python dict字典循环遍历性能 iteritems比items快

最新推荐文章于 2023-04-07 21:49:22 发布

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#python #字典 #dict #遍历 #items

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博客主要讲述Python中dict字典的循环遍历，通过测试结果表明，iteritems的遍历速度比items快一个数量级，聚焦于Python字典遍历性能差异这一信息技术相关内容。

dict字典循环遍历，从测试结果看，iteritems比items快一个数量级

In [32]: def add_dic(a, num):
    ...:     for i in range(num):
    ...:         a[i] = "value" + str(i)
    ...:

In [33]: def xun(a):
    ...:     print "begin"
    ...:     for key, value in a.items():
    ...:         continue
    ...:     print "over"
    ...:

In [34]: def xun1(a):
    ...:     print "begin"
    ...:     for key, value in a.iteritems():
    ...:         continue
    ...:     print "over"
    ...:

In [35]: add_dic(a, 1000000)

In [36]: time xun(a)
begin
over
CPU times: user 728 ms, sys: 0 ns, total: 728 ms
Wall time: 733 ms

In [37]: time xun1(a)
begin
over
CPU times: user 56 ms, sys: 0 ns, total: 56 ms
Wall time: 57.9 ms