Programming Coursework Solution

Part 1 - Data Extraction (25%)




To complete this part of the assignment, you will process a phone log which contains telephone numbers in international formats.




Your task is to:




 
Extract the telephone numbers for the UK




 
Remove the international dialling code, replacing it with a zero.




 
Order them lexicographically




 
Print them in a specific format.




The phone numbers have a prefix of +44 and are followed by ten digits. Phone numbers may include spaces.




Example valid numbers: +44 7777 888888, +441231231231, +44 12444 444 4 4




Example invalid numbers: +34 7777 888888, +4411111111111222211




Your program will be invoked with a filename as follows:




python phone.py <datafile




The file phone_log.txt is provided as a sample data file. A sample of the file can be seen below:




Phone call from +55 3138 745765 to +60 5757 946460

Whatsapp from +36 6535 355865 to +38 6092 270440




Whatsapp from +8 8779 628569 to +51 8241 571938




Phone call from +20 3314 854413 to +60 4981 365126




Your program should output numbers in the format XXXXX XXXXXX, that is five characters then a space followed by six characters.




01111 111111




01234 111112




The mark allocation for this section is as follows, 15% for correctly functioning program, 10% for quality of code giving rise to the output.




Part 2 - Shapes on the plane (45%)




This part of the assignment does not focus on mathematical problems or any advanced programming techniques. Instead the focus is on your ability to solve a problem using a small number of classes in the Python programming language.




You are given a set of data stored in a text file. The data defines a set of shapes (circles and squares) defined in a 2D space. A sample of the data file format is shown below.




Circle
1.2222
3.333
1.44444
Circle
-0.3
0.13
0.0000005
Square
0.0
0.0222
6.5555



The format comprises:




 
The type of shape represented by the line




 
The x coordinate of the centre of the circle or the top left corner of the square




 
The y coordinate of the centre of the circle or the top left corner of the square




 
The radius of the circle or side length of the square




Your task is to write some code which will classify and analyse the set of shapes. The information that you need to extract from this set of data is:




 
The total number of shapes in the set. The largest and smallest area of each type of shape in the file.




 
The average (mean) area for each shape type in the file.




 
The standard deviation of areas of each shape in the file.




 
The median of the areas.




When reading the descriptions of the shapes from the file, you will need to ignore those which are “singular”, i.e. those circles for which the radius is equal to zero or squares which have a side length of zero, within a certain tolerance (described below).




Programming Instructions and Hints




The code should be structured in a object oriented manner, with classes describing their actions.




The files provided on the module webpage have some predefined methods and some methods which you are required to complete. You must keep the names of all methods as they are in the templates. The file defines five basic classes for you project.




 
Point - which represents a point in 2D space




 
Shape - a class which contains the Tolerance constant required.




 
Circle - which extends Shape to add functionality specific to circles.




 
Square - which extends Shape to add functionality specific to squares.




 
Assignment - should use the above classes to do the required analysis.

 
 

 
In addition to the template file there are also two data files (small and large) for you to test your solutions with.




The Point Class




The point class should contain:




 
Constructors, setters, getters and the equals method which allows us to compare two points.




 
In particular the comparison between two points is important and different for the usual mathematical notion of equality. Due to the way that floating point numbers are represented in computer memory, we never usually test whether two floating point numbers are equal; just whether they are ‘close’ to within a given tolerance. The tolerance used for this course work is 0.000001 and this is stored as a constant accessible as Shape.TOLERANCE




 
Implement a distance method which computes the Euclidean distance between two points.




The Shape Class




This class is abstract, and cannot be instantiated. The tolerance used for calculations is stored as Shape.TOLERANCE. You do not need to edit this class.




The Circle Class




You will now need to define the methods which are pertinent to Circle.




 
You should start by defining two variables to store the centre of the circle as a Point and the radius of the circle as a floating point number.




 
Define standard constructors, getters and setters




 
Override __str__ to print out a string in the format below.




This circle has its centre at (2,3) and a radius of 2.4.




 
The equals method compares two circles. Two circles are equal if they have the same centres and radii (within the given tolerance).




 
Complete the area method.




 
Complete the envelops method which tests whether the current instance of Circle envelops (contains) the shape provided as a parameter. The shape could be either a circle or a square.

 
Complete the compare method. This method should return -1 if this object’s area is smaller than otherObject’s area, 0 if they have the same area and 1 if this object has a larger area then otherObject




The Square Class




You will now need to define the methods which are pertinent to Square.




 
You should start by defining two variables to store the top-left corner of the square as a Point and the length of the side as a floating point number.




 
Define standard constructors, getters. setters




 
Override __str__ to print out a string in the format below.

This square’s top left corner is at (2,3) and the side length is 4.




 
The method equals that compares two squares. Obviously two squares are equal if they have the same corners and side lengths within the given tolerance.




 
Complete the area method.




 
Define the envelops method which tests whether the current instance of Square envelops (contains) the shape provided as a parameter. The shape could be either a circle or a square.

 
Complete the compare method. This method should return -1 if this object’s area is smaller than otherObject’s area, 0 if they have the same area and 1 if this object has a larger area then otherObject.




The Assignment Class




In this class you will perform the statistical analysis of the data.

Your analyse method will be called to compute the required statistics. Only non-singular shapes should be considered in the calculations.



You should then return the statistics via the methods defined in the file:




shape_count(self): - the number of shapes in the file




circle_count(self): - the number of circles in the file




square_count(self): - the number of squares in the file




max_circle_area(self): - the maximum area of a circle in the file




min_circle_area(self): - the minimum area of a circle in the file




max_square_area(self): - the maximum area of a square in the file




min_square_area(self): - the minimum area of a square in the file




mean_circle_area(self): - the mean of the circle areas




mean_square_area(self): - the mean of the square areas




std_dev_circle_area(self): - the standard deviation in the area of the circles




std_dev_square_area(self): - the standard deviation in the area of the circles




median_circle_area(self): - the median area of the circles




median_square_area(self): - the median area of the squares




You may add instance variables and methods as required, however the existing method names and parameters should not be altered.




You should create data files of you own to test your system.




The mark allocation for this section is as follows, 35% for correctly functioning program, 10% for quality of code produced.




Part 3 - Word Games (30%)




For this part of the assignment you are going to write the class that will represent a board for a word game (e.g. Scrabble or Words with Friends). This part of the assignment is more difficult than the first, and will require you to work with less guidance.




The LetterTile Class




This class is complete. You do not have to edit this class.



The GameBoard Class




This is the class that represents the board. It has a number of incomplete methods that you are required to implement. Please refer to the part3.py file for full description.




For the purpose of this assignment, a word is valid if it consists of any two or more characters e.g.




AFFEETTRTWZ is a valid word. The image below is an example:











































The mark allocation for this section is as follows, 15% for correctly functioning program, 15% for quality of code produced for the application.