How to write content of csv file only to specific column in OpenPyXL, Python?

Question

Python

I am writing a program to write CSV content to xlsx in Python, using the openpyxl module I
found a script on the Internet:
import csv
import openpyxl

wb = openpyxl.Workbook()
ws = wb.active

with open('res.csv') as f:
reader = csv .reader(f, delimiter=',')
for row in reader:
ws.append(row)

wb.save('file.xlsx')

however it only writes content to column A1, how to make the column selectable?