Python, add the index into tht pd.Series of list

Question

For example, I got a pd.Series of list like below

test = pd.Series([[1, 0, 0, 0],[0, 1, 0, 0],[0, 1, 0, 0],[0, 0, 0, 1],[1, 0, 0, 0]])
print(test[0])
0    [1,