[Python] Why do we get a 'None' item when appending an item to an existing list? [duplicate]

Use case:
I want to append a new item along with all the existing items in a list to the same list.
Ex:

list = [ 'a', 'b', 'c']


Appending 'd', expecting the output as: ['a', 'b', 'c', 'a', 'b', 'c', 'd']

My code:

list.append(list.append('d'))


Current output:

['a', 'b', 'c', 'd', None]


Why am I getting a None item here and how can I print the list as expected?

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