def inplace(a: list):
    for i in range(0, len(a) - len(a) % 2, 2):
        a[i], a[i + 1] = a[i + 1], a[i]


for upper in (10, 11):
    a = list(range(1, upper))

    aa = a.copy()
    inplace(aa)
    print(aa)