np.piecewise(matrix, cond_list, value_list)

ValueError: with 1 condition(s), either 1 or 2 functions are expected

matrix需要改为numpy.array，类型为object

new_data = np.array(column_data).astype('object')

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Numpy piecewise报错

np.piecewise(matrix, cond_list, value_list)

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