range(start, stop[, step])

>range(10)    # 从 0 开始到 10

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

> range(1, 11)   # 从 1 开始到 11

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

> range(0, 30, 5) # 步长为 5

[0, 5, 10, 15, 20, 25]

> range(0, 10, 3) # 步长为 3

[0, 3, 6, 9]

> range(0, -10, -1) # 负数

[0, -1, -2, -3, -4, -5, -6, -7, -8, -9]

> range(0)

[]

> range(1, 0)

[]

>x = 'runoob'

> for i in range(len(x)) :

...   print(x[i])

... 

r

u

n

o

o

b

>