Boolean type in NumPy - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Boolean type in NumPy?

A Boolean type in NumPy represents values that can be either True or False. It is used to store truth values and is useful for filtering and conditional operations.

beginner

How do you create a NumPy array of Boolean values?

You can create a Boolean NumPy array by passing a list of True and False values to np.array(), for example: np.array([True, False, True]).

beginner

What is the data type name for Boolean arrays in NumPy?

The data type name for Boolean arrays in NumPy is 'bool' or 'bool_' which stores True or False values efficiently.

intermediate

How can Boolean arrays be used in NumPy?

Boolean arrays can be used to filter data, perform element-wise logical operations, and control flow in data processing tasks.

intermediate

What happens when you perform a logical operation between two Boolean NumPy arrays?

Performing logical operations like AND (&), OR (|), and NOT (~) between Boolean arrays results in a new Boolean array with element-wise operation results.

Which NumPy data type stores Boolean values?

A bool

B int

C float

D str

The 'bool' data type in NumPy stores Boolean values True or False.

What is the output type when you compare two NumPy arrays element-wise?

A Integer array

B String array

C Float array

D Boolean array

Element-wise comparison returns a Boolean array indicating True or False for each comparison.

Which operator is used for element-wise logical AND in NumPy Boolean arrays?

A &

B &&

C and

D |

The '&' operator performs element-wise logical AND on Boolean NumPy arrays.

How do you create a Boolean array from a condition in NumPy?

A Using np.bool_()

B Using a comparison like arr > 5

C Using np.array([True, False])

D Using np.int32()

A condition like arr > 5 returns a Boolean array where each element shows if the condition is True or False.

What does the ~ operator do on a Boolean NumPy array?

A Logical AND

B Logical OR

C Logical NOT (negation)

D No operation

The '~' operator performs element-wise logical NOT, flipping True to False and vice versa.

Explain what a Boolean type is in NumPy and how it can be used in data analysis.

Think about how True/False values help select or filter data.

Describe how to create and manipulate Boolean arrays in NumPy with examples.

Consider how conditions and logical operators work on arrays.