class Solution:
def reverse(self, x):
minus = (x < 0)
num = x
if minus:
num = x * (-1)
num_unit = []
while num > 0:
unit = num % 10
num_unit.append(unit)
num = num // 10result = 0
for i in range(0, len(num_unit)):
result = result + num_unit[i] * 10 ** (len(num_unit) - 1 - i)
if minus:
result = result * (-1)if result > 2**31 -1 or result < -2 ** 31:
return 0
else:
return result
