Screwing Up looping in Generator

Tue Jan 3 09:54:25 EST 2017

Hi
This is simple, but its getting me confused.
I have a csv writer that opens a file and loops each line of the file for each file and then closes, writing one file.
I want to alter the behaviour to be a written file for each input file. I saw a roundrobin example however it failed for me as you cannot get len(generator) to use a while loop on.
it exhausts
should I use the same for again after the with open?
rootobs in this code is my generator and I am already looping it however 
def data_attr(roots):
 """Get the root object and iter items."""
 for file in rootobs:
 base = os.path.basename(file.name)
 write_to = os.path.join("output", os.path.splitext(base)[0] + ".csv")
 with open(write_to, 'w', newline='') as csvf:
 race_writer = csv.writer(csvf, delimiter=',')
 race_writer.writerow(
 ["meet_id", "meet_venue", "meet_date", "meet_rail",
 ...
 # other categories here
 ...
 "jockeysurname", "jockeyfirstname"])
 for xml_data in roots:
 ...
 # parsing code
 for noms in race_child:
 if noms.tag == 'nomination':
 race_writer.writerow(
 [meet_id, meet_venue, meet_date,
 ...
 #parsing info removed
 noms.get("jockeyfirstname")])
Cheers
Sayth