import csv#python2可以用file替代openwith open("test.csv","w") as csvfile:writer = csv.writer(csvfile)#先写入columns_namewriter.writerow(["index","a_name","b_name"])#写入多行用writerowswriter.writerows([[0,1,3],[1,2,3],[2,3,4]])12345678910index a_name b_nam...
如何用python把list里的数据写入csv？
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=Truedataframe.to_csv("test.csv",index=False,sep=',')1234567891011a_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openwith open("test.csv","w") as csvfile:writer = csv.writer(csvfile)#先写入columns_namewriter.writerow(["index","a_name","b_name"])#写入多行用writerowswriter.writerows([[0,1,3],[1,2,3],[2,3,4]])12345678910index 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readlinesfor line in reader:print line
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