stack.py

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

 def is_empty(self):
 return len(self.items) == 0

 def push(self, item):
 self.items.append(item)

 def pop(self):
 if not self.is_empty():
 return self.items.pop()
 else:
 print("Stack is empty")
 return None

 def peek(self):
 if not self.is_empty():
 return self.items[-1]
 else:
 print("Stack is empty")
 return None

 def size(self):
 return len(self.items)

# Create a stack object
stack = Stack()

# Main loop for stack operations
while True:
 print("\nSelect operation:")
 print("1. Push")
 print("2. Pop")
 print("3. Show elements")
 print("4. Empty the stack")
 print("5. Exit")

 choice = input("Enter your choice (1-5): ")

 if choice == '1':
 item = input("\nEnter element to push: ")
 stack.push(item)
 print("Element pushed onto the stack:", item)
 elif choice == '2':
 popped_item = stack.pop()
 if popped_item is not None:
 print("Popped element from the stack:", popped_item)
 elif choice == '3':
 print("\nElements in STACK:", stack.items)
 elif choice == '4':
 stack.items = []
 print("\nStack emptied")
 elif choice == '5':
 print("\nExiting program")
 break
 else:
 print("\nInvalid choice. Please enter a number from 1 to 5.")