On 2011-11-21, ray <r...@aarden.us> wrote:
> Is there a way to capture the keys outside of the for loop so
> when the for loop is entered, only data is extracted?
I have sometimes done the following type of thing, since
DictReader doesn't offer an attribute providing the field names.
This is Python 3.3.2 code, so revise boilerplate if necessary.
# Open once as a csv.reader instance to get the field names, in
# order.
with open(in_file_name, newline='') as in_file:
reader = csv.reader(in_file)
fields = next(reader)
# Open it again as a csv.DictReader instance to do actual work,
# writing revised lines to the output file as I go.
with open(in_file_name, newline=') as in_file:
with open(out_file_name, "w", newline='') as out_file:
reader = csv.DictReader(in_file)
writer = csv.DictWriter(out_file, fieldnames=fields)
# Write header line
writer.writerow({f: f for n in fields})
for record in reader:
# Change a few fields
# [...]
writer.writerow(record)
--
Neil Cerutti
"This room is an illusion and is a trap devisut by Satan. Go
ahead and dauntlessly! Make rapid progres!"
--Ghosts 'n Goblins
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