python3:
class Solution:
def reverse(self, x):
"""
:type x: int
:rtype: int
"""
res = int(str(abs(x))[::-1])
if res.bit_length()>31:
return 0
else:
return res if x>0 else -res
参考 https://blog.csdn.net/gui951753/article/details/81939004