Python - Alternate Elements operation on Tuple

Python – Alternate Elements operation on Tuple

Last Updated : 02 Jun, 2020

Sometimes, while working with Python Tuples, we can have problem in which we need to perform operations of extracted alternate chains of tuples. This kind of operation can have application in many domains such as web development. Lets discuss certain ways in which this task can be performed.

Input : test_tuple = (5, 6, 3)
Output :
The alternate chain sum 1 : 6
The alternate chain sum 2 : 8

Input : test_tuple = (5, 6)
Output :
The alternate chain sum 1 : 6
The alternate chain sum 2 : 5

Method #1 : Using loop + enumerate()
The combination of above functions provide brute force solution to this problem. In this, we extract the elements along with indices using enumerate() and perform chaining using condition.

# Python3 code to demonstrate working of  
# Alternate Elements operation on Tuple 
# Using loop + enumerate() 
  
# initializing tuple 
test_tuple = (5, 6, 3, 6, 10, 34) 
  
# printing original tuple 
print("The original tuple : " + str(test_tuple)) 
  
# Alternate Elements operation on Tuple 
# Using loop + enumerate() 
sum1 = 0
sum2 = 0
for idx, ele in enumerate(test_tuple): 
    if idx % 2: 
        sum1 += ele 
    else : 
        sum2 += ele 
  
# printing result  
print("The alternate chain sum 1 : " + str(sum1)) 
print("The alternate chain sum 2 : " + str(sum2))  

Output :

The original tuple : (5, 6, 3, 6, 10, 34)
The alternate chain sum 1 : 46
The alternate chain sum 2 : 18

Method #2 : Using list slicing
This problem can also be performed using slicing operations. In this, we perform the task of extracting alternate chains using list slicing technique.

# Python3 code to demonstrate working of  
# Alternate Elements operation on Tuple 
# Using list slicing 
  
# initializing tuple 
test_tuple = (5, 6, 3, 6, 10, 34) 
  
# printing original tuple 
print("The original tuple : " + str(test_tuple)) 
  
# Alternate Elements operation on Tuple 
# Using list slicing 
sum1 = sum(test_tuple[1::2]) 
sum2 = sum(test_tuple[0::2]) 
  
# printing result  
print("The alternate chain sum 1 : " + str(sum1)) 
print("The alternate chain sum 2 : " + str(sum2))  

Output :

The original tuple : (5, 6, 3, 6, 10, 34)
The alternate chain sum 1 : 46
The alternate chain sum 2 : 18

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