ValueError: Expected 2D array, got 1D array instead: 的解决办法

在学knn最邻近分类时，原始数据根据参数Q1、Q2分为type=T1、type=T2两种；
执行

knn = neighbors.KNeighborsClassifier()
knn.fit(df[['Q1','Q2']],df['type'])
knn.predict([35,26])

报错

ValueError: Expected 2D array, got 1D array instead:
array=[35 26].
Reshape your data either using array.reshape(-1, 1) if your data has a single feature or array.reshape(1, -1) if it contains a single sample.

在尝试了

np.array([35,26]).reshape(1,-1)

结果为

之后，了解到把一维数组改为二维数组只要外层加一个[]就可以了，可以省去reshape。

最终代码

knn = neighbors.KNeighborsClassifier()
knn.fit(df[['Q1','Q2']],df['type'])
knn.predict([[35,26]])

运行结果

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