我正在写一个函数,它接受一个文件更新.txt作为输入。文件如下所示:
---------------------------------------------------
MRT Header
Timestamp: 1453939200(2016-01-28 01:00:00)
Type: 16(BGP4MP)
Subtype: 4(BGP4MP_MESSAGE_AS4)
Length: 39
BGP4MP_MESSAGE_AS4
Peer AS Number: 37989
Local AS Number: 12654
Interface Index: 0
Address Family: 1(IPv4)
Peer IP Address: 203.123.48.6
Local IP Address: 193.0.4.28
BGP Message
Marker: -- ignored --
Length: 19
Type: 4(KEEPALIVE)
---------------------------------------------------
MRT Header
Timestamp: 1453939200(2016-01-28 01:00:00)
Type: 16(BGP4MP)
Subtype: 4(BGP4MP_MESSAGE_AS4)
Length: 118
BGP4MP_MESSAGE_AS4
Peer AS Number: 1836
Local AS Number: 12654
Interface Index: 0
Address Family: 1(IPv4)
Peer IP Address: 146.228.1.3
Local IP Address: 193.0.4.28
BGP Message
Marker: -- ignored --
Length: 98
Type: 2(UPDATE)
Withdrawn Routes Length: 0
Total Path Attribute Length: 71
Path Attribute Flags/Type/Length: 0x40/1/1
ORIGIN: 0(IGP)
Path Attribute Flags/Type/Length: 0x40/2/42
AS_PATH
Path Segment Type: 2(AS_SEQUENCE)
Path Segment Length: 10
Path Segment Value: 1836 174 6453 37282 37088 37629 37629 37629 37629 37629
Path Attribute Flags/Type/Length: 0x40/3/4
NEXT_HOP: 146.228.1.3
Path Attribute Flags/Type/Length: 0xc0/8/12
COMMUNITY: 1836:110 1836:6000 1836:6031
NLRI: 154.65.7.0/24
---------------------------------------------------
文件是一个“块”序列。每个块都用虚线括起来
---------------------------------------------------
# Block (n)
---------------------------------------------------
# Block (n+1)
---------------------------------------------------
# Block (n+2) , etc
我想逐块读取整个文件,并返回一个只包含以下字段行的文本文件:Timestamp、Peer AS number、Local AS number、Peer IP Address、Local IP Address。你知道吗
生成的.txt文件应如下所示:
---------------------------------------------------
MRT Header
Timestamp: 1453939200(2016-01-28 01:00:00)
BGP4MP_MESSAGE_AS4
Peer AS Number: 37989
Local AS Number: 12654
Peer IP Address: 203.123.48.6
Local IP Address: 193.0.4.28
---------------------------------------------------
MRT Header
Timestamp: 1453939200(2016-01-28 01:00:00)
BGP4MP_MESSAGE_AS4
Peer AS Number: 1836
Local AS Number: 12654
Peer IP Address: 203.123.48.6
Local IP Address: 193.0.4.28
---------------------------------------------------
理想情况下,我想覆盖更新.txt用新的文本文件不要浪费空间,并将其保存在新的目录“解析更新”。你知道吗
我知道它是最小的,因为我被一行破折号分隔符困住了,但我的代码如下所示:
import sys
import os
def parser(filename):
info = open(filename, 'r+')
info.read()
#Here comes the string manipulation code
#info.split( '---------------------------------------------------')
info.close()
print 'The file has been parsed successfully !!'
def main():
parser('updates.txt')
if __name__=='__main__':
main()
在这种特定情况下,在解析之前甚至不需要将块分解为单独的部分。你可以一行一行地检查与你想要的信息类型的匹配。你知道吗
结果文件如下:
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