Question

simple PYTHON 3 language. please comment each line I want to understand. I know the picture says java but please complete code in PYTHON. please use menu driven

[E] The "back" button used in a web browser is a great example of how stacks may be used. When a user visits a new web page, the current page gets pushed onto the stack. When the user clicks the back button, the last page pushed onto the stack is popped off of the stack and loaded in the browser window. When all of the pages are popped off of the stack, the back button grays out, indicating that the stack is empty. Write a Java program to simulate this operation.

Answer 1

CODE:
stack = ["null"]  # to make a simple stack i am using a list to implement it
# and I have kept a null value which defines that the stack is empty
while True: # this loop will run until it encounters a break statement
    n = int(input("1. Open a new Website\n2. Go Back\n3. Exit")) # taking input from the user
    if n == 1: # if user wants to enter a new website then pushing into the stack as the last item
        p = input()
        stack.append(p)
    elif n == 2: # else if user wants to go back then popping the last website he browsed
        temp = stack.pop()
        if temp != "null": # and if if reaches null then it means there is no more websites to go back to
            print("Your last visit website is", temp)
        else:
            print("you are in the home page.")
    else:
        break

-3.py x ftest2.py test.py x ftest 2.py X stack = ["null"] # to make a simple stack i am using a list to implement it # and I have kept a null value which defines that the stack is empty while True: # this loop will run until it encounters a break statement n = int(input("1. Open a new Website\n2. Go Back\n3. Exit")) # taking input from the user E if n == 1: # if user wants to enter a new website then pushing into the stack as the last item p = input() stack.append(p) elif n == 2: # else if user wants to go back then popping the last website he browsed temp = stack.pop() if temp != "null": # and if if reaches null then it means there is no more websites to go back to print("Your last visit website is", temp), else: print("you are in the home page.") else: break

- U II 12 JU I LLY GIVI 1. Open a new Website 2. Go Back 3. Exit websitel.com 1. Open a new Website 2. Go Back 3. Exit website2.com 1. Open a new Website 2. Go Back 3. Exit Your last visit website is website2.com 1. Open a new Website 2. Go Back 3. Exit Your last visit website is website1.com 1. Open a new Website 2. Go Back 3. Exit you are in the home page. 1. Open a new Website 2. Go Back 3. Exit Process finished with exit code 0

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