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    my solution for this Question:

    def hourglassSum(arr):
        
        result=None
        n=len(arr)-2
        for i in range(n):
            for j in range(n):
                hrglass_sum=arr[i][j]+arr[i][j+1]+arr[i][j+2]+arr[i+1][j+1]+arr[i+2][j]+arr[i+2][j+1]+arr[i+2][j+2]
                if result is None:
                    result=hrglass_sum
                
                elif hrglass_sum>result:
                    result=hrglass_sum
        return result