不同长度list填充0成为数组

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https://stackoverflow.com/questions/32037893/numpy-fix-array-with-rows-of-different-lengths-by-filling-the-empty-elements-wi
Sijxy=pd.DataFrame(Sijxyo);Sijxy=Sijxy.fillna(0)

np.pad(a, [(0, 1), (0, 1)], mode='constant')