# 6.00 Problem Set 9
#
# Name:
# Collaborators:
# Time:
from string import *
class Shape(object):
def area(self):
raise AttributeException("Subclasses should override this method.")
class Square(Shape):
def __init__(self, h):
"""
h: length of side of the square
"""
self.side = float(h)
def area(self):
"""
Returns area of the square
"""
return self.side**2
def __str__(self):
return 'Square with side ' + str(self.side)
def __eq__(self, other):
"""
Two squares are equal if they have the same dimension.
other: object to check for equality
"""
return type(other) == Square and self.side == other.side
class Circle(Shape):
def __init__(self, radius):
"""
radius: radius of the circle
"""
self.radius = float(radius)
def area(self):
"""
Returns approximate area of the circle
"""
return 3.14159*(self.radius**2)
def __str__(self):
return 'Circle with radius ' + str(self.radius)
def __eq__(self, other):
"""
Two circles are equal if they have the same radius.
other: object to check for equality
"""
return type(other) == Circle and self.radius == other.radius
#
# Problem 1: Create the Triangle class
#
## TO DO: Implement the `Triangle` class, which also extends `Shape`.
#
# Problem 2: Create the ShapeSet class
#
## TO DO: Fill in the following code skeleton according to the
## specifications.
class ShapeSet:
def __init__(self):
"""
Initialize any needed variables
"""
## TO DO
def addShape(self, sh):
"""
Add shape sh to the set; no two shapes in the set may be
identical
sh: shape to be added
"""
## TO DO
def __iter__(self):
"""
Return an iterator that allows you to iterate over the set of
shapes, one shape at a time
"""
## TO DO
def __str__(self):
"""
Return the string representation for a set, which consists of
the string representation of each shape, categorized by type
(circles, then squares, then triangles)
"""
## TO DO
#
# Problem 3: Find the largest shapes in a ShapeSet
#
def findLargest(shapes):
"""
Returns a tuple containing the elements of ShapeSet with the
largest area.
shapes: ShapeSet
"""
## TO DO
#
# Problem 4: Read shapes from a file into a ShapeSet
#
def readShapesFromFile(filename):
"""
Retrieves shape information from the given file.
Creates and returns a ShapeSet with the shapes found.
filename: string
"""
## TO DO