Python Array index() Method

The Python arrayindex() method returns smallest index value of the first occurrence of element in an array.

Syntax

Following is the syntax of the Python arrayindex method −

array_name.index(element, start, stop)

Parameters

This method accepts following parameters.

• element : It can be int, float, string, double etc.
• start(optional) : start searching an element from that particular index.
• stop(optional) : stop searching an element at that particula index.

Example 1

Following is the basic example of Python arrayindex method −

import array as arr my_arr1 = arr.array('i',[13,32,52,22,3,10,22,45,39,22])x = 22index  =my_arr1.index(x)print("The index of the element",x,":",index)

Output

Following is the output of the above code −

The index of the element 22 : 3

Example 2

In this method, we can search the element with in the range of index following is the example −

import array as arrmy_arr2 = arr.array('i',[13,34,52,22,34,3,10,22,34,45,39,22])x = 34#searching the element with in given rangeindex = my_arr2.index(x,2,6)print("The index of the element", x, "within the  given range", ":",index)

Output

Following is the output of the above code −

The index of the element 34 within the  given range : 4

Example 3

When we try to find the element, which is not present in an array we getValue error.

Here, we have created an array ofdouble datatype and we are trying to find the element which is not present in the array we goterror −

import array as arrmy_arr3 = arr.array('d',[1.4,2.9,6.6,5.9,10.5,3.4])x = 34#searching the element with in given rangeindex = my_arr3.index(x)print("The index of the element", x, "within the  given range", ":",index)

Output

Traceback (most recent call last):  File "E:\pgms\Arraymethods prgs\index.py", line 27, in <module>    index = my_arr3.index(x)          ^^^^^^^^^^^^^^^^ValueError: array.index(x): x not in array

Example 4

In this method, we can start searching an element from specified index value following is the example −

import array as arrmy_arr4 = arr.array('d',[1.4, 2.9, 3.4, 5.9, 10.5, 3.4, 7.9])x = 3.4#Searching from specified indexindex = my_arr4.index(x,5)print("The index of the element", x, "within the  given range", ":",index)

Output

The index of the element 3.4 within the  given range : 5