curriculum/challenges/english/blocks/learn-recursion-by-solving-the-tower-of-hanoi-puzzle/64dceadec3c9cf2ca7b56de6.md
Next, below the nested elif statement, add another if statement that should be executed when forward is True. Inside this conditional, print the following f-string: f'Moving disk {rods[source][-1]} from {source} to {target}'.
You should add an if statement to execute when forward is True after the elif block.
({ test: () => assert.match(code, /^\s{12}if\s+forward(\s*==\s*True)?\s*:/m) })
You should print the provide string inside your new if statement.
({ test: () => assert.match(code, /if\s+forward(\s*==\s*True)?\s*:\s+print\s*\(\s*f('|")Moving\sdisk\s\{\s*rods\s*\[\s*source\s*\]\s*\[\s*-\s*1\s*\]\s*\}\sfrom\s\{\s*source\s*\}\sto\s\{\s*target\s*\}\2\s*\)/) })
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
--fcc-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
--fcc-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')