def moving_average(numbers: list, window: int) -> list:
     i=0
     update=len(numbers)
     mean = []
     while True:
          n = numbers[i:i+window]
          i+=1
          INT = sum(n)/len(n)
          mean.append(INT)
          if update == i+window-1:
               return mean

print(moving_average([1, 2, 3], 2))