You have a list lines = ['First\n', 'Second\n', 'Third\n']. Which code snippet efficiently appends all lines to log.txt?

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Python - File Handling Fundamentals

You have a list lines = ['First\n', 'Second\n', 'Third\n']. Which code snippet efficiently appends all lines to log.txt?

Awith open('log.txt', 'a') as f: f.writelines(lines)

Bwith open('log.txt', 'w') as f: for line in lines: f.write(line)

Cwith open('log.txt', 'r') as f: f.writelines(lines)

Dwith open('log.txt', 'a') as f: for line in lines: f.read(line)

Step-by-Step Solution

Solution:

Step 1: Append mode
Mode 'a' appends data without erasing existing content.
Step 2: Efficient writing
Using f.writelines(lines) writes all lines efficiently.
Step 3: Check other options
'w' overwrites file, 'r' mode disallows writing, f.read() is for reading.
Final Answer:
with open('log.txt', 'a') as f: f.writelines(lines) -> Option A
Quick Check:
Use 'a' mode and writelines() to append multiple lines [OK]

Quick Trick: Use 'a' mode with writelines() to append lists [OK]

Common Mistakes:

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