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I want to do something like this:
myList = [10, 20, 30] yourList = myList.append(40) Unfortunately, list append does not return the modified list.
So, how can I allow append to return the new list?
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The usual append method adds the new element in the original sequence and does not return any value.
A Python function can return any object such as a list. To return a list, first create the list object within the function body, assign it to a variable your_list , and return it to the caller of the function using the keyword operation “ return your_list “.
The append() function in Python takes a single item as an input parameter and adds it to the end of the given list. In Python, append() doesn't return a new list of items; in fact, it returns no value at all. It just modifies the original list by adding the item to the end of the list.
Don't use append but concatenation instead:
yourList = myList + [40] This returns a new list; myList will not be affected. If you need to have myList affected as well either use .append() anyway, then assign yourList separately from (a copy of) myList.
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In python 3 you may create new list by unpacking old one and adding new element:
a = [1,2,3] b = [*a,4] # b = [1,2,3,4] when you do:
myList + [40] You actually have 3 lists.
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