class Stack: def __init__(self): self.stack = [] def add(self, dataval): # Use list append method to add element if dataval not in self.stack: self.stack.append(dataval) return True else: return False # Use peek to look at the top of the stack def peek(self): return self.stack[-1] AStack = Stack() AStack.add("Mon") AStack.add("Tue") AStack.peek() print(AStack.peek()) AStack.add("Wed") AStack.add("Thu") print(AStack.peek())
class Stack: def __init__(self): self.stack = [] def add(self, dataval): # Use list append method to add element if dataval not in self.stack: self.stack.append(dataval) return True else: return False # Use peek to look at the top of the stack def peek(self): return self.stack[-1] AStack = Stack() AStack.add("Mon") AStack.add("Tue") AStack.peek() print(AStack.peek()) AStack.add("Wed") AStack.add("Thu") print(AStack.peek())