Python Exception Handling 4

Question 1

In a context manager using `__exit__`, what should the method return to suppress an exception?

Accepted Answer

True

Answer

Returning `True` from `__exit__` tells Python to suppress the exception; any falsy return value lets the exception propagate.

Question 2

What does `contextlib.suppress(FileNotFoundError)` do?

Accepted Answer

Suppresses FileNotFoundError if it occurs in the with block

Answer

`contextlib.suppress` is a context manager that silently swallows the specified exception types without any extra code.

Question 3

Which exception is raised by `assert x > 0` when x is -1?

Accepted Answer

AssertionError

Answer

`assert` raises `AssertionError` when its condition evaluates to `False`.

Question 4

What is the effect of running Python with the `-O` (optimize) flag on `assert` statements?

Accepted Answer

They are completely removed and never execute

Answer

With `-O`, Python strips all `assert` statements from the bytecode, so they never execute regardless of the condition.

Question 5

What is `ExceptionGroup` introduced in Python 3.11 used for?

Accepted Answer

Raising multiple unrelated exceptions simultaneously

Answer

`ExceptionGroup` allows raising and handling multiple concurrent exceptions at once, primarily useful in async/concurrent code.

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