Why does my print function return "None" when I run the code?

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#1

The question is " Write a function named append_sum that has one parameter — a list named named lst .

The function should add the last two elements of lst together and append the result to lst ."
My solution is following here:

def append_sum(lst):
x = lst.append(lst[-1] + lst[-2])
return x

print(append_sum([1, 1, 2]))

Instead of printing 3, ‘None’ get printed. Can someone help me in this regard?

#2

.append() appends to the list in memory. The append method doesn’t return anything, so you get None (the absence of a return value)

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