Python - Constant Multiplication to Nth Column

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 K can be multiplied to Nth 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 Nth element by predefined value K in code.

# Python3 code to demonstrate working of 
# Constant Multiplication to Nth Column 
# 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 = 1
  
# Initializing K  
K = 3
  
# Constant Multiplication to Nth Column 
# Using loop 
res = [] 
for i in range(0, len(test_list)): 
    res.append((test_list[i][0], test_list[i][N] * K, test_list[i][2])) 
  
# printing result 
print("The tuple after multiplying K to Nth element : " + str(res)) 

Output :

The original list is : [(4, 5, 6), (7, 4, 2), (9, 10, 11)]
The tuple after multiplying K to Nth element : [(4, 15, 6), (7, 12, 2), (9, 30, 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 
# Constant Multiplication to Nth Column 
# 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 = 1
  
# Initializing K  
K = 3
  
# Constant Multiplication to Nth Column 
# Using list comprehension 
res = [(a, b * K, c) for a, b, c in test_list] 
  
# printing result 
print("The tuple after multiplying K to Nth element : " + str(res)) 

Output :

The original list is : [(4, 5, 6), (7, 4, 2), (9, 10, 11)]
The tuple after multiplying K to Nth element : [(4, 15, 6), (7, 12, 2), (9, 30, 11)]

My Personal Notes

Python – Constant Multiplication to Nth Column

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