Bugl — code interview practice that feels like a game

Loading lesson path

Flash cards

Review the key moves

1/4

Core idea

What is the main idea behind Python None?

Lesson checks

Short Mimo-style checks built from this lesson's code, terms, and sequence.

1Quick choice

Which statement best captures the main point of this lesson?

2Order

Put the learning moves in the order that makes the concept easiest to apply.

Its data type is NoneType , and None is the only instance of a NoneType object.

None is a special constant in Python that represents the absence of a value.

Functions returning None

None is a special constant in Python that represents the absence of a value.

Its data type is NoneType , and None is the only instance of a NoneType object.

Variables can be assigned None to indicate "no value" or "not set".

None

Use type() to see the type of a None value.

None

To compare a value to None , use the identity operator is or is not

is

is not

None evaluates to False in a boolean context.

Example

print(bool(None))

Functions that do not explicitly return a value return None by default.

None