list数据索引

普通索引

list_data = [1, 4, 3, 12, 7, 8, 10, 100, 120]
print(list_data[1:5])
#运行结果：[4, 3, 12, 7]

步长索引

list_data = [1, 4, 3, 12, 7, 8, 10, 100, 120]
#以步长为2进行索引
print(list_data[:5:2])
#运行结果：[1, 3, 7]

反向索引

list_data = [1, 4, 3, 12, 7, 8, 10, 100, 120]
print(list_data[:5:-1])
#运行结果：[120, 100, 10]

反向步长索引

list_data = [1, 4, 3, 12, 7, 8, 10, 100, 120]
print(list_data[:5:-2])
#运行结果：[120, 10]