Python Python 3

Question 1

What is the purpose of the `__init__` method in a Python class?

Accepted Answer

Initialize a new object's attributes

Answer

`__init__` is the constructor that runs automatically when a new instance is created, setting initial attribute values.

Question 2

What does `dict.get('key', 'default')` return if 'key' is not in the dictionary?

Accepted Answer

'default'

Answer

`dict.get(key, default)` returns the default value instead of raising a KeyError when the key is missing.

Question 3

Which Python built-in function returns the length of an object?

Accepted Answer

len()

Answer

`len()` returns the number of items in a sequence, collection, or other container object.

Question 4

What does a `try/except/finally` block guarantee about the `finally` clause?

Accepted Answer

It always runs regardless of exceptions

Answer

The `finally` block always executes whether an exception was raised or not, making it ideal for cleanup.

Question 5

What is the result of `'hello'[::-1]` in Python?

Accepted Answer

'olleh'

Answer

The slice `[::-1]` reverses the string by stepping backward through all characters.

Python Practice Test