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Python | Adding N to Kth tuple element

Last Updated : 23 Feb, 2023
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Many times, while working with records, we can have a problem in which we need to change the value of tuple elements. This is a common problem while working with tuples. Let's discuss certain ways in which N can be added to Kth element of tuple in list. 

Method #1 : Using loop Using loops this task can be performed. In this, we just iterate the list to change the Kth element by predefined value N in code. 

Python3 
# Python3 code to demonstrate working of 
# Adding N to Kth tuple element 
# Using loop 

# Initializing list 
test_list = [(4, 5, 6), (7, 4, 2), (9, 10, 11)] 

# printing original list 
print("The original list is : " + str(test_list)) 

# Initializing N 
N = 3

# Initializing K 
K = 1

# Adding N to Kth tuple element 
# Using loop 
res = [] 
for i in range(0, len(test_list)): 
    res.append((test_list[i][0], test_list[i][K] + N, test_list[i][2])) 

# printing result 
print("The tuple after adding N to Kth element : " + str(res))

Output
The original list is : [(4, 5, 6), (7, 4, 2), (9, 10, 11)]
The tuple after adding N to Kth element : [(4, 8, 6), (7, 7, 2), (9, 13, 11)]

Time complexity: O(n), where n is the length of the list.
Auxiliary space: O(n), where n is the length of the list

Method #2: Using list comprehension This method is having the same approach as the above method, just reduces lines of code using list comprehension functionality to make code compact by size. 

Python3 
# Python3 code to demonstrate working of 
# Adding N to Kth tuple element 
# Using list comprehension 

# Initializing list 
test_list = [(4, 5, 6), (7, 4, 2), (9, 10, 11)] 

# printing original list 
print("The original list is : " + str(test_list)) 

# Initializing N 
N = 3

# Initializing K 
K = 1

# Adding N to Kth tuple element 
# Using list comprehension 
res = [(a, b + N, c) for a, b, c in test_list] 

# printing result 
print("The tuple after adding N to Kth element : " + str(res))

Output
The original list is : [(4, 5, 6), (7, 4, 2), (9, 10, 11)]
The tuple after adding N to Kth element : [(4, 8, 6), (7, 7, 2), (9, 13, 11)]

Time Complexity: O(n), where n is the number of tuples in the list.

Auxiliary Space: O(n), as we are creating a new list to store the modified tuples.

Method #3: Using map() and lambda function
This method is an alternative to using loops and list comprehension, it uses the map function to iterate over the list and a lambda function to add N to the Kth element of each tuple.

Python3 
# Python3 code to demonstrate working of
# Adding N to Kth tuple element
# Using map() and lambda function
  
# Initializing list
test_list = [(4, 5, 6), (7, 4, 2), (9, 10, 11)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Initializing N 
N = 3 
  
# Initializing K 
K = 1
  
# Adding N to Kth tuple element
# Using map() and lambda function
res = list(map(lambda x: (x[0], x[K]+N, x[2]), test_list))
  
# printing result
print("The tuple after adding N to Kth element : " + str(res))
#This code is contributed by Edula Vinay Kumar Reddy

Output
The original list is : [(4, 5, 6), (7, 4, 2), (9, 10, 11)]
The tuple after adding N to Kth element : [(4, 8, 6), (7, 7, 2), (9, 13, 11)]

Time complexity: O(n)
Auxiliary Space: O(n)


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