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Python | Adding N to Kth tuple element

  • Last Updated : 29 Oct, 2019

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.

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# 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)]

 

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 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)]



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