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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.
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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$
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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.

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