Python对txt、csv文件读写数据

1、txt 文件读写
# -*- coding:utf-8 -*-
file = open('file.txt','r')
# 获取所有的信息
print file.read()
print file.write("你好")
# 获取所有并且在所有行存在一个数组
print file.readlines()
# 获取第一行
print file.readline()

2、# 读取csv文件
# -*- coding:utf-8 -*-
import csv
writer = csv.writer(open('test.csv','wb'))
writer.writerow(['col1','col2','col3'])
data = [range(3) for i in range(3)]
for item in data:
    writer.writerow(item)
filelist = csv.reader(open('./test.csv','r'))
for item in filelist:
    print item