CSV合并并向每个文件的每一列添加新行

Question

I have bunch of files and file standard goes like

TestAP300
TestBP300
TestCP300
...
TestHP30

For Example:

Data A: 

"-0.9148","-1.7609","0.8441","-3.0872"
"-2.4155","-0.7446","0.7238","-1.5506"

Data B: 

"-0.2695","0.2271","0.7103","-4.7732"
"-0.5421","-0.6235","0.2131","-3.3143"

I would like to create file below :

"-0.9148","-1.7609","0.8441","-3.0872","A"
"-2.4155","-0.7446","0.7238","-1.5506","A"
"-0.2695","0.2271","0.7103","-4.7732","B"
"-0.5421","-0.6235","0.2131","-3.3143","B"

Each files has 10 columns and 4 rows. I would like to merge files in only one file and adding new row to each column.

Thanks in Advance

Answer 1

Input files:

a.csv:

"-0.9148","-1.7609","0.8441","-3.0872"
"-2.4155","-0.7446","0.7238","-1.5506"

b.csv:

"-0.2695","0.2271","0.7103","-4.7732"
"-0.5421","-0.6235","0.2131","-3.3143"

Solution:

import os
import glob
import csv
import pandas as pd

files = glob.glob(r'D:\temp\.data\43055344\*.csv')

pd.concat(
    [pd.read_csv(files[0], header=None).assign(f=os.path.basename(os.path.splitext(f)[0]))
     for f in files
    ],
    ignore_index=True
).to_csv(r'd:/temp/out.csv', header=None, index=False, quoting=csv.QUOTE_ALL)

Result:

"-0.9148","-1.7609","0.8441","-3.0872","a"
"-2.4155","-0.7446","0.7238","-1.5506","a"
"-0.9148","-1.7609","0.8441","-3.0872","b"
"-2.4155","-0.7446","0.7238","-1.5506","b"