features = [1,2,3,4]
retDataSet=[]
reducedFeatVec=features[:0]
print(reducedFeatVec)
reducedFeatVec.extend(features[1:]) #从1开始往 后加进来
print(reducedFeatVec)
retDataSet.append(reducedFeatVec) #变为向量
print(retDataSet)
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