Error in splitting a block of data using Python

Question

I have a parsed through a file and I need to split the data according to LogType .Below is my data:

===================================================================================
LogType:container-localizer-syslog
Log Upload Time :Thu Jun 25 12:24:45 +0100 2020
LogLength:0
Log Contents:

LogType:stderr
Log Upload Time :Thu Jun 25 12:24:52 +0100 2020
LogLength:3000
Log Contents:
20/06/25 12:19:33 INFO datasources.FileScanRDD
20/06/25 12:19:40 INFO executor.EXECUTOR: Finished task 18.0 in stage 0.0 (TID 18),18994 bytes result sent to driver.
20/06/21 12:19:40 INFO eas
20/06/25 12:20:41 WARN Warning as the node is accessed without started

===================================================================================
LogType:container-localizer-syslog
Log Upload Time :Thu Jun 25 12:24:45 +0100 2020
LogLength:0

I have applied a code which results in some error in splitting of data.Below is the code I applied:

def parse_container(text,full_text_lines,filter_log_types=None,filter_content_types=None):
    results={}

    first, rest  = text.split('\n', 1)
   #print(rest)      #rest is the block of data mentioned above
    results['id'] = first
    all_log_types = re.compile('^(?=LogType:)',flags=re.MULTILINE).split(rest)
    print(all_log_types)

The output I got:

['========================================================================\nLogType:container-
localizer-syslog\nLog Upload Time :Thu Jun 25 12:24:45 +0100 2020\nLogLength:0\nLog Contents:\n\n
LogType:stderr\nLog Upload Time :Thu Jun 25 12:24:52 +0100 2020\nLogLength:3000\nLog Contents:\n20/06/25 12:19:33 INFO datasources.FileScanRDD \n20/06/25 12:19:40 INFO executor.EXECUTOR: Finished task 18.0 in stage 0.0 (TID 18),18994 bytes result sent to driver.\n
20/06/21 12:19:40 INFO eas\n20/06/25 12:20:41 WARN Warning as the node is accessed without started\n \n']
['========================================================================\nLogType:container-
localizer-syslog\nLog Upload Time :Thu Jun 25 12:24:45 +0100 2020\nLogLength:0\nLog Contents:\n\n']

The output I need:

['========================================================================\n','LogType:contain
er-localizer-syslog\nLog Upload Time :Thu Jun 25 12:24:45 +0100 2020\nLogLength:0\nLog Contents:\n\n', 
 'LogType:stderr\nLog Upload Time :Thu Jun 25 12:24:52 +0100 2020\nLogLength:3000\nLog Contents:\n20/06/25 12:19:33 INFO datasources.FileScanRDD \n20/06/25 12:19:40 INFO executor.EXECUTOR: Finished task 18.0 in stage 0.0 (TID 18),18994 bytes result sent to driver.\n20/06/21 12:19:40 INFO eas\n20/06/25 12:20:41 WARN Warning as the node is accessed without started\n \n']

['========================================================================\n','LogType:contain
    er-localizer-syslog\nLog Upload Time :Thu Jun 25 12:24:45 +0100 2020\nLogLength:0\nLog Contents:\n\n']

In my output you can see I am getting \n at the beginning of LogType but I need to split according to the LogType by comma.

In the expected output you can see that the data has been split according LogType by ,

I am using Python 2.6.6 . Please help me to solve this issue . Thanks a lot!

Answer 1

We could easily split the logs using regular expressions in python. The following code splits the logs by an or of two conditions.

Condition1: Multiple occurrences of = followed by a \n

Condition2: 2 occurrences of \n

If any of the conditions is satisfied, we get the output. filter will remove any empty strings returned by the split and return an object. This object is then converted to a list.

import re

text = """===================================================================================
LogType:container-localizer-syslog
Log Upload Time :Thu Jun 25 12:24:45 +0100 2020
LogLength:0
Log Contents:

LogType:stderr
Log Upload Time :Thu Jun 25 12:24:52 +0100 2020
LogLength:3000
Log Contents:
20/06/25 12:19:33 INFO datasources.FileScanRDD
20/06/25 12:19:40 INFO executor.EXECUTOR: Finished task 18.0 in stage 0.0 (TID 18),18994 bytes result sent to driver.
20/06/21 12:19:40 INFO eas
20/06/25 12:20:41 WARN Warning as the node is accessed without started

===================================================================================
LogType:container-localizer-syslog
Log Upload Time :Thu Jun 25 12:24:45 +0100 2020
LogLength:0
"""


output = list(filter(None, re.compile('[=]+.\n|\n\n').split(text)))

print(output)

OUTPUT:

['LogType:container-localizer-syslog\nLog Upload Time :Thu Jun 25 12:24:45 +0100 2020\nLogLength:0\nLog Contents:', 'LogType:stderr\nLog Upload Time :Thu Jun 25 12:24:52 +0100 2020\nLogLength:3000\nLog Contents:\n20/06/25 12:19:33 INFO datasources.FileScanRDD\n20/06/25 12:19:40 INFO executor.EXECUTOR: Finished task 18.0 in stage 0.0 (TID 18),18994 bytes result sent to driver.\n20/06/21 12:19:40 INFO eas\n20/06/25 12:20:41 WARN Warning as the node is accessed without started', 'LogType:container-localizer-syslog\nLog Upload Time :Thu Jun 25 12:24:45 +0100 2020\nLogLength:0\n']