其實最好自己敲一遍

def?main():
????from?sklearn.datasets?import?load_iris
????iris?=?load_iris()
????print(iris)
????print(len(iris["data"]))
????from?sklearn.model_selection?import?train_test_split
????train_data,test_data,train_target,test_target=train_test_split(iris.data,iris.target,test_size=0.2,random_state=1)

????from?sklearn?import?tree
????#決策樹
????clf?=?tree.DecisionTreeClassifier(criterion="entropy")
????clf.fit(train_data,train_target)
????y_pred?=?clf.predict(test_data)

????#Verify
????from?sklearn?import?metrics
????print(metrics.accuracy_score(y_true=test_target,y_pred=y_pred))
????print(metrics.confusion_matrix(y_true=test_target,y_pred=y_pred))
????with?open("D:/test/test.xlsx","w")?as?f:
????????tree.export_graphviz(clf,out_file=f)
if?__name__=="__main__":
????main()

自己敲一遍