old = [1,2,3,4,5]
new = old
old = [6]
print(new)

[1, 2, 3, 4, 5]

list1 = [1, [1, 2, ['小甲鱼']], 3, 5, 8, 13, 18]
list1 [1][2] = ['小鱿鱼']
list1

[1, [1, 2, ['小鱿鱼']], 3, 5, 8, 13, 18]

list = [1, 2, 3, 4, 5]
list[-5:0]
list

[1, 2, 3, 4, 5]

list = [1, 2, 3, 4, 5]
list[::-1]
list

[1, 2, 3, 4, 5]

list = [1, 2, 5, 4, 3]
list.sort()
list

[1, 2, 3, 4, 5]

list = [9, 8, 3, 1, 6]
list1 = list.sort()
print(list1)

None

[ i*i for i in range(10) ]

[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

list1 = []
for x in range(10):
    list1.append(x**2)
print(list1)

[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

list1 = [1, [1, 2, ['小甲鱼']], 3, 5, 8, 13, 18]
list1[1][2][0] = '小鱿鱼'
list1

[1, [1, 2, ['小鱿鱼']], 3, 5, 8, 13, 18]

list1 = []
for x in range(10):
    for y in range(10):
        if x%2 == 0:
            if y%2 != 0:
                list1.append((x, y))
print(list1)

[(0, 1), (0, 3), (0, 5), (0, 7), (0, 9), (2, 1), (2, 3), (2, 5), (2, 7), (2, 9), (4, 1), (4, 3), (4, 5), (4, 7), (4, 9), (6, 1), (6, 3), (6, 5), (6, 7), (6, 9), (8, 1), (8, 3), (8, 5), (8, 7), (8, 9)]