Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
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.
March 2015 / multiple classes in Python
Object Orientation: Composite Objects example from a Well House Consultants training course
More on Object Orientation: Composite Objects [link]

This example is described in the following article(s):
   • Deciding whether to use parameters, conditional statements or subclasses - [link]

Source code: transport.py Module: Q909
# March 2015 / multiple classes in Python

class transport(object):
        def getDestiny(current):
                return current.goto
        def getTime(current):
                return current.departs
        def _setup(current,when,where,seats):
                current.departs = when
                current.goto = where
                current.seats = seats

class train (transport):
        def __init__(current,when,where,length,seats):
                current._setup(when, where, seats)
                current.size = length
                current.squeeze = 1.5
        def getCapacity(current,squeeze = 1.4):
                current.squeeze = squeeze
                return int(current.size * current.seats * squeeze)

class bus (transport):
        def __init__(current,when,where,seats):
                current._setup(when, where, seats)
                current.size = 1
                current.squeeze = 6
        def getCapacity(current,squeeze = 15):
                current.squeeze = squeeze
                return int(current.size * current.seats + squeeze)

# Above here - expert code
# ---------------------------------------------
# Below here - test code / first checks

if __name__ == "__main__":
        first = train("06:38","Southampton",2,75)
        second = train("07:20","Cheltenham Spa",3,81)
        late = bus("22:47","Trowbridge",37)
        service = [first,second,late,train("07:49","Swindon",1,78)]

        for option in service:
                pcount = option.getCapacity()
                whatsit = option.__class__.__name__
                print "That",whatsit,"will take",pcount,"people to",option.getDestiny(),"starting at",option.departs

# trainee@kingston:~/m15py$ python transport.py
# That train will take 210 people to Southampton starting at 06:38
# That train will take 340 people to Cheltenham Spa starting at 07:20
# That bus will take 52 people to Trowbridge starting at 22:47
# That train will take 109 people to Swindon starting at 07:49
# trainee@kingston:~/m15py$
Learn about this subject

Books covering this topic
Yes. We have over 700 books in our library. Books covering all the subjects we teach 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 "Object Orientation: Composite Objects" training module. You'll find a description of the topic and some other closely related examples on the "Object Orientation: Composite Objects" 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.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2021: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/resources/ex.php • PAGE BUILT: Sun Oct 11 14:50:09 2020 • BUILD SYSTEM: JelliaJamb