python中xrange用法分析

>>> x=xrange(0,8)
>>> print x
xrange(8)
>>> print x[0]
0
>>> print x[7]
7
>>> print x[8]
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
IndexError: xrange object index out of range
>>> x=range(0,8)
>>> print x
[0, 1, 2, 3, 4, 5, 6, 7]
>>> print x[0]
0
>>> print x[8]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range
range([start,] stop [,step])->list of integers