❤leetcode,python2❤颠倒整数

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class Solution(object):
    def reverse(self, x):
        """
        :type x: int
        :rtype: int
        """

        if str(x)[0] == '-':
            num = int('-'+str(x)[1:][::-1])
        else :
            num = int(str(x)[::-1])

        if num>2**31-1 or num<-2**31:
            return 0
        else:
            return num