Home Backend Development Python Tutorial python使用in操作符时元组和数组的区别分析

python使用in操作符时元组和数组的区别分析

Jun 06, 2016 am 11:16 AM
python

在python中可以使用in符号判断指定的元素是否存在于列表中,但我发现元组和数组存在区别,下面是详细实验结果。

>>> 'bitsCN.com' in ['haotu.net','bitsCN.com']
True
>>> 'bitsCN.com' in ('haotu.net','bitsCN.com')
True
 
>>> 'bitsCN.com' in ['bitsCN.com/codes','haotu.net']
False
>>> 'bitsCN.com' in ('bitsCN.com/codes','haotu.net')
False
 
>>> 'bitsCN.com' in ['bitsCN.com/codes']
False
>>> 'bitsCN.com' in ('bitsCN.com/codes')
True

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前面5条测试都符合我们的预期,只有最后一条,将数组换成元组后,在元组中只有一个元素的时候,python居然是把元组当成了字符串处理,不知道为什么会有这样的处理方式,但开发的时候却要注意,只用in语句判断数组中是否存在制定元素时,最好用[]的数组,而非元组

以上所述就是本文的全部内容了,希望大家能够喜欢。

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