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Test driven exercise
Code testing, patterns, profiles and optimisation. example from a Well House Consultants training course
More on Code testing, patterns, profiles and optimisation. [link]
Source code: annie.py Module: Y212

""" Example ..

Exercise ... here is some data about tables

Put this in a data file:

Rect 1900 1900 Oak
Rect 1800 2400 Pine
Circ 2000 Maple
Rect 1500 2400 Birch

Write a factory and series of classes so this works:

rest = []
for lyne in open("cheznous.txt"):
        rest.append(table.factory(lyne))
seats = 0
materials = []
for tab in rest:
        seats += tab.getseats()
        materials.append(tab.getmaterial())

print "We can seat",seats,"at tables of", " ".join(materials)

"""


class animal(object):
        def __init__(current,breed,age,factor):
                current.age = age
                current.hisfactor = factor
        def getEffectiveAge(this):
                ea = this.age * this.hisfactor
                return ea
        def __str__(this):
                itsa = this.__class__.__name__
                called = this.getName()
                return "A %s animal called %s" % (itsa,called)
        def getOlder(this,that):
                a1 = this.getEffectiveAge()
                a2 = that.getEffectiveAge()
                if a2 > a1: return that
                return this
# "P\tdog\tGypsy\t5\t7\tBlack and White\n"
        @staticmethod
        def factory(rawline):
                fields = rawline.strip().split("\t")
                ob = None
                if fields[0] == "P":
                        ob = pet(fields[2],fields[1],
                                float(fields[3]),float(fields[4]),
                                fields[5])
                elif fields[0] == "F":
                        ob = farm(fields[1],
                                float(fields[2]),float(fields[3]),
                                fields[4])
                else:
                        pass
                        # error handler?
                return ob
        @staticmethod
        def getOldest(collect):
                sofar = collect[0]
                for posn in range(1,len(collect)):
                        sofar = sofar.getOlder(collect[posn])
                return sofar
        # getOldest = staticmethod(getOldest)
class pet(animal):
        def __init__(current,name,breed,age,factor,colour):
                super(pet,current).__init__(breed,age,factor)
                current.name = name
        def getName(this):
                return this.name
class farm(animal):
        def __init__(current,breed,age,factor,subbreed):
                super(farm,current).__init__(breed,age,factor)
        def getName(this):
                return "We DON'T give farm animals names"

if __name__ == "__main__":
        billy = pet("William","dog",3,7,"Black and White")
        tufty = pet("Tufty","G.Pig",2,14,"Brown and White")
        ermintrude = farm("Cow",3,10,"Fresian")

        fromFile = "P\tdog\tGypsy\t5\t7\tBlack and White\n"
        another = animal.factory(fromFile)

        mybeasts = (billy, tufty, ermintrude, another)

        for beast in mybeasts:
                a1 = beast.getEffectiveAge()
                print a1, beast

        older = billy.getOlder(tufty)
        print "older is",older

        oldest = animal.getOldest(mybeasts)
        print "oldest is",oldest


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

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Other Examples
This example comes from our "Code testing, patterns, profiles and optimisation." training module. You'll find a description of the topic and some other closely related examples on the "Code testing, patterns, profiles and optimisation." module index page.

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