Hackerrank File I/O and Exception Handling 5

Question 1

What is the correct way to raise a custom exception with a message in Python?

Accepted Answer

raise Exception('msg')

Answer

raise Exception.new('msg')

Answer

throw Exception('msg')

Answer

error Exception('msg')

Question 2

Given `with open('data.txt', 'w') as f: f.write('hello')`, what is the state of the file after the `with` block exits normally?

Accepted Answer

The file is closed and contains 'hello'

Answer

The file is deleted

Answer

The file is still open and writable

Answer

The file is closed and empty because write buffers are discarded

Question 3

Which exception class should a custom exception inherit from to be considered a user-defined application error?

Accepted Answer

Exception

Answer

BaseException

Answer

RuntimeError

Answer

StandardError

Question 4

What does the `truncate(size)` method do when called on a writable file object?

Accepted Answer

Resizes the file to at most `size` bytes

Answer

Deletes the file from disk

Answer

Moves the cursor to position `size`

Answer

Reads `size` bytes and discards them

Question 5

What will the following code print?
```python
try:
    raise ValueError('oops')
except TypeError:
    print('type')
except ValueError:
    print('value')
```

Accepted Answer

value

Answer

type

Answer

oops

Answer

type
value

Question 6

When writing to a file opened with mode `'a'`, where does the write pointer start?

Accepted Answer

At the end of the file

Answer

At the beginning of the file

Answer

At the position of the last read

Answer

At a position specified by seek()

Question 7

Which statement about exception chaining using `raise NewError() from original_error` is correct?

Accepted Answer

It stores the original exception in `__cause__` and sets `__suppress_context__` to True

Answer

It suppresses the original exception entirely

Answer

It re-raises the original exception unchanged

Answer

It logs the original exception to stderr automatically