Merge-all.py

import os
import openpyxl
from pathlib import Path

dir_containing_files = os.getcwd() + '\\data'
# print(dir_containing_files)
# print(type(dir_containing_files))
dest_wb = openpyxl.Workbook()
collectables = []
for root, dir, filenames in os.walk(dir_containing_files):
    for file in filenames:
        print(file)
        xlsx_file = Path(os.getcwd() + '\\data\\' + file)
        wb_obj = openpyxl.load_workbook(xlsx_file)
        sheet = wb_obj.active

        for row in sheet.values:
            collectables.append(row)

sheet = dest_wb.active
for row in collectables:
    sheet.append(row)
dest_wb.save("monthly-data.xlsx")

xlsx-modifier.py

import openpyxl
from pathlib import Path
import datetime
def modifyMyExcelSheet(filename, year, month, day):
    xlsx_file = Path(filename)
    wb_obj = openpyxl.load_workbook(xlsx_file)
    sheet = wb_obj['RawData']
    # print(sheet)

    collectables = []
    for row in sheet.values:
        if 'Total Site Down' not in row:
            collectables.append(list(row))

    # print(len(collectables))
    # print(type(collectables[7][7]))
    may3rd1st = datetime.datetime(year, month, day)
    may3rdlst = datetime.datetime(year, month, day, 23, 59, 59)
    for row in collectables:
        if type(row[9]) is type(may3rdlst):
            if row[9] > may3rdlst:
                row[9] = may3rdlst
        if type(row[7]) is type(may3rd1st):
            if row[7] < may3rd1st:
                row[7] = may3rd1st

    myExport = openpyxl.Workbook()
    mySheet = myExport.active
    for row in collectables:
        myRow = tuple(row)
        mySheet.append(myRow)

    myExport.save('modified - ' + filename)
    print('File saved as - ' + '"modified - ' + filename + '"')

modifyMyExcelSheet('3G_SiteAvailabilityReport_SOC_Day-2_05-05-21.xlsx', 2021, 5, 3)