1. 将DataFrame数据写入csv
(1)用 csv包一行一行的写入
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]])
(2) 用pandas
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=',')
2. 读取csv文件
(1)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
(2)用panadas
import pandas as pd
data = pd.read_csv('test.csv')