#참조에 의한 호출
def modify2(li):
li += [100,200]
list = [1,2,3,4,5]
print(list)
modify2(list)
print(list) #값이 변화
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[1, 2, 3, 4, 5]
[1, 2, 3, 4, 5, 100, 200]