How to count elements of an array in Python

To count the elements of an array in Python, use the size method of the numpy module

x.size

The object x is an array, matrix or vector, created using numpy's array () function.

The size method returns the length of array.

Note. The size method can also be called as a size(x) function by specifying the array object in parentheses.

Example

Example 1

Create a 3-row, 3-column array using numpy's array() function.

>>> from numpy import array
>>> matrix=array([[0,0,0],[0,0,0],[0,0,0]])

Count the elements of the array with the size method

>>> matrix.size

The size method returns the number of elements as output

9

The matrix has nine elements.

Example 2

The same result is obtained using size function

>>> from numpy import size
>>> size(matrix)

The function calculates the length of the array

9

The matrix has nine elements.