Question

import math
'''
Finish the code below as described.
Use the completed class Square as an example.
'''

class Square:
    '''
    Each Square has a width and can calculate
    its area, its perimeter, and return a string
    representation of itself.
    '''
    
    def __init__(self, width):
        '''
        (float) -> None
        Create a new Square with the given width.
        '''
        
        self.width = width

    def get_area(self):
        '''
        () -> float
        Return this square's area.
        '''
        
        return self.width*self.width

    def get_perimeter(self):
        '''
        () -> float
        Return this square's perimeter.
        '''
        
        return 4*self.width

    def __str__(self):
        '''
        () -> str
        Return string representation of this square.
        '''
        
        s = "A Square with width {0} ".format(self.width)
        s = s + "area {0} and perimeter {1}".format(self.get_area(), self.get_perimeter())
        return s

class Rectangle:
    '''
    Each rectangle has a width and height and
    can calculate its area, its perimeter, and can
    return a string representation of itself.

    Complete the class Rectangle below.
    '''
    
    def __init__(self, width, height):
        '''
        (float, float) -> None
        Create a new rectangle with the given width and height.
        '''

        pass # YOUR CODE GOES HERE

    def get_area(self):
        '''
        () -> float
        Return the area of this rectangle.
        '''
        
        pass # YOUR CODE GOES HERE

    def get_perimeter(self):
        '''
        () -> float
        Return the perimeter of this rectangle.
        '''
        
        pass # YOUR CODE GOES HERE

    def __str__(self):
        '''
        () -> str
        Return a string representation of this rectangle.
        '''
        
        pass # YOUR CODE GOES HERE


class Circle:
    '''
    Each circle has a radius and can calculate
    its area, its perimeter, and can
    return a string representation of itself.
    
    Complete class Circle below.
    '''
    
    def __init__(self, radius):
        '''
        (float) -> None
        Create a new Circle with the given radius.
        '''
        
        self.radius = radius

    # YOUR CODE GOES HERE
    # YOU NEED TO DEFINE get_area, get_perimeter, __str__

    # define get_area(self) below
    # Hint: use math.pi

    # define get_perimeter
    # Hint: use math.pi

    # define __str__

class Triangle:
    '''
    Each triangle knows the lengths of its three sides
    and can calculate its area, its perimeter, and can
    return a string representation of itself.
    
    Complete class Triangle below.
    '''

    def __init__(self, side1, side2, side3):
        '''
        (float, float, float) -> None
        Create a new triangle given the lengths of its
        three sides.
        '''
        self.side1 = side1
        self.side2 = side2
        self.side3 = side3

    # YOUR CODE GOES HERE
    # define get_area
    # Hint: Use Herons formulae, use math.sqrt(x)
    # p = 1/2 perimeter
    # area = sqrt(p(p-side1)(p-side2)(p-side3))
    # http://www.mathopenref.com/heronsformula.html

    # define get_perimeter

    # define __str__

s1 = Square(100) # This creates a new square with a width of 100; calls Square.__init__(self, 100)

print(str(s1)) # This automatically calls the __str__ method of Square

s2 = Square(5) # Now there are two squares

print("First Square: "+str(s1))
print("Second Square: "+str(s2))

r1 = Rectangle(10,20)
print(str(r1))

c1 = Circle(5)
print(str(c1))

t1 = Triangle(3,4,5)
print(str(t1))

'''
Output of above should be .............................................

A Square with width 100 area 10000 and perimeter 400
First Square: A Square with width 100 area 10000 and perimeter 400
Second Square: A Square with width 5 area 25 and perimeter 20
A Rectangle with width 10 and height 20, area 200 and perimeter 60
A Circle with radius 5 area 78.53981633974483 and perimeter 31.41592653589793
A Triangle with sides 3, 4, 5, area 6.0 and perimeter 12

Process finished with exit code 0
'''

Answer 1

Solution

import math
'''
Finish the code below as described.
Use the completed class Square as an example.
'''

class Square:
'''
Each Square has a width and can calculate
its area, its perimeter, and return a string
representation of itself.
'''
  
def __init__(self, width):
'''
(float) -> None
Create a new Square with the given width.
'''
  
self.width = width

def get_area(self):
'''
() -> float
Return this square's area.
'''
  
return self.width*self.width

def get_perimeter(self):
'''
() -> float
Return this square's perimeter.
'''
  
return 4*self.width

def __str__(self):
'''
() -> str
Return string representation of this square.
'''
  
s = "A Square with width {0} ".format(self.width)
s = s + "area {0} and perimeter {1}".format(self.get_area(), self.get_perimeter())
return s

class Rectangle:
'''
Each rectangle has a width and height and
can calculate its area, its perimeter, and can
return a string representation of itself.

Complete the class Rectangle below.
'''
  
def __init__(self, width, height):
'''
(float, float) -> None
Create a new rectangle with the given width and height.
'''

self.width = width
self.height = height

def get_area(self):
'''
() -> float
Return the area of this rectangle.
'''
  
return self.height*self.width

def get_perimeter(self):
'''
() -> float
Return the perimeter of this rectangle.
'''
  
return 2*(self.height+self.width)

def __str__(self):
'''
() -> str
Return a string representation of this rectangle.
'''
  
s = "A Rectangle with width {0} and height {1}, ".format(self.width,self.height)
s = s + "area {0} and perimeter {1}".format(self.get_area(), self.get_perimeter())
return s

class Circle:
'''
Each circle has a radius and can calculate
its area, its perimeter, and can
return a string representation of itself.
  
Complete class Circle below.
'''
  
def __init__(self, radius):
'''
(float) -> None
Create a new Circle with the given radius.
'''
  
self.radius = radius
  
def get_area(self):
'''
() -> float
Return the area of this rectangle.
'''
  
return math.pi*self.radius*self.radius

def get_perimeter(self):
'''
() -> float
Return the perimeter of this rectangle.
'''
  
return 2*math.pi*self.radius
  
def __str__(self):
'''
() -> str
Return a string representation of this rectangle.
'''
  
s = "A Circle with radius {0} ".format(self.radius)
s = s + "area {0} and perimeter {1}".format(self.get_area(), self.get_perimeter())
return s

# YOUR CODE GOES HERE
# YOU NEED TO DEFINE get_area, get_perimeter, __str__

# define get_area(self) below
# Hint: use math.pi

# define get_perimeter
# Hint: use math.pi

# define __str__

class Triangle:
'''
Each triangle knows the lengths of its three sides
and can calculate its area, its perimeter, and can
return a string representation of itself.
  
Complete class Triangle below.
'''

def __init__(self, side1, side2, side3):
'''
(float, float, float) -> None
Create a new triangle given the lengths of its
three sides.
'''
self.side1 = side1
self.side2 = side2
self.side3 = side3

# YOUR CODE GOES HERE
# define get_area
# Hint: Use Herons formulae, use math.sqrt(x)
# p = 1/2 perimeter
# area = sqrt(p(p-side1)(p-side2)(p-side3))
# http://www.mathopenref.com/heronsformula.html

# define get_perimeter

# define __str__

def get_area(self):
'''
() -> float
Return the area of this rectangle.
'''
p = self.get_perimeter()/2
return math.sqrt(p*(p-self.side1)*(p-self.side2)*(p-self.side3))

def get_perimeter(self):
'''
() -> float
Return the perimeter of this rectangle.
'''
  
return self.side1+self.side2+self.side3

def __str__(self):
'''
() -> str
Return a string representation of this rectangle.
'''
  
s = "A Triangle with sides {0}, {1}, {2}, ".format(self.side1,self.side2,self.side3)
s = s + "area {0} and perimeter {1}".format(self.get_area(), self.get_perimeter())
return s
  
s1 = Square(100) # This creates a new square with a width of 100; calls Square.__init__(self, 100)

print(str(s1)) # This automatically calls the __str__ method of Square

s2 = Square(5) # Now there are two squares

print("First Square: "+str(s1))
print("Second Square: "+str(s2))

r1 = Rectangle(10,20)
print(str(r1))

c1 = Circle(5)
print(str(c1))

t1 = Triangle(3,4,5)
print(str(t1))

Output

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