Stack - implementacija

class Stack:
    def __init__(self):
        self._stek = []

    def isEmpty(self):
        if len(self._stek) != 0:
            return False
        return True

    def push(self, element):
        self._stek.append(element)

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

    def top(self):
        return self._stek[-1]

    def prikazi(self):
        for i in self._stek:
            print str(i) + " ",
        print

    def __len__(self):
        return len(self._stek)