python将列表写入csv_如何用python把list里的数据写入csv？

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最常2113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5261的key值即为csv中列4102名dataframe = pd.DataFrame({'a_name':a,'b_name':b})#将DataFrame存储为csv,index表示是否显1653示行名，default=Truedataframe.to_csv("test.csv",index=False,sep=',')1234567891011

a_name b_name0 1 41 2 52 3 6

同样pandas也提供简单的读csv方法，

import pandas as pddata = pd.read_csv('test.csv')12

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]])12345678910

index a_name b_name0 1 31 2 32 3 41234

读取csv文件用reader

import csvwith open("test.csv","r") as csvfile:

reader = csv.reader(csvfile) #这里不需要readlines

for line in reader:

print line