复习函数range( )

语法

range(star ,end, step)   # start默认为0，step默认为1
range(star, end)    #默认step为1
range(end) # 默认了star为0，step 为0

示例

>>>list(range(1, 20, 2))
[1,3,5,7,9,11,13,15,17,19]

>>>list(range(1,20))
[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]
>>>list(range(20))
[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]