007_Reverse_Integer.py

class Solution:
    def reverse(self, x: int) -> int:
        isNegative = x < 0
        x = abs(x)
        reversed = 0        
        
        while x != 0:
            reversed = reversed * 10 + x % 10
            x //= 10
        
        if reversed > 2**31 - 1:
            return 0
        else:
            return reversed if not isNegative else -reversed