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,不熟悉处理方法可以参考pandas十分钟入门


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