Python - writing to a .csv file

Dear Experts,

I have a small Excel file with the data as it the below print screen shows:

which are imported by Python through a .csv file by the following code:

import csv

with open(r"C:\Users\ac324485\Downloads\Daily files\File.csv") as csvfile:
    rows = list(csv.reader(csvfile))
    data_header = rows[0]
    data_rows = rows[1:]
    
for x in data_header:
    print(x)
    
for x in data_rows:
    print(x)

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Could you please advise which Python syntax could write back data to that Excel file to cell A2 (so to the place of value '10101')?

Thanks in advance,