Parse Logs for Frequent Errors

MediumPython

Problem

Given a large log file, write a function to parse it and return the most frequent error messages.

Accept log_lines as an iterable of strings in the format LEVEL|message, and count only ERROR entries. Return the top k messages as [message, count] pairs, ordered by descending count and then ascending message text.

Constraints

1 <= number of log lines <= 9999
Each line contains at most 1000 characters
A valid line has the form LEVEL|message
1 <= k <= 1000
Only lines with level ERROR are counted
Return at most k results

Function Signature

def most_frequent_errors(log_lines, k):

CodePython 3

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