Stack Implementation

def push(stack, item):
    stack[0] = item

def pop(stack):
    if bool(len(stack)):
        print("Item popped : ", stack.pop(0))
    else : print("[WARNING] Underflow!!!")

def peek(stack):
    stk_len = len(stack)
    if bool(stk_len):
        for i in range(stk_len):
            if i == 0:
                print(stack[i], " <== TOP\n")
            else: print(stack[i], end="\n")
    else: print("[WARNING] Stack is EMPTY!!!")

def main():
    stack = []
    print("The Stack is Empty now..\nPlease Enter 5 items into it...")
    for i in range(5):
        inp = input("Enter an Item : ")
        stack.append(inp)
    print("[SUCCESS] 5 Items Successfully added to it.")
    print("\nPlease Enter the Operation that you want to do on it...")
    while True:
        print("\n1. Push\n2. Pop\n3. Peek\n4. Display Stack\n5. Exit")
        choice = int(input("Enter the Choice (Number only) : "))
        if choice == 1:
            item = input("Enter the Item to be pushed : ")
            push(stack, item)
            print("[SUCCESS] Item Successfully Pushed into the stack.")
        elif choice == 2 : pop(stack)
        elif choice == 3 : peek(stack)
        elif choice == 4 :
            for i in stack : print(i)
        elif choice == 5 :
            print("Exiting...")
            break
        else : print("[ERROR] Invalid Choice")
main()