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leetcode7 Reverse Integer

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

參考 https://blog.csdn.net/gui951753/article/details/81939004