7_stackN.py

class Stack:
    def __init__(self, N):
        self.sinir = N
        self.items = []

    def isEmpty(self):
        return self.items == []

    def push(self, item):
        if len(self.items) < self.sinir:
            self.items.append(item)
        else:
            print "Yigit dolu."

    def pop(self):
        return self.items.pop()

    def peek(self):
        return self.items[len(self.items)-1]

    def size(self):
        return len(self.items)

deqStack.py

class Deque:
    def __init__(self):
        self.items = []

    def isEmpty(self):
        return self.items == []

    def addFront(self, item):
        self.items.append(item)

    def addRear(self, item):
        self.items.insert(0,item)

    def removeFront(self):
        return self.items.pop()

    def removeRear(self):
        return self.items.pop(0)

    def size(self):
        return len(self.items)


class deqStack(Deque):
	def __init__(self):
		Deque.__init__(self)
		self.items = []
	def isEmpty(self):
		return self.items == []
		
	def push(self, item):
		return self.addFront(item)
		
	def pop(self):
		return self.removeFront()
		
	def peek(self):
		return self.items[len(self.items)-1]
	
	def size(self):
		return len(self.items)

a = deqStack()
a.push(4)
a.push(5)
a.push(6)
a.push(7)
print a.peek()
print a.size()
print "-----"
print a.pop()
print a.pop()
print a.size()