csvrearrange.py

#!/usr/bin/env python
import csv

field_order_fh = open('field_order.txt',"r")
field_order_list = field_order_fh.readlines()
field_order_list_stripped=[]
for f in field_order_list:
    field_order_list_stripped.append(f.rstrip('\n'))

with open('my.csv', newline='') as infile:
    reader = csv.DictReader(infile)
    with open("newfile.csv", 'w+', newline='') as outfile:
        writer = csv.DictWriter(outfile, fieldnames=field_order_list_stripped)
        writer.writeheader()
        for row in reader:
            writer.writerow(row)