列表的定义和创建

定义：[]内以逗号分隔，按照索引，存放各种数据类型，每个位置代表一个元素

列表的创建

list_test=[‘张三‘,‘李四’,'alex']#或list_test=list('alex')#或list_test=list([‘张三‘,‘李四’,'alex'])列表的特点和常用操作

特性：

1.可存放多个值

2.按照从左到右的顺序定义列表元素，下标从0开始顺序访问，有序

3.可修改指定索引位置对应的值，可变

常用操作：

#索引>>>l=['egon','alex','seven','yuan']>>>l[0]'egon'>>>l[2]'seven'#切片>>>l[0:2]['egon','alex']>>>l[2:5]['seven','yuan']>>>l[:2]['egon','alex']>>>l[2:]['seven','yuan']>>>l[:]['egon','alex','seven','yuan']>>>l[::2]['egon','seven']>>>l[::-1]['yuan','seven','alex','egon']#追加>>>l.append("eva")>>>l['egon','alex','seven','yuan','eva']#删除>>>l.remove('eva')>>>l['egon','alex','seven','yuan']>>>l.pop()'yuan'>>>l['egon','alex','seven']#长度>>>len(l)3#包含>>>'seven'inlTrue>>>'yuan'inlFalse#循环:为什么是“i”？>>>foriinl:print(i)egonalexseven列表与字符串——split和join

#分割>>>s='helloworld'>>>s.split('')['hello','world']>>>s2='hello,world'>>>s2.split(',')#连接>>>l=['hi','eva']>>>'!'.join(l)'hi!eva'range

>>>range(1,100)range(1,100)>>>list(range(1,100))[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99]>>>list(range(10))[0,1,2,3,4,5,6,7,8,9]>>>list(range(0,100,2))[0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98]