Clean-up with a context manager

Write a Python program showing that a with block closes a file even when an error happens inside it.

caught: something failed
file closed: True

Approach

1. Raise inside the with and check f.closed afterwards.

Solution

try:    with open("demo.txt", "w") as f:        f.write("data")        raise RuntimeError("something failed")except RuntimeError as e:    print("caught:", e)print("file closed:", f.closed)

caught: something failed
file closed: True

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