You need to process a huge log file and write only lines containing the word 'ERROR' to a new file. Which approach is best to handle this efficiently?

hard📝 Application Q15 of 15

Python - File Reading and Writing Strategies

ARead entire file into memory, filter lines, then write all at once

BUse <code>readlines()</code> to get all lines, then write filtered lines

COpen output file in read mode and append lines

DRead file line by line, write matching lines immediately to output file

Step-by-Step Solution

Solution:

Step 1: Avoid loading entire file into memory
Reading whole file at once uses too much memory for huge files.
Step 2: Process line by line and write incrementally
Reading each line and writing matching lines immediately saves memory and is efficient.
Final Answer:
Read file line by line, write matching lines immediately to output file -> Option D
Quick Check:
Line-by-line processing + incremental write = efficient [OK]

Quick Trick: Filter and write lines one by one to save memory [OK]

Common Mistakes:

Loading entire file into memory
Using wrong file mode for output
Appending to output file opened in read mode

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More Python Quizzes

You need to process a huge log file and write only lines containing the word 'ERROR' to a new file. Which approach is best to handle this efficiently?

Step 1: Avoid loading entire file into memory

Step 2: Process line by line and write incrementally

Final Answer:

Quick Check:

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