message: Python 3 compatibility
  Hello, I found that the first method `reverse` only runs in python 2.
  I've made a python 3 compatible version under it, called reverse_py3.
  Thanks,
diff: @@ -35,6 +35,20 @@ class Solution(object):
  x /= 10
  return result if result <= 0x7fffffff else 0 # Handle overflow.
  + def reverse_py3(self, x): # Same principle as above, but python3 compatible
  + """
  + :type x: int
  + :rtype: int
  + """
  + absX = abs(x)
  + result = 0
  + while absX > 0:
  + result = result * 10 + absX % 10
  + absX //= 10
  + if x < 0:
  + result = -result
  + return result if 2147483647 > result > -2147483648 else 0
  +
  def reverse2(self, x):
  """
  :type x: int
  