python的内置函数(十一)、range()

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 
>>>