iset.py

class iset(object):
#	matrix = []
	
	def __init__(self, mat = []):
		# method - __init__ - constructor
		self.matrix = mat
	
	def __xor__(self, other):
		value_1 = self - other
		value_2 = other - self
		return iset(value_1 + value_2)
	
	def __and__(self, other):
		imatrix = []
		for i in self.matrix:
			found = False
			for j in other.matrix:
				if i == j:
					found = True
			if found is True:
				imatrix.append(i)
		return imatrix
	
	def __add__(self, other):
		imatrix = []
		for item in other.matrix:
			imatrix.append(item)
		for i in self.matrix:
			found = False
			for j in other.matrix:
				if i == j:
					found = True
			if found is False:
				imatrix.append(i)
		return imatrix

	def __sub__(self, other):
		imatrix = []
		for i in self.matrix:
			found = False
			for j in other.matrix:
				if i == j:
					found = True
			if found is False:
				imatrix.append(i)
		return imatrix
	
	def contains(self, value):
		found = False
		for i in self.matrix:
			if i == value:
				found = True
		return found
	
	def __str__(self):
		return str(self.matrix)
	
if __name__ == "__main__":
	
	A = iset([1,2,3,4,5])
	B = iset([4,5,6,7,8])
	C = iset([4,5,1,8,9])
	
#	differance1 = A - B - C
	differance2 = B - A
	intersections = A & B
#	print(differance1)
	
	
	q = {1,2,3,4,5}
	w = {3,4,7,9,12}
	e = {4,3,5,67,4}
	
	print(q - w - e)
	
	print()