[Solved] What will be the output of this code?with open('test.txt', 'w') as f: f.write('Hello') print(f.closed) | Python

Python - Context Managers

What will be the output of this code?

with open('test.txt', 'w') as f:
    f.write('Hello')
print(f.closed)

AError: f is not defined

BFalse

CHello

DTrue

Step-by-Step Solution

Solution:

Step 1: Understand the with block effect
The file is opened and written inside the with block, which automatically closes the file after the block ends.
Step 2: Check the f.closed property after block
After the block, the variable f is out of scope and not defined, so accessing f.closed raises a NameError.
Final Answer:
Error: f is not defined -> Option A
Quick Check:
Variable f is local to with block, so f.closed access outside causes error [OK]

Quick Trick: f is only defined inside with block; outside it is undefined [OK]

Common Mistakes:

MISTAKES

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