grahamellis$


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Python
 * Python 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 Python 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 "Dictionaries" training module. You'll find a description of the topic and some other closely related examples on the "Dictionaries" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

Web site author
This web site is written and maintained by Well House Consultants.

Conditions of use
Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details.

Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request.

© WELL HOUSE CONSULTANTS LTD., 2023: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: • WEB: • SKYPE: wellho

PAGE: • PAGE BUILT: Sun Oct 11 14:50:09 2020 • BUILD SYSTEM: JelliaJamb