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reverseInteger.py

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import unittest

class Solution:

def reverse(self, x: int) -> int:

result = -int(str(x)[1:][::-1]) if x < 0 else int(str(x)[::-1])

if -2**31 <= result <= (2**31)-1:

return result

return 0

class Test(unittest.TestCase):

def test_reverse(self):

solution = Solution()

self.assertEqual(solution.reverse(123), 321)

self.assertEqual(solution.reverse(-123), -321)

self.assertEqual(solution.reverse(120), 21)

self.assertEqual(solution.reverse(0), 0)

if __name__ == '__main__':

unittest.main()