Python – Add list elements to tuples list

• Last Updated : 27 Aug, 2021

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 perform task of adding tuple to list using “+” operator and iteration over all tuples is done using list comprehension.

Python3

 `# 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

 `# 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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