Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 25

Python
1

Tell us what’s happening:

I put the “if” under the “elif” but it won’t let me continue.

I don’t know if I have something wrong with the indentation or something, but I already tried it like this and within the previous code block, and it won’t let me continue.
Please help.

Your code so far

NUMBER_OF_DISKS = 3
number_of_moves = 2**NUMBER_OF_DISKS - 1
rods = {
    'A': list(range(NUMBER_OF_DISKS, 0, -1)),
    'B': [],
    'C': []
}

def move(n, source, auxiliary, target):
    # display starting configuration
    print(rods)
    for i in range(number_of_moves):
        remainder = (i + 1) % 3

# User Editable Region

        if remainder == 1:
            print(f'Move {i + 1} allowed between {source} and {target}')
            forward = False
            if not rods[target]:
                forward = True
            elif rods[source] and rods[source][-1] < rods[target][-1]:
                forward = True
            if forward is True: 
                 print(f'Moving disk {rods[source][-1]} from {source} to {target}')

# User Editable Region

        elif remainder == 2:
            print(f'Move {i + 1} allowed between {source} and {auxiliary}')
        elif remainder == 0:
            print(f'Move {i + 1} allowed between {auxiliary} and {target}')

# initiate call from source A to target C with auxiliary B
move(NUMBER_OF_DISKS, 'A', 'B', 'C')

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Challenge Information:

Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 25

3

Hi there, welcome to the community! :waving_hand:

Great work on your code! Just a heads-up, in your if statement, you’re using the is operator, but the lesson asks for a different approach.
There are a couple of ways to resolve this:

  1. You can use a comparison operator instead of is.
  2. Or, you can check the condition without the comparison operator

Let me know if you need any more clarification! :blush: