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I don't know why it says: IndentationError: unindent does not match any outer indentation level
AmazingCoderE (0)

I can't figure out why it is wrong. Pls help ASAP.

ruiwenge2 (564)

I’ve had that problem before. You have to re-indent everything

ch1ck3n (2048)
board = [
 ['-' ,'-' ,'-' ],
 ['-' ,'-' ,'-' ],
 ['-' ,'-' ,'-']
def print_board (board):
  for row in board:
    for slot in row:
      print(f"{slot} ", end="")
def quit(user_input):
  if user_input.lower() == "q":
    print("Thanks for playing!")
    return True
    return False
def check_input(user_input):
  if not isnum(user_input): return False
  user_input = int(user_input)
  if not bounds(user_input):return False
  return True
def isnum(user_input):
 if not user_input.isnumeric():
   print("Please enter a valid number.")
   return False
   return True
def bounds(user_input):
  if user_input > 9 or user_input < 1:
   print("This number is out of bounds!")
   return False

def istaken(coords, board):
  row = coords[0]
  col = coords[1]
  if board[row][col] != "-":
    print("This position is already taken.")
    return True
  else: return False

def coordinates(user_input):
  row = int(user_input / 3)
  col = user_input
  if col > 2: col = int(col % 3)
  return (row, col)
while True:
  print_board (board)
  user_input = input("Please enter a position 1 through 9 or enter \"q\" to quit:")
  if quit(user_input):break
  if not check_input(user_input):
    print("Please try again.")
  user_input = int(user_input) - 1
  coords = coordinates(user_input)
  if istaken(coords, board):
    print("Please try again.")

copy paste that code into your code

hope it works!