csv文件操作

1.python2中:

import csv

infos = [
['peter','male'],
['marry','female'],
['johon','male'],
['rose','female'],
['mike','male']
]

#写入
with open('infos.csv','wb') as f:
    csvout = csv.writer(f)
    csvout.writerows(infos)

#读取
with open('infos.csv','rb') as f:
    csvin = csv.reader(f)
    data = [row for row in csvin]

with open('infos.csv','r') as f:
      csvin = csv.reader(f)
　　　 for row in csvin:
          print 'name:%s,gender:%s' %(row[0],row[1])

效果:

注意: 读取和写入都是以二进制的方式，才能保证没有空行

with open('infos.csv','wb') as f:
    csvout = csv.DictWriter(f,fieldnames=['name','gender'])
    csvout.writeheader()
    csvout.writerows(infos)

with open('infos.csv','rb') as f:
    csvin = csv.DictReader(f)
    data = [row for row in csvin]

with open('infos.csv','r') as f:
  　　csvin = csv.DictReader(f,fieldnames=['name','gender'])
  　　for row in csvin:
  　　　　print 'name:%s,gneder:%s' %(row['name'],row['gender'])

但是，在python3中writerow CSV文件多一个空行，如图：

解决方法：

打开文件时指定换行符为""(空字符)

#打开文件时候，指定换行符为""
with open('infos.csv','w',newline='') as f:
    csvout = csv.writer(f)
    csvout.writerows(infos)