1.    def pop(self, element, underflow):
2.        if self.isEmpty() is True:
3.            underflow = True
4.        else:
5.            underflow = False
6.            element = self.myTop.info
7.            ptr = self.myTop
8.            self.myTop = self.myTop.next
9.            del ptr
10.           self.size -= 1
11.       return element, underflow