Python 数组/列表

Posted 2020-09-20

范围取值

指定范围

names = ["零","一","二","三","四","五","六","七"]
print(names[1:4])#打印 一,二,三 左包括右不包括

从某位置取到末尾

names = ["零","一","二","三","四","五","六","七"]
print(names[1:])#打印 [‘一‘, ‘二‘, ‘三‘, ‘四‘, ‘五‘, ‘六‘, ‘七‘]

从某位置取到倒数第几个

names = ["零","一","二","三","四","五","六","七"]
print(names[1:-3])#打印 [‘一‘, ‘二‘, ‘三‘, ‘四‘]

跳着取值

names = ["零","一","二","三","四","五","六","七"]
print(names[0::1])#打印[‘零‘, ‘一‘, ‘二‘, ‘三‘, ‘四‘, ‘五‘, ‘六‘, ‘七‘]  //从头到尾一个一个取
print(names[0:-1:2])#打印[‘零‘, ‘二‘, ‘四‘, ‘六‘]  //从头到倒数第二个,跳着一个一个取
print(names[0::3])#打印[‘零‘, ‘三‘, ‘六‘]    //从头到尾跳着两个取

倒数取值

names = ["零","一","二","三","四","五","六","七"]
print(names[5::-1])#打印[‘五‘, ‘四‘, ‘三‘, ‘二‘, ‘一‘, ‘零‘]    //第5个元素到第1个元素,倒着一个一个取
print(names[6:2:-2])#打印[‘六‘, ‘四‘]    //第6个元素到第2个元素,倒着跳一个一个取
print(names[-1:0:-2]