Hackerrank File I/O and Exception Handling 4

Question 1

What does the `seek(0)` method do on a file object?

Accepted Answer

Moves the file cursor to the beginning

Answer

`seek(0)` repositions the file cursor to byte offset 0, which is the start of the file.

Question 2

Which exception is raised when you try to open a file that does not exist using `open('missing.txt', 'r')`?

Accepted Answer

FileNotFoundError

Answer

`FileNotFoundError` (a subclass of `OSError`) is raised when the specified file cannot be found.

Question 3

What is the output of the following code?
```python
try:
    x = int('abc')
except ValueError as e:
    print('caught')
finally:
    print('done')
```

Accepted Answer

caught
done

Answer

The `except` block prints 'caught', then the `finally` block always executes and prints 'done'.

Question 4

Which mode string opens a binary file for both reading and writing without truncating it?

Accepted Answer

rb+

Answer

`'rb+'` opens a binary file for reading and writing while preserving existing content.

Question 5

What does `f.tell()` return?

Accepted Answer

The current position of the file cursor in bytes

Answer

`tell()` returns an integer giving the current byte position of the file cursor.

(Hackerrank) HackerRank Python Certification Practice Test

(Hackerrank) HackerRank Python Certification Practice Test

Hackerrank File I/O and Exception Handling 4