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列表是任何元素的序列,而字符串只是一个字符序列,二者均为序列类型
1.基本语法[]创建
[]创建空的列表对象,a=[10,20,'abc']
2.list()创建
list可将任何可迭代的数据转换为列表
list()创建空的列表对象,即a=[]
a=list("abcd"),输出a=['a','b','c','d']
a=list(range(10))输出a为[0,1,2,3,4,5,6,7,8,9]
range表示整数0——9
3.range()创建整数列表,返回的是一个range对象,不是列表,所以要用list()将其转换成列表
range([start],end,[step])
start:可选,表示起始数字,默认为0
end:必选,表示结尾数字
step:可选,表示步长,默认为1
三者均可为负数
比如:list(range(3,15,2))==>[3,5,7,9,11,13]
list(range(3,-10,-1))==>[3,2,1,0,-1,-2,-3,-4,-5,-6,-7,-8,-9]
4.推导式创建列表
比如:a=[x*2 for x in range(5)]==>[0,2,4,6,8](表示0——4都乘2)
a=[x*2 for x in range(100) if
x%9==0]==>[0,18,36,54,72,90,108,126,144,162,180,198]