Python medium range () and xrange () usage Analysis _python

The examples in this article describe the use of range () and xrange () in Python. Share to everyone for your reference, specific as follows:

Range is said to be more expensive than xrange because range generates a list object directly, and Xrange returns one of its values each time it is invoked (reference: http://www.jb51.net/article/50072.htm). So curiosity did a little test to compare the performance of two functions in the end how much difference.

(1) Test code

#!/usr/bin/env python from
datetime import *
def test_range ():
    c1=0
    t1 = DateTime.Now () to
    I in Range (0,100000):
        C1 + 1
    print datetime.now ()-t1
def test_xrange (): c1=0 t1
    = DateTime.Now () For
    i in Xrange (0,100000):
        C1 + + 1
    print datetime.now ()-t1
if __name__ = ' __main__ ':
    test_ Range ()
    Test_xrange ()

(2) Operation result

(3) Summary

From the three running results of the above figure, we can see that range is about 70% more than xrange in the same amount of calculation. In addition, in the case of different computational volume, the usage is basically maintained in this proportion. Therefore, Xrange is a good choice if you do not need to return to the list object.

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I hope this article will help you with Python programming.