我需要从多个 csv 文件名中捕获日期，并使用 Python 在每个文件中将该日期添加为新列

Question

I need to capture date from multiple csv filenames and add that date in each file as a new column using Python, I have this code that works well with Excel files and I am trying to do exactly the same with CSV files, If someone could help me that would be much appreciated.

Filenames are as following... Scan_05-22-2021.csv Scan_05-23-2021.csv Scan_05-24-2021.csv and so on..

Excel code that works..

import openpyexcel
import os
import pandas as pd
import glob
import csv

from openpyexcel import load_workbook
import os

path_to_xls = os.getcwd() # or r'<path>'

for xls in os.listdir ('C:\Python'):
    if xls.endswith(".csv") or xls.endswith(".xlsx"):
        f = load_workbook(filename=xls)
        sheet = f.active
        # Change here the name of the new column
        sheet.cell(row=1, column=25).value = "DateTest"
        for i in range(sheet.max_row-1):
            #xls.split('_')[1][:-5]    #kaes value of Col1 and dumps/overwrites in column 3
            sheet.cell(row=i+2, column=25).value = xls.split('_')[1][:-5]

                f.save(xls)
                f.close()

Answer 1

You should be able to do this with pandas

use pd.read_csv to load the files as DataFrames you can use the iterrows method to go ever rows and simply append to the new file.

this cheatsheet could be of use

Good luck!