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Python – Add list elements to tuples list
  • Last Updated : 10 Jul, 2020

Sometimes, while working with Python tuples, we can have a problem in which we need to add all the elements of a particular list to all tuples of a list. This kind of problem can come in domains such as web development and day-day programming. Let’s discuss certain ways in which this task can be done.

Input : test_list = [(5, 6), (2, 4), (5, 7), (2, 5)], sub_list = [5, 4]
Output : [(5, 6, 5, 4), (2, 4, 5, 4), (5, 7, 5, 4), (2, 5, 5, 4)]

Input : test_list = [(5, 6), (2, 4), (5, 7), (2, 5)], sub_list = [5]
Output : [(5, 6, 5), (2, 4, 5), (5, 7, 5), (2, 5, 5)]

Method #1 : Using list comprehension + "+" operator
The combination of above functionalities can be used to solve this problem. In this, we perfrom task of adding tuple to list using “+” operator and iteration over all tuples is done using list comprehension.




# Python3 code to demonstrate working of 
# Add list elements to tuples list
# Using list comprehension + "+" operator
  
# initializing list
test_list = [(5, 6), (2, 4), (5, 7), (2, 5)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing list 
sub_list = [7, 2, 4, 6]
  
# Add list elements to tuples list
# Using list comprehension + "+" operator
res = [sub + tuple(sub_list) for sub in test_list]
  
# printing result 
print("The modified list : " + str(res)) 
Output :



The original list is : [(5, 6), (2, 4), (5, 7), (2, 5)]
The modified list : [(5, 6, 7, 2, 4, 6), (2, 4, 7, 2, 4, 6), (5, 7, 7, 2, 4, 6), (2, 5, 7, 2, 4, 6)]

 

Method #2 : Using list comprehension + "*" operator
The combination of above functions can be used to solve this problem. In this, we perform the task of adding list to a tuple using pack-unpack operator “*”. This is more efficient method than above method.




# Python3 code to demonstrate working of 
# Add list elements to tuples list
# Using list comprehension + "*" operator
  
# initializing list
test_list = [(5, 6), (2, 4), (5, 7), (2, 5)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing list 
sub_list = [7, 2, 4, 6]
  
# Add list elements to tuples list
# Using list comprehension + "*" operator
res = [(*sub, *sub_list) for sub in test_list]
  
# printing result 
print("The modified list : " + str(res)) 
Output :
The original list is : [(5, 6), (2, 4), (5, 7), (2, 5)]
The modified list : [(5, 6, 7, 2, 4, 6), (2, 4, 7, 2, 4, 6), (5, 7, 7, 2, 4, 6), (2, 5, 7, 2, 4, 6)]

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