leetcode python - Reverse Integer

# Reverse digits of an integer.
#
# Example1: x = 123, return 321
# Example2: x = -123, return -321
#
# click to show spoilers.
#
# Note:
# The input is assumed to be a 32-bit signed integer.
# Your function should return 0 when the reversed integer overflows.
class Solution(object):
def reverse(self, x):
"""
:type x: int
:rtype: int
"""
res = 0
flag = x < 0 and -1 or 1
x *= flag
while x != 0:
res = res * 10 + x % 10
x /= 10
if res > 2147483647:
return 0
return res * flag