其中，range直接返回的是個list，而xrange返回的是一個生成器。根據文檔所說，xrange更快一點，而且更省內存。

文檔如下：

>>> help(range)
Help on built-in function range in module __builtin__:


range(...)
? ? range([start,] stop[, step]) -> list of integers
? ??
? ? Return a list containing an arithmetic progression of integers.
? ? range(i, j) returns [i, i+1, i+2, ..., j-1]; start (!) defaults to 0.
? ? When step is given, it specifies the increment (or decrement).
? ? For example, range(4) returns [0, 1, 2, 3]. ?The end point is omitted!
? ? These are exactly the valid indices for a list of 4 elements.


>>> help(xrange)
Help on class xrange in module __builtin__:


class xrange(object)
?| ?xrange([start,] stop[, step]) -> xrange object
?| ?
?| ?Like range(), but instead of returning a list, returns an object that
?| ?generates the numbers in the range on demand. ?For looping, this is?
?| ?slightly faster than range() and more memory efficient.
?| ?
?| ?Methods defined here:
?| ?
?| ?__getattribute__(...)
?| ? ? ?x.__getattribute__('name') <==> x.name
?| ?
?| ?__getitem__(...)
?| ? ? ?x.__getitem__(y) <==> x[y]
?| ?
?| ?__iter__(...)
?| ? ? ?x.__iter__() <==> iter(x)
?| ?
?| ?__len__(...)
?| ? ? ?x.__len__() <==> len(x)
?| ?
?| ?__reduce__(...)
?| ?
?| ?__repr__(...)
?| ? ? ?x.__repr__() <==> repr(x)
?| ?
?| ?__reversed__(...)
?| ? ? ?Returns a reverse iterator.
?| ?
?| ?----------------------------------------------------------------------
?| ?Data and other attributes defined here:
?| ?
?| ?__new__ = <built-in method __new__ of type object>
?| ? ? ?T.__new__(S, ...) -> a new object with type S, a subtype of T

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