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def IsXMatrix (arrInputMatrix):
nLen = len(arrInputMatrix)
## Check
for nRowIndx in range(nLen):
nColIndx_01 = nRowIndx
nColIndx_02 = nLen - nRowIndx - 1
## 1st
if arrInputMatrix[nRowIndx][nColIndx_01] == 0:
return False
## 2nd
if arrInputMatrix[nRowIndx][nColIndx_02] == 0:
return False
## 3rd
for nColIndx in range(nLen):
if nColIndx in [nColIndx_01, nColIndx_02]:
continue
if arrInputMatrix[nRowIndx][nColIndx] != 0:
return False
return True
## arrMatrix = [[1, 0, 0, 2], [0, 3, 4, 0], [0, 5, 6, 0], [7, 0, 0, 1]] ## Example 1
## arrMatrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] ## Example 2
arrMatrix = [[1, 0, 2], [0, 3, 0], [4, 0, 5]] ## Example 3
print (IsXMatrix (arrMatrix))
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