[Python] Why assignment and sort of python list in one step doesn't work? [duplicate]

The below code prints r as intended by sorting scores.

scores=[1,2,4,2,4,7,1]
scores.sort()
r=scores
print(r)


However, the code prints r as null if I try doing the assignment in the same step as the sort. Can you help why that is the case?

scores=[1,2,4,2,4,7,1]
r=scores.sort()
print(r)

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