# Overview
An ``array`` is a collection of multiple elements of the same datatype.

The ``itemsize`` function is simply used to check for the length in bytes of one array item in the internal representation.

# Syntax
```python
array.itemsize
```
# Parameters
The ``itemsize`` function does not take in any parameters.

# Return value
The ``itemsize`` function returns the length in bytes of one array item in the internal representation of the given array.

# Code

Run the code below and see how the `itemsize` function works.


# importing the array module
import array as arr

# creating an integer data type array
x = arr.array('i', [1,2,3,4,5,6,7])

# using itemsize function 
print(x.itemsize)

What is the array itemsize function in Python? 

An array's `itemsize` function returns the length in bytes of one array item.