i am want to read data from the csv that i wrote using python csv module but apart from filed names and row count i am unable to read rest of the data

Peter Otten __peter__ at web.de
Wed Apr 15 04:28:04 EDT 2020


sjeik_appie at hotmail.com wrote:

>    On 12 Apr 2020 12:30, Peter Otten <__peter__ at web.de> wrote:
> 
>      Rahul Gupta wrote:
> 
>      >for line in enumerate(csv_reader):
>      >print(line[csv_reader.fieldnames[1]])
> 
>      enumerate() generates (index, line) tuples that you need to unpack:
> 
>      for index, line in enumerate(csv_reader):
>      print(line[csv_reader.fieldnames[1]])
> 
>    ==》 Shouldn't that be, e.g:
>    print( line[csv_reader.fieldnames[1].index()] )

No. Remember that the OP used a DictReader. If you want to clean up the 
original code you can use a csv.reader

csv_reader = csv.reader(csv_file)
fieldnames = next(csv_reader)
for row in csv_reader:
    print(row[1])

but my assumption was that

>      print(line[csv_reader.fieldnames[1]])

wasn't the final code, only something to get things working.

>    Or maybe:
>    cols = csv_reader.fieldnames
>    print( [[val for val, col in zip(record, cols) if col in ['somecol']]
>    for record in csv_reader])
>    ?

This is ugly and complex. It can be simplified to

num_rows = sum(1 for _ in csv_reader)
print([["somecol"]] * num_rows)

Why would you want to do this?



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