You was very close, first to_frame and then transpose by T : s = pd.Series([1159730, 1], index=['product_id_y','count'], name=6159402) print ... ... <看更多>

I checked both x_train and x_test are pandas.core.frame.DataFrame while y_train and y_test are numpy.ndarray. I do not know where is the problem ... ... <看更多>

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Thus, before we go any further, let's introduce these three fundamental Pandas data structures: the Series , DataFrame , and Index . We will start our code ... ... <看更多>