Differences between xrange and range in python

Description of the range Function: range ([start,] stop [, step]) generates a Sequence Based on the range specified by start and stop and the step size set by step.
Range example:
Copy codeThe Code is as follows: >>> range (5)
[0, 1, 2, 3, 4]
>>> Range (1, 5)
[1, 2, 3, 4]
>>> Range (0, 6, 2)
[0, 2, 4]

Xrange Function Description: The usage is exactly the same as that of range. The difference is that not an array is generated, but a generator.
Xrange example:
Copy codeThe Code is as follows: >>> xrange (5)
Xrange (5)
>>> List (xrange (5 ))
[0, 1, 2, 3, 4]
>>> Xrange (1, 5)
Xrange (1, 5)
>>> List (xrange (1, 5 ))
[1, 2, 3, 4]
>>> Xrange (0, 6, 2)
Xrange (0, 6, 2)
>>> List (xrange (0, 6, 2 ))
[0, 2, 4]

As shown in the preceding example, xrange is much better than range when a large number sequence is to be generated, because it does not need to open up a large memory space, these two are basically used in the Loop:
Copy codeThe Code is as follows:
For I in range (0,100 ):
Print I

For I in xrange (0,100 ):
Print I

The two outputs have the same results. In fact, there are many differences. range directly generates a list object:
Copy codeThe Code is as follows: a = range (0,100)
Print type ()
Print
Print a [0], a [1]

Output result:
Copy codeThe Code is as follows: <type 'LIST'>
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99]
0 1

Xrange does not directly generate a list, but returns a value in each call:
Copy codeThe Code is as follows: a = xrange (0,100)
Print type ()
Print
Print a [0], a [1]

Output result:
Copy codeThe Code is as follows: <type 'xrange'>
Xrange (100)
0 1