Python program to print the elements of an array present on even position

When it is required to print the elements of a list that are present at even index/position, a loop can be used to iterate over the elements, and only check the even positions in the list by specifying the step size as 2 in the range function.

Below is a demonstration of the same −

Example

my_list = [31, 42, 13, 34, 85, 0, 99, 1, 3]
print("The list is :")
print(my_list)
print("The elements in even positions are : ")
for i in range(0, len(my_list), 2):
    print(my_list[i])

Output

The list is :
[31, 42, 13, 34, 85, 0, 99, 1, 3]
The elements in even positions are : 
31
13
85
99
3

Alternative Methods

Using List Slicing

You can also use list slicing with step size 2 to get elements at even positions ?

my_list = [31, 42, 13, 34, 85, 0, 99, 1, 3]
print("The list is :")
print(my_list)
print("The elements in even positions are : ")
even_elements = my_list[::2]
print(even_elements)

The list is :
[31, 42, 13, 34, 85, 0, 99, 1, 3]
The elements in even positions are : 
[31, 13, 85, 99, 3]

Using List Comprehension

List comprehension provides a concise way to create a new list with elements at even positions ?

my_list = [31, 42, 13, 34, 85, 0, 99, 1, 3]
print("The list is :")
print(my_list)
print("The elements in even positions are : ")
even_elements = [my_list[i] for i in range(0, len(my_list), 2)]
print(even_elements)

The list is :
[31, 42, 13, 34, 85, 0, 99, 1, 3]
The elements in even positions are : 
[31, 13, 85, 99, 3]

Explanation

• A list is defined, and is displayed on the console.

• The list is iterated over beginning from the first index element (index 0), and the step size is mentioned as 2 in the range method.

• Those elements that are in even positions (indices 0, 2, 4, 6, 8) are displayed on the console.

• List slicing [::2] starts from index 0 and takes every second element.

• List comprehension creates a new list by iterating through even indices.

Conclusion

Use range(0, len(list), 2) for loop-based iteration, list[::2] for simple slicing, or list comprehension for functional programming approach. All methods extract elements at even positions (indices 0, 2, 4, etc.).