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' in l
True
>>> 'yuan' in l
False
#循环:为什么是“i”？
>>> for i in l:
print(i)
egon
alex
seven列表与字符串——split和join
#分割
>>> s = 'hello world'
>>> 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]
