Python中的Max函数返回错误结果

本文介绍了Python中的Max函数返回错误结果的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试从CSV文件中的一组数字中找到最大值和最小值.我的代码在某些行中不断为Max函数返回错误的数字.这是我的代码:

I am trying to find the Max and Min in a set of numbers from a CSV file. My code keeps returning the wrong number for Max function for some rows. Here is my code:

with open('Cortex_vs_Liver_trial.csv', newline='') as infile: reader = csv.reader(infile) for row in reader: print(row) print('The maximun is:', max(row)) print('The minimum is:', min(row))

我的输出示例:

['86.21', '100.00', '96.30'] The maximun is: 96.30 The minimum is: 100.00

我不确定我做错了什么.一些建议将不胜感激.

I am not sure what I have done wrong. Some advice would be appreciated.

推荐答案

您的列表元素是字符串.您需要将它们转换为float，以避免按字典顺序进行比较(按字母顺序一次比较一个字符，其中'100' < '2'因为1 < 2)

Your list elements are strings. You need to convert them to float to avoid comparing lexicographically (alphabetically, one character at a time, where '100' < '2' because 1 < 2)

numrow = [float(x) for x in row] print('The maximun is:', max(numrow)) print('The minimum is:', min(numrow))

除非您实际上想要字符串，否则不要创建新列表，只需将key=float传递给您的max()函数:

Unless you actually want strings, in which case don't make the new list, and just pass key=float to your max() function:

max(numrow, key=float)