![](/img/trans.png)
[英]How do I copy only the required rows from one csv file to other csv file using python?
[英]Get only the required lines from a csv file using python
如何使用python从csv文件中获取每个第3行?
import csv
with open ('data.csv','r') as infile:
contents = csv.reader(infile, delimiter =' ')
then???
csv文件看起来像:
aaaaaaaaaaaaaaaa
bbbbbbbbbbbbbbbb
only recquired line
cccccccccccccccccccccccccc
ddddddddddddddddddddddddd
only recquired line
结果应如下所示:
only recquired line
only recquired line
为避免将整个文件加载到内存中,可以使用itertools.islice
from itertools import islice
with open ('data.csv','r') as infile:
x = islice(infile, 2, None, 3)
for line in x:
print line
for index, line in enumerate(fileOfInterest, 1):
if index % 3 == 0:
doSomething
或者,您可以使用python的扩展切片表示法,如下所示:
for line in fileOfInterest[2::3]
doSomething
但是,1_CR的答案是我要去的那个!
with open('test.csv') as hf:
print [line for line in list(hf)[2::3]]
使用扩展切片表示法 :
for i in contents.splitlines(True)[2::3]:
print (i)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.