Screwing Up looping in Generator

Deborah Swanson python at deborahswanson.net
Tue Jan 3 15:06:43 EST 2017


Sayth Renshaw wrote, on January 03, 2017 6:54 AM
> 
> 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

What's the code for your generator? And I don't see where you call
'next'.



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