python数字字符串比较 [英] python numeric string comparison

问题描述

我有从 JSON 对象加载的数值，因此都是字符串。

I have numerical values that are loaded from a JSON object and are therefore all strings.

我在对这些字符串进行数值比较时遇到问题。以下内容对我来说毫无意义，我希望你们中的一位冠军能解释一下。.

I am having issues with making numerical comparisons with these strings. The following makes no sense to me and I was hoping one of you champions could explain..

In[2]: print '100' < '45'
True

In[3]: print '99' < '45'
False

使用 Python 2.7

推荐答案

比较字符串时，将根据字符的ascii值对其进行比较。 '1'的值为49，而'4'的值为52。因此'1 '是< ‘4’。 '9'是57，所以'9'是>' 4'。

When comparing strings they're compared by the ascii value of the characters. '1' has a value 49, and '4' is 52. So '1' is < '4'. '9' however is 57, so '9' is > '4'.

如果要对它们进行数字比较，可以先将字符串 int（）例如：

If you want to compare them numerically you could just int() the strings first like:

print int('100') < int('45')

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