×

×

class Stack: def __init__(self): self.stack = [] def push(self, element): self.stack.append(element) def pop(self): if self.@(9): return "Stack is empty" return self.stack.pop() def peek(self): if self.@(9): return "Stack is empty" return self.stack[-1] def isEmpty(self): return len(self.stack) == 0 def size(self): return len(self.stack)

class Stack: def __init__(self): self.stack = [] def push(self, element): self.stack.append(element) def pop(self): if self.isEmpty(): return "Stack is empty" return self.stack.pop() def peek(self): if self.isEmpty(): return "Stack is empty" return self.stack[-1] def isEmpty(self): return len(self.stack) == 0 def size(self): return len(self.stack)

不正确

点击此处重新尝试。

正确！

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