Log Parsing for Errors | Dataford Interview Questions

Write a basic script to parse a log file and count the number of specific error messages.

Implement count_error_messages(log_text, error_messages), where log_text is a string containing the file contents and error_messages is a list of distinct strings. Return a dictionary mapping each requested message to its number of non-overlapping occurrences in the complete log text. A message may occur multiple times on one line, and messages with no matches must still appear with count 0.

Constraints

0 <= len(log_text) <= 100000
0 <= len(error_messages) <= 100
Each error message is a distinct non-empty string
Count occurrences as non-overlapping substring matches
Return every requested error message in the result

Function Signature

def count_error_messages(log_text, error_messages):

Your question is Log Parsing for Errors. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Write a basic script to parse a log file and count the number of specific error messages.

Constraints

0 <= len(log_text) <= 100000
0 <= len(error_messages) <= 100
Each error message is a distinct non-empty string
Count occurrences as non-overlapping substring matches
Return every requested error message in the result

Function Signature

def count_error_messages(log_text, error_messages):

Your question is Log Parsing for Errors. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.