Build a Polygon Area Calculator - Build a Polygon Area Calculator

Curriculum Help
1

Tell us what’s happening:

Hi, I keep failing test #16, and actually, I realise that one of my problems is that if I set a new height or a new width for a square, only one side changes, and then both sides are not equal, which is, I suppose, the reason why I fail. But I am not sure how I can make sure that if I change any side of square (height or width), all sides get automatically changed and equal. Can you please put me on the right track?

Your code so far

class Rectangle:
    def __init__(self, width, height):
        self.width = width 
        self.height = height 

    def set_width(self,width):
        self.width = width

    def set_height(self, height):
        self.height = height

    def get_area(self):
        return self.width * self.height

    def get_perimeter(self):
        return 2 * (self.width + self.height)

    def get_diagonal(self):
        return((self.width ** 2 + self.height ** 2) ** 0.5)

    def get_picture(self):
        if self.width > 50 or self.height > 50:
            return "Too big for picture."
        else:
            picture = ''
            for i in range(0, self.height):
                picture += "*" * self.width + '\n'
            return picture

    def __str__(self):
        return f'Rectangle(width={self.width}, height={self.height})'

    def get_amount_inside(self, shape):
        times = 0 
        if (shape.width < self.width) and (shape.height < self.height):
            times = (self.height // shape.height) * (self.width // shape.width)
            return times
        else:
            times = 0 
            return times


class Square(Rectangle):
    def __init__(self, side):
        Rectangle.width = side 
        Rectangle.height = side 

    def set_side(self,side):
        Rectangle.width = side 
        Rectangle.height = side 
  
    def set_width(self, side):
        Rectangle.width = side 

    def set_height(self, side):
        Rectangle.height = side

    def __str__(self):
        return f'Square(side={Rectangle.width})'

rect = Rectangle(10, 5)
print(rect.get_area())
rect.set_height(3)
print(rect.get_perimeter())
print(rect)
print(rect.get_picture())

sq = Square(9)
print(sq.get_area())
sq.set_side(4)
print(sq.get_diagonal())
sq.set_width(6)
print(sq)
print(sq.get_picture())

rect.set_height(8)
rect.set_width(16)
print(rect.get_amount_inside(sq))

sq = Square(5)
print(sq)

sq.set_height(2)
print(sq)

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Safari/605.1.15

Challenge Information:

Build a Polygon Area Calculator - Build a Polygon Area Calculator

2

here you are using Rectangle a lot, is that how you set the properties of Square?

3

Actually, I thought I should replace Rectangle by Square, but then I not only fail test #16 but also #18. I am lost. I have the impression it is simple, but I do not see the solution.

4

here you are doing this, right?

5

I thought I was on the right track with your comments, but keep failing test #16

class Rectangle:
    def __init__(self, width, height):
        self.width = width 
        self.height = height 

    def set_width(self,width):
        self.width = width

    def set_height(self, height):
        self.height = height

    def get_area(self):
        return self.width * self.height

    def get_perimeter(self):
        return 2 * (self.width + self.height)

    def get_diagonal(self):
        return((self.width ** 2 + self.height ** 2) ** 0.5)

    def get_picture(self):
        if self.width > 50 or self.height > 50:
            return "Too big for picture."
        else:
            picture = ''
            for i in range(0, self.height):
                picture += "*" * self.width + '\n'
            return picture

    def __str__(self):
        return f'Rectangle(width={self.width}, height={self.height})'

    def get_amount_inside(self, shape):
        times = 0 
        if (shape.width < self.width) and (shape.height < self.height):
            times = (self.height // shape.height) * (self.width // shape.width)
            return times
        else:
            times = 0 
            return times


class Square(Rectangle):
    def __init__(self, side):
        super().__init__(side, side)
        self.side = side 
        self.side = side 

    def set_side(self,side):
        self.width = side 
        self.height = side 
  
    def set_width(self, side):
        self.width = side 

    def set_height(self, side):
        self.height = side

    def __str__(self):
        return f'Square(side={self.width})'
6

test it, does it change as it should?

sq = Square(3)
print(sq)
sq.set_width(4)
print(sq)
sq.set_height(5)
print(sq)
7

No, it does not give me the right answer for set_height(5), and that is what I do not understand. because it does give me the right answer for set-width(4).

8

Please review User Story #6 again:

image
image497×275 21 KB

9

What I do not understand is that, using the same syntax for set_width and for set_height in the Square section, I get the right output for set_width (Square(side = number put as test) but I get the wrong output for set_height. So, the new set_width overrides the previous set_width method, but it is not the case for set_height. Can you please share explanations as to why?

10

it does do what you say, but you need to consider one more thing, aren’t width and height always supposed to be the same in a Square?

you also create a self.side but then never use it other than in __init__

11

Yes, that is the point I am troubled with: how can I make sure that the sides are equal?

12

Start from here:

When a Square object is created, it should be initialized with a single side length. The __init__ method should store the side length in both the width and height

are you doing this?

13

I found the solution, thanks!!