Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 31

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Step 31

It’s time to move some code from the move() function to the make_allowed_move() function. Move the code nested inside the first if statement (except the first print() call) to your new function. Pay close attention to the indentation. Don’t forget to remove the pass keyword.

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': []
}

# User Editable Region

def make_allowed_move(source, target):
    forward = False
    if not rods[target]:
        forward = True
    elif rods[source] and rods[source][-1] < rods[target][-1]:
        forward = True
    if forward:
        print(f'Moving disk {rods[source][-1]} from {source} to {target}')
        rods[target].append(rods[source].pop())
    else:
        print(f'Moving disk {rods[target][-1]} from {target} to {source}')
        rods[source].append(rods[target].pop())

def move(n, source, auxiliary, target):
    # display starting configuration
    print(rods)
    for i in range(n):
        remainder = (i + 1) % 3
        if remainder == 1:
            print(f'Move {i + 1} allowed between {source} and {target}')
            # display our progress
            print(rods)

# 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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Learn Recursion by Solving the Tower of Hanoi Puzzle - Step 31

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