列表的查 - 码农教程

############################################################################查（从0开始）
#切片，顾头不顾尾
#只取第三个到第四个

a=['xiaoxing','xiaoliu','xiaozhang','xiaohong','xiaoli','xiaozhao']
print(a[2:4])

输出结果：
['xiaozhang', 'xiaohong']





#取第三个到最后

a=['xiaoxing','xiaoliu','xiaozhang','xiaohong','xiaoli','xiaozhao']
print(a[2:])


输出结果：

['xiaozhang', 'xiaohong', 'xiaoli', 'xiaozhao']



#从第二个开始取，到倒数第二个

a=['xiaoxing','xiaoliu','xiaozhang','xiaohong','xiaoli','xiaozhao']
print(a[1:-1])


输出结果：
['xiaoliu', 'xiaozhang', 'xiaohong', 'xiaoli']





#步长，从第二个开始取，到倒数第二个,取到的值再相隔2个取

a=['xiaoxing','xiaoliu','xiaozhang','xiaohong','xiaoli','xiaozhao']
print(a[1:-1:2])



输出结果：
['xiaoliu', 'xiaohong']


#步长，从第二个开始取，隔两个取一次

a=['xiaoxing','xiaoliu','xiaozhang','xiaohong','xiaoli','xiaozhao']
print(a[1::2])


输出结果：
['xiaoliu', 'xiaohong', 'xiaozhao']


#从第四个开始取值，并且从以选取的值中，第2位反向选取：

a=['xiaoxing','xiaoliu','xiaozhang','xiaohong','xiaoli','xiaozhao']
print(a[3::-1])


输出结果：
['xiaohong', 'xiaozhang', 'xiaoliu', 'xiaoxing']

b=['0','1','2','3','4','5','6']
print(b[4::-1]


输出结果：
['4', '3', '2', '1', '0']

原文地址：https://www.cnblogs.com/daino/p/11856097.html