python3 - 成功将 CSV 文件读入 2D 数组后 - 如何按索引打印单个单元格？

Question

我想通过 python3 读取一个 CSV 文件（由温度传感器填充）。

将 CSV 文件读入数组可以正常工作。按索引打印单个单元格失败。请帮助正确的代码行。

这是代码。

import sys
import pandas as pd
import numpy as np
import array as ar

#Reading the CSV File

#  date;seconds;Time;Aussen-Temp;Ruecklauf;Kessel;Vorlauf;Diff
#  20211019;0;20211019;12,9;24;22,1;24,8;0,800000000000001
#  ...
#  ... (2800 rows in total)

np = pd.read_csv('/var/log/LM92Temperature_U-20211019.csv',
            header=0,
            sep=";",
            usecols=['date','seconds','Time','Aussen-      Temp','Ruecklauf','Kessel','Vorlauf','Diff'])

br = np # works fine
print (br) # works fine - prints whole CSV Table :-) !
#-----------------------------------------------------------
# Now I want to print the element [2] [3]  of the two dimensional "CSV" array ... How to manage that ?

print (br [2] [3]) # ... ends up with an error ...

# what is the correct coding needed now, please? 

提前致谢和问候

Answer 1

给出列名，而不是索引：

print(br['Time'][3])

顺便说一句，您只能使用以下内容读取数据，并且您可能还需要decimal=','：

import pandas as pd
br = pd.read_csv('/var/log/LM92Temperature_U-20211019.csv', sep=';', decimal=',')
print(br)