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Python program to get even indexed elements in tuple

Here, we will have a tuple consisting of multiple elements. We will be creating a program in Python to get even indexed elements in the tuple.
Submitted by Shivang Yadav, on September 16, 2021

In this program, we will have a tuple consisting of multiple elements and We need to extract all elements of the tuple that are at an even index.

Before going further with the problem, let's recap some basic topics that will help in understanding the solution.

Python programming language is a high-level and object-oriented programming language. Python is an easy to learn, powerful high-level programming language. It has a simple but effective approach to object-oriented programming.

Tuples in Python is a collection of items similar to list with the difference that it is ordered and immutable.

Example:

tuple = ("python", "includehelp", 43, 54.23)

Getting Even Indexed Elements in Tuple

When we are working on python data structures. We might need to extract elements based on a specific pattern. in this program, we will be extracting an even index in the tuple.

Input:
(4, 1, 6, 8, 3)

Output:
(4, 6, 8)

To perform this task we simply need to traverse the tuple and get all the elements whose index is an even number. Python provides multiple methods to perform such tasks which can be easy and one of these methods might fit in the cases you required in your program in real-life programming.

Method 1:

One method to solve the problem is by iterating on the tuple using generator expression and then use the enumerate() function in order to check the index for even values and then create a tuple from these values using tuple() method.

# Python program to get even indexed elements
# in Tuple 

# Creating and printing the tuple 
myTuple = (4, 1, 6, 8, 3)
print("Elements of the tuple are : " + str(myTuple))

# Getting even indexed elements in Tuple
evenTuple = tuple(values for i, values in enumerate(myTuple) if i % 2 == 0)

# Printing even indexed tuple
print("All even indexed elements of the tuple : " + str(evenTuple))

Output:

Elements of the tuple are : (4, 1, 6, 8, 3)
All even indexed elements of the tuple : (4, 6, 3)

Method 2:

Another method to solve the problem is by using recursion. We will be using a recursive function to extract even values from the tuples and return the values as a tuple.

# Python program to get even indexed elements 
# in Tuple 

# Recursive function 
def getEvenValTupleRec(myTuple):
    if len(myTuple) == 0 or len(myTuple) == 1:
        return ()
    return (myTuple[0], ) + getEvenValTupleRec(myTuple[2:])
    
# Creating and printing the tuple 
myTuple = (4, 1, 6, 8, 3, 7)
print("Elements of the tuple are : " + str(myTuple))

# Getting even indexed elements in Tuple
evenTuple = getEvenValTupleRec(myTuple)

# Printing even indexed tuple
print("All even indexed elements of the tuple : " + str(evenTuple))

Output:

Elements of the tuple are : (4, 1, 6, 8, 3, 7)
All even indexed elements of the tuple : (4, 6, 3)

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