if pandas.DataFrame 是不可以的 只有转为values.tolist(0才可以
pd.DataFrame([[]]).values.tolist() # [[]]
array([], shape=(1, 0), dtype=float64)In
与 下面的不一样
pd.DataFrame([]).values.tolist() # []
pd.DataFrame().values.tolist() # []
array([], shape=(0, 0), dtype=float64)In
不一样
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