python - 如何在文本文件的不同行中写入每个 IP 地址？

Question

from scapy.all import *


pkts = rdpcap("lalalao.pcap")

for p in pkts:
##  print p.time


        if IP in p: #if packet has IP layer
                    src_ip = p[IP].src
                    dest_ip = p[IP].dst
                    print src_ip

                    f = open('IP_src.txt', 'a+')
                    for ip in src_ip:
                            f.writelines(ip)

                    f.close()

如何将每个ip写在文本文件的不同行中？代码无效!

Answer 1

writelines不添加换行符。

Write a list of lines to the stream. Line separators are not added, so it is usual for each of the lines provided to have a line separator at the end.

---

使用print statement (print function 在 Python 3.x 中)在字符串末尾写换行符:

with open('IP_src.txt', 'a+') as f:
    for ip in src_ip:
        print >>f, ip         # Python 2.x
        # print(ip, file=f)   # Python 3.x

或手动添加行:

with open('IP_src.txt', 'a+') as f:
    for ip in src_ip:
        f.write(ip + '\n')