Python Programing

class Stack: """ a custom stack implementation using a Python list """ def __init__(self): """ Instantiate the single field (a list) in a Stack object """ self.items = [] def isEmpty(self): """ Return a bool based on whether stack contains 1 or more (-> True) or 0 items (-> False) """ return self.items == [] def push(self, item): self.items.append(item) def pop(self): return self.items.pop() def peek(self): return self.items[len(self.items)-1] def size(self): return len(self.items)