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HOMEWORK WEEK 1

25 marks in total

The purpose of this homework is for you to gain a greater context into how the concept of OOP is modelled and implemented.

TASK 1 - Understanding UML Diagrams

This task is unmarked but tells you what you need to know for later tasks.

The above is an example of a UML (Uniﬁed Modelling Language) diagram, also known as a class diagram. It is the most well known and regularly used visual representation of programs that you’ll ﬁnd.

These are very useful when you’re trying to plan your classes and especially handy in visualising what methods and attributes are being inherited or overridden in a system. For example the - and + symbols distinguish between methods and attributes, and the white arrow indicates inheritance.

This diagram visualises one of the OOP Tasks gone over in OOP Lesson 1. The diagram tells us that:

1. There’s a parent class Shape

a. This class has no attributes

b. There is an abstract method called calc_perimeter

2. There’s a child class called Triangle

a. Class has three attributes a, b and c

b. The method calc_perimeter is implemented

TASK 2 - Implementing UML Diagrams - 15 MARKS

The following is an extension of the UML diagram in the last section.

Make a new python ﬁle and build on the code from the session so it is reﬂective of this diagram.

You can ﬁnd the session starter code here:

import abc

class Shape (object):

__metaclass__ = abc.ABCMeta

@abc.abstractmethod

def calc_perimeter (self, input):

"""Method documentation """

return

class Triangle (Shape):

def __init__ (self, a, b, c):

self.a = a

self.b = b

self.c = c

def calc_perimeter (self):

perim = self.a + self.b + self.c

print("Consider me implemented", perim)

return perim

After implementation, create an instance of each new class and for both, print out the result of the calc_perimeter method.

TASK 3 - Creating UML Diagrams - 10 MARKS

The following is a code block from OOP Lesson 2:

from abc import abstractmethod

class PlaySongsLyrics:

@abstractmethod

def sing_lyrics (self):

pass

class PlaySongsMusic:

@abstractmethod

def play_guitar (self):

pass

@abstractmethod

def play_drums (self):

pass

class PlayInstrumentalSong(PlaySongsMusic):

def play_drums (self):

print("Bum-bum-bum")

def play_guitar (self):

print("Some guitar solo*")

class PlayRockSong(PlaySongsMusic, PlaySongsLyrics):

def play_guitar (self):

print("Heavy metal guitar solo*")

def sing_lyrics (self):

print("We will, we will rock you")

def play_drums (self):

print("Bum-bum-bum")

Make a UML Diagram that visualises the class relationships, attributes and methods for the above code.

You can do this on draw.io (a free online option which has a template for class diagrams), Microsoft Visio, and there are also more options out there if you wish.

Once you have ﬁnished your diagram you will need to export it as an image ﬁle for submission.

SUBMISSION CRITERIA:

● This homework is to be submitted solely via GitHub.