Define 3 python classes. Dot, Line and Rectangle. Dot has coordinates x and y. Line has 2 Dots and Rectangle has 4 Lines. Rectangle has method named "get_dots" that prints coordinates of all its Dots into standard output. Instantiate all the classes.

dots.py

'''
	Define 3 python classes. Dot, Line and Rectangle. Dot has coordinates x and y. Line has 2 Dots and Rectangle has 4 Lines. Rectangle has method named "get_dots" that prints coordinates of all its Dots into standard output. Instantiate all the classes.
'''

class Dot(object):
	
	def __init__(self, x, y):
		self.x = x
		self.y = y
	
	def __str__(self):
		return '(%s, %s)' % (self.x , self.y)	

class Line(object):

	def __init__(self, start, end):
		self.start = start
		self.end = end
	
	def __str__(self):
		return '%s : %s' % (self.start,self.end)	

class Rectangle:
	def __init__(self, top, right, bottom, left):
		self.top = top
		self.right = right
		self.bottom = bottom
		self.left = left

	def get_dots(self):
		print self.top, self.right, self.bottom, self.left


topStart = Dot(0,0)
topEnd = Dot(100, 0)
topLine = Line(topStart, topEnd)

rightStart = Dot(100,0)
rightEnd = Dot(100, 100)
rightLine = Line(rightStart, rightEnd)


bottomStart = Dot(100,100)
bottomEnd = Dot(0, 100)
bottomLine = Line(bottomStart, bottomEnd)


leftStart = Dot(0,100)
leftEnd = Dot(0, 0)
leftLine = Line(leftStart, leftEnd)

rect = Rectangle(topLine, rightLine, bottomLine, leftLine)

rect.get_dots()