[Solved] What will this code print if 'data.txt' contains:\n123\n456\n789\n?with open('data.txt') as file: lines = file.readlines() print(len(lines)) | Python

Python - File Reading and Writing Strategies

What will this code print if 'data.txt' contains:\n123\n456\n789\n?

with open('data.txt') as file:
    lines = file.readlines()
    print(len(lines))

A3

B1

C0

DError

Step-by-Step Solution

Solution:

Step 1: Use readlines() to get all lines
readlines() returns a list with one element per line.
Step 2: Count number of lines with len()
There are 3 lines, so len(lines) is 3.
Final Answer:
3 -> Option A
Quick Check:
readlines() list length = number of lines = A [OK]

Quick Trick: readlines() returns list; len() counts lines [OK]

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What will this code print if 'data.txt' contains:\n123\n456\n789\n?