You want to keep a log of events in a file without losing old logs. Which code snippet correctly appends new logs without overwriting existing ones?

medium🚀 Application Q15 of Q15

Python - File Reading and Writing Strategies

Awith open('log.txt', 'w') as f: f.write('New event\n')

Bwith open('log.txt', 'a') as f: f.write('New event\n')

Cwith open('log.txt', 'r') as f: f.write('New event\n')

Dwith open('log.txt', 'x') as f: f.write('New event\n')

Step-by-Step Solution

Solution:

Step 1: Understand log file needs
Logs should be added without deleting old entries, so appending is needed.
Step 2: Choose correct mode
Mode 'a' appends data; 'w' overwrites, 'r' is read-only, 'x' creates new file and errors if exists.
Final Answer:
with open('log.txt', 'a') as f: f.write('New event\n') -> Option B
Quick Check:
Append mode 'a' preserves old data [OK]

Quick Trick: Use 'a' mode to add without deleting old logs [OK]

Common Mistakes:

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