【python】数组与步长

概念

数组：mumber = [1,3,5,7,9,6,7,8,9,10,11,12,13]

数组截取：number[number.startIndex：number.endIndex：1]

数值截取默认形参：数组首索引：数组尾部索引：默认步长1

步长：（类似1个数组值一个阶梯，从数组0值（1）到数组4值（5）步长为4）

案例

    number= [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
    test = number[1:10:3]
    print(test)
    test = number[:10:-3]
    print(test)
    test = number[1::3]
    print(test)
    test = number[:10:3]
    print(test)
    test = number[10:1:-3]
    print(test)
    test = number[1:10:]
    print(test)
    test = number[3]
    print(test)
    test = number[1:-3:]
    print(test)

结果

[2, 5, 8]
[16, 13]
[2, 5, 8, 11, 14]
[1, 4, 7, 10]
[11, 8, 5]
[2, 3, 4, 5, 6, 7, 8, 9, 10]
4
[2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]