#1

Hello again. it is look like correct?
30.If the user moves a disk to an empty stack or moves a disk onto a larger disk, that’s a valid move.
In the inner `while` loop, create an `elif` statement that checks if EITHER of the following is `True` :

``````stacks = []
left_stack = Stack("Left")
middle_stack = Stack("Middle")
right_stack = Stack("Right")
stacks.append(left_stack)
stacks.append(middle_stack)
stacks.append(right_stack)
#Set up the Game
num_disks = int(input("\nHow many disks do you want to play with?\n"))
while num_disks < 3:
num_disks = int(input("Enter a number greater than or equal to 3\n"))
for i in range(num_disks,0,-1):
left_stack.push(i)
num_optimal_moves = 2**num_disks-1
print("\nThe fastest you can solve this game is in {} moves".format(num_optimal_moves))
#Get User Input

def get_input():
choices = [stack.get_name()[0] for stack in stacks]
while True:
for i in range(len(stacks)):
name = stacks[i].get_name()
letter = choices[i]
print("Enter {} for {}".format(letter, name))
user_input = input("")
if user_input is choices:
for i in range(len(stacks)):
if user_input == choices[i]:
return stacks[i]
#Play the Game
num_user_moves = 0
while right_stack.get_size() != num_disks:
print("\n\n\n...Current Sacks...")
while True:
print("\nWich stack do you want to move from?\n")
from_stack = get_input()
print("\nWich stack do you want to move to?\n")
to_stack = get_input()
if from_stack.get_size()==0:
print("\n\nInvalid Move. Try Again")
elif to_stack.get_size()==0 or from_stack.peek() < to_stack.peek():
disk = from_stack.pop()
to_stack.push(disk)
num_user_moves +=1
break
else:
print("\n\nInvalid Move. Try Again")
for i in stacks:
i.print_items()
print("\n\nYou completed the game in {} moves, and the optimal number of moves is {}".format(num_user_moves, num_optimal_moves))
``````

How I can compare value of disks? what attribute or method I should use(peek)? : The “peeked” value of the `from_stack` is less than the “peeked” of the `to_stack`

#2

Hi @ihorivanii,

What is the purpose of this statement in the `get_input()` function, and does it serve that purpose correctly?

``````    if user_input is choices:
``````

Yes, use the `peek()` method, as you are doing.