Python Data Types and Variables 2

Question 1

What is the result of `type(3.0)` in Python?

Accepted Answer

Answer

3.0 is a floating-point literal, so its type is `float`.

Question 2

Which statement correctly creates a complex number in Python?

Accepted Answer

z = complex(2, 3)

Answer

`complex(2, 3)` creates the complex number 2+3j; Python uses `j` not `i` in literals.

Question 3

What does `bool` inherit from in Python's type hierarchy?

Accepted Answer

int

Answer

`bool` is a subclass of `int`, so `True == 1` and `False == 0`.

Question 4

What is the output of `print(type(None))`?

Accepted Answer

Answer

Python's `None` is the sole instance of the built-in `NoneType` class.

Question 5

Which of the following variable names is INVALID in Python?

Accepted Answer

2count

Answer

Variable names cannot begin with a digit; `2count` is a syntax error.

Python Practice Test