Python:max(以字符为单位的数字列表)给出对与错的答案 [英] Python: max(a list of numbers as characters) gives right and wrong answer

问题描述

因此，这是确切的情况-请考虑以下列表:

So here's the exact scenario- consider the list:

x = ['4'，'5'，'29'，'54'，'4'，'0'，'-214'，'542'，'-64'，'1'，-3"，"6"，-6"] 现在， max(x)应该给出 '542' ，而不是'6'，但是如果您取出'6'，它的确给出了'542'的最大值.另一方面， min(x)正确地给出了'-214'作为答案.

x=['4', '5', '29', '54', '4', '0', '-214', '542', '-64', '1', '-3', '6', '-6'] now max(x) should give '542' instead it gives '6', but if you take out '6' it does give '542' as max. min(x) on the other hand correctly gives '-214' as the answer.

如果将 x 转换为数字列表，则显然 max(x)会给出正确的输出 542 .至少从我对Python的了解来看，这是一种不可靠的行为，我想探究一下我是否在这里缺少有关 max()函数如何工作的解释该行为的信息.

if you convert x into a list of numbers then obviously max(x) gives the correct output 542. This is an unreliable behavior at least from what I know about Python and I would like to explore if I am missing something here on how max() function works that could explain this behavior.

推荐答案

在编写此问题并尝试通过 max()函数理解此行为时，我尝试了 x.sort()，它给出了答案.因此，让我粘贴排序后的列表:

As I was writing this question and trying to understand this behavior with max() function, I tried x.sort() and it gave out the answer. So let me paste the sorted list:

['-214'，'-3'，'-6'，'-64'，'0'，'1'，'29'，'4'，'4'，'5'，"54"，"542"，"6"]

所以基本上这些都是字符串，字符串的初始字符决定了它的值为字符串.意思是， 5kaify 比 6kaify 首先.

So basically these are strings and initial character of the string decides its value as string. Meaning, 5kaify will come first than 6kaify .

为更加清楚起见，如果我将一堆字母添加到此列表中，如下所示:

For more clarity, if I add bunch of alphabets into this list as below:

x = ['4'，'5'，'29'，'54'，'4'，'0'， 'd' ，'-214'，'542'，'-64'，'1'， 'a' ，'-3'， 'c' ，'6'，'-6']

max(x)将给出 'd' 作为答案，因为按字母顺序，它将比列表中的所有字符串晚，因此 max() 会检查字母顺序是否是字符串/字符列表的值，而不是其整数/数值.希望这会有所帮助.

max(x) will give 'd' as the answer as alphabetically it would come later than all the strings in the list, hence max() checks for alphabetical order as the value for list of strings/characters and not its integral/numeric value. Hope this was helpful.

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