In this post, we will learn Why does append() always return None in Python as append is the task when working on modifying the existing files rather than creating new ones as it adds one object or element at the end of another so it does not results or print anything.
Append()
Although it can also be returning some value of our choice provided we need to call the function. And when we just call the function of append we simply add one element at the end of other elements and the final result stores the length of both combined it does not create here anything new so it does not results or prints anything or we can simply say it results or print none.
And for the same, we have given an example to see the example and understand it better.
my_list = [1, 2, 3] new_length = my_list. append(4) print( my_list) # Output: [1, 2, 3, 4] print( new_length) # Output: None
Here we have a predefined list named my list which has three elements in the next line, we simply added another element to it and the size of the same list becomes four with ‘4’4 as a new element in it. We also stored the output of the function into another variable named new length so that the new elements of my list must be stored but in the result, we can see there is nothing in new length as the append function has printed none.
And we really want the newly entered data and the old list should store in another new list here the list name was a new length we need to use the ‘+’ plus operator instead of append where we can store the new list as the updated elements along with old elements whereas the elements in old list will remain the same for understanding it more clearly go through the example is given below.
my_ list = [1, 2, 3] new_ list = my_ list + [4] print( my_ list) # Output: [1, 2, 3] print( new_ list) # Output: [1, 2, 3, 4]
The output of the functions is explained here only where the output of each print will be different.
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