最常用的一种方法,利用pandas包
import pandas as pd #任意的多组列表 a = [1,2,3] b = [4,5,6] #字典中的key值即为csv中列名 dataframe = pd.DataFrame({'a_name':a,'b_name':b}) #将DataFrame存储为csv,index表示是否显示行名,default=True dataframe.to_csv("test.csv",index=False,sep=',')a_name b_name 0 1 4 1 2 5 2 3 6
同样pandas也提供简单的读csv方法
import pandas as pd data = pd.read_csv('test.csv')
会得到一个DataFrame类型的data
另一种方法用csv包,一行一行写入
import csv #python2可以用file替代open with open("test.csv","w") as csvfile: writer = csv.writer(csvfile) #先写入columns_name writer.writerow(["index","a_name","b_name"]) #写入多行用writerows writer.writerows([[0,1,3],[1,2,3],[2,3,4]])index a_name b_name 0 1 3 1 2 3 2 3 4
读取csv文件用reader
import csv with open("test.csv","r") as csvfile: reader = csv.reader(csvfile) #这里不需要readlines for line in reader: print line
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