Python Dev & SWE Practice Test

1What is the primary difference between a Python list and a tuple?

Lists can store mixed data types, tuples cannot.

Tuples use square brackets [], lists use parentheses ().

Lists are mutable (changeable), tuples are immutable (unchangeable).

Lists are faster for iteration than tuples.

2What will the following Python code print?

my_dict = {'a': 1, 'b': 2, 'c': 3}
print(my_dict.get('d', 0))

KeyError

None

False

3Which of the following is used to define a block of code (like in a function or loop) in Python?

Curly braces {}

Parentheses ()

Semicolons ;

Indentation (spaces or tabs)

4What is the purpose of the `init` method in a Python class?

It's the constructor, used to initialize object attributes when an object is created.

It defines how the object should be represented as a string.

It's called automatically when the object is destroyed (garbage collected).

It's used for inheriting methods from a parent class.

5How do you open a file named `data.txt` in Python for reading its content?

`file = open("data.txt", "w")`

`file = open("data.txt", "a")`

`with open("data.txt", "r") as file:`

`read("data.txt")`

6What does the `*args` syntax in a Python function definition allow?

Passing keyword arguments only.

Passing a variable number of positional arguments.

Defining default argument values.

Specifying the return type of the function.

7Which of the following is NOT a standard Python built-in data type?

int

dict

list

array (standard arrays are typically from the `array` module or NumPy)

8What is the output of `list(range(1, 5))`?

[1, 2, 3, 4]

[1, 2, 3, 4, 5]

[0, 1, 2, 3, 4]

(1, 2, 3, 4)

9What is the primary function of a `virtual environment` in Python development?

To automatically format Python code according to PEP 8.

To speed up the execution of Python scripts.

To isolate project dependencies and avoid conflicts between different projects.

To provide an interactive Python shell (REPL).

10Which keyword is used to handle potential errors in a block of Python code?

`catch`

`try` / `except`

`if error`

`handle`

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