Python get from array

Python Arrays

Note: Python does not have built-in support for Arrays, but Python Lists can be used instead.

Arrays

Note: This page shows you how to use LISTS as ARRAYS, however, to work with arrays in Python you will have to import a library, like the NumPy library.

Arrays are used to store multiple values in one single variable:

Example

Create an array containing car names:

What is an Array?

An array is a special variable, which can hold more than one value at a time.

If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this:

However, what if you want to loop through the cars and find a specific one? And what if you had not 3 cars, but 300?

An array can hold many values under a single name, and you can access the values by referring to an index number.

Access the Elements of an Array

You refer to an array element by referring to the index number.

Example

Get the value of the first array item:

Example

Modify the value of the first array item:

The Length of an Array

Use the len() method to return the length of an array (the number of elements in an array).

Example

Return the number of elements in the cars array:

Note: The length of an array is always one more than the highest array index.

Looping Array Elements

You can use the for in loop to loop through all the elements of an array.

Example

Print each item in the cars array:

Adding Array Elements

You can use the append() method to add an element to an array.

Example

Add one more element to the cars array:

Removing Array Elements

You can use the pop() method to remove an element from the array.

Example

Delete the second element of the cars array:

You can also use the remove() method to remove an element from the array.

Example

Delete the element that has the value «Volvo»:

Note: The list’s remove() method only removes the first occurrence of the specified value.

Array Methods

Python has a set of built-in methods that you can use on lists/arrays.

Note: Python does not have built-in support for Arrays, but Python Lists can be used instead.

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How to access elements from an array in Python

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Overview

An array in Python is used to store multiple values or items or elements of the same type in a single variable.

We can access elements of an array using the index operator [] . All you need do in order to access a particular element is to call the array you created. Beside the array is the index [] operator, which will have the value of the particular element’s index position from a given array.

Note that the value you pass into the index operator (the index position of the element you wish to access) must be an integer.

Example

# importing the array module
import array as arr
 
# creating an integer datatype array
x = arr.array('i', [1,2,3,4,5,6,7])
 
# to access the index 3 element
 
print('The element in the index 3 of the array is: ', x[3])
 
# creating a float datatype array]
y = arr.array('d', [1.5, 2.7, 3.5, 8.2, 6.9])
 
# to access the index 0 or the first element of the array
print('The element of the array in the index 0 of the float array is: ', y[0])

It is worth noting that in Python, the first character of a list, string, array etc., is of index 0 .

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