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import numpy as np#import plotlysns.set(style="white",color_codes=True)iris=load_iris()data = iris['data']target = iris['target']#用columns添加列名df = pd.DataFrame(data)print(df)df.columns = ['花萼长度','花萼宽度','花瓣长度','花瓣宽度']df.insert(4,'总类',target)#print(df)df.to_csv('a.txt',index=False)def iris_type(s):    it = {   0:'setosa',1:'versicolor',2:'virginica'}    return it[s]#data = np.loadtxt('a.txt',delimiter=' ',converters={4:iris_type})