如何使用python从csv文件中提取最小值和最大值 [英] how to extract the min value and max value from csv file using python

问题描述

我有一个python脚本，可从csv文件读取并将请求的列附加到2空列表中.之后，我需要提取所提取列的最小值和最大值.

i have a python script that read from csv file and append the requested columns into 2 empty list. after that i need to extract the minimum and maximum value of the columns extracted.

我写了这段代码，但由于结果为空，所以似乎不起作用.

i wrote this code but it seems not working be cause the result is empty .

import csv
mydelimeter = csv.excel()
mydelimeter.delimiter=";"
myfile = open("C:/Users/test/Documents/R_projects/homework/rdu-weather-history.csv")
myfile.readline()
myreader=csv.reader(myfile,mydelimeter)
mywind,mydate=[],[]
minTemp, maxTemp = [],[]

for row in myreader:
    print(row[1],row[2])
    minTemp.append(row[1])
    maxTemp.append(row[2])
print ("min value element : ", min(minTemp))
print ("max value element : ", min(maxTemp))

推荐答案

您可以使用Pandas，将数据加载到DataFrames中，它们具有诸如Sum，Max，Min，AVG等内置功能.<​​/p>

You can Use Pandas Where You can load the data into DataFrames and They have inbuilt functions such as Sum,Max,Min,AVG etc.

import pandas as pd

df=pd.read_csv('Name.csv')


#FINDING MAX AND MIN
p=df['ColumnName'].max()
q=df['ColumnName'].min()


print(q)

就这样，您将在指定"列中找到最小值".

Thats it You will find the Min value in the Specified column.

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