Python代写：COMP2990 Simple Fraction

实现Simple Fraction程序，并完成对应的单元测试。

Requirement

Your solution will be evaluated according to the grading rubric available on CANVAS in the Resources section.

Programming Component

Program: Simple Fraction

Files:

• Submit: SimpleFraction.py
• Starter files: FractionTextPresenter.py
• Download FractionTextPresenter.py
  • FractionTurtlePresenter.py
• Download FractionTurtlePresenter.py

This week you’ll be implementing your own simple Fraction class. The Python library has a similar class for use, but this week’s homework will have you create your own simplified version.

Task Overview

Create a SimpleFraction class that manages rational numbers. Your class must implement the following methods (if you want to implement more than these, that’s fine - but these are the minimum operations your class must support):

• __init__(self, numerator, denominator): Create a new SimpleFraction instance by supplying integer values for the numerator and denominator.
  Your method should also be able to handle the case where client code does not supply any parameters (we call this a “default constructor). Use default values of 1 and 1 for the numerator and denominator, so creation requests like the following should be supported by your solution: fract = SimpleFraction()

In general, any values pass to __init__ that are not integers should raise a ValueError

• get_numerator(self): returns the value of the SimpleFraction’s numerator
• get_denominator(self): returns the value of the SimpleFraction’s denominator
• make_reciprocal(self): Returns a new SimpleFraction instance that has the current instance’s numerator as its denominator, and the current instance’s denominator as its numerator. This is a NON-MUTATING method, so the current instance is not modified. A new SimpleFraction instance is returned
• validate(self): Checks to ensure that the numerator and denominator are integers. If either of the values are NOT integers, this method raises a ValueError
• multiply(self, other): Multiplies the current instance with another

SimpleFraction OR a whole number (scalar). Returns the result. This is a NON-MUTATING method, so the current instance is not modified. A new SimpleFraction instance is returned divide(self, other): Divides the current instance with another SimpleFraction OR a whole number (scalar). Returns the result. This is a NON-MUTATING method, so the current instance is not modified. A new SimpleFraction instance is returned

• __str__(self): Returns a string representation of SimpleFraction instances
• __eq__(self, other): Compares current SimpleFraction instance to another one. Returns True if they are equal, False otherwise

Additionally

Ensure that your SimpleFraction class works with, and is able to be “plugged” into my FractionTextPresenter and FractionTurtlePresenter (starter code). These are “views” that allows us to represent your model on the console or on the Turtle canvas.

Notes

• It is NOT a requirement to store SimpleFractions in their simplest reduced form. For example, a SimpleFraction 2/4 is perfectly acceptable rather than storing it as 1/2. However, those two SimpleFractions, when compared with each other, should be equal.
• Your SimpleFraction should be able to multiply and divide whole numbers as well as other SimpleFractions. So, if x is a SimpleFraction holding 1/2, x.multiply(x) would return a SimpleFraction 1/4. x.multiply(4) would return a SimpleFraction 4/2.
• Please ensure your class is named precisely as indicated (SimpleFraction - using PascalCase)

Program: Testing Simple Fraction

Files:

• Submit: TestSimpleFraction.py

Task Overview

Create a SimpleFractionTest class that tests the SimpleFraction class you created. Your test class must use the PyUnit framework, so ensure it inherits from unittest.TestCase

Your grade for this portion of the homework will be determined by your test class and the sufficiency of testing you do for the methods you implemented for SimpleFraction.

Note: You are only required to test the features of SimpleFraction. You are NOT required to validate the TextPresenter or TurtlePresenter or the compatibility of SimpleFraction with either of those two components. This portion of the assignment is focused solely on validating SimpleFraction.