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Groups > comp.lang.python > #65549

Re: parse a csv file into a text file

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On 2014-02-06, Tim Chase <python.list@tim.thechases.com> wrote:
> On 2014-02-06 17:40, Mark Lawrence wrote:
>> On 06/02/2014 14:02, Neil Cerutti wrote:
>> >
>> > You must open the file in binary mode, as that is what the csv
>> > module expects in Python 2.7. newline handling can be enscrewed
>> > if you forget.
>> >
>> > file = open('raw.csv', 'b')
>> >
>> 
>> I've never opened a file in binary mode to read with the csv module 
>> using any Python version.  Where does it state that you must do
>> this?
>
> While the docs don't currently say anything about it, all the
> examples at [1] use 'rb' or 'wb' when opening the file.  I've
> long wondered about that.  Especially as I've passed non-file
> objects like lists/iterators to the csv.reader/csv.DictReader
> and had them work just fine (and would be a little perturbed if
> they broke).

They do actually mention it.

From: http://docs.python.org/2/library/csv.html

  csv.reader(csvfile, dialect='excel', **fmtparams)

  Return a reader object which will iterate over lines in the
  given csvfile. csvfile can be any object which supports the
  iterator protocol and returns a string each time its next()
  method is called — file objects and list objects are both
  suitable. If csvfile is a file object, it must be opened with
  the ‘b’ flag on platforms where that makes a difference. 

So it's stipulated only for file objects on systems where it
might make a difference.

-- 
Neil Cerutti

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parse a csv file into a text file Zhen Zhang <zhen.zhang.uoft@gmail.com> - 2014-02-05 16:10 -0800
  Re: parse a csv file into a text file Asaf Las <roegltd@gmail.com> - 2014-02-05 16:17 -0800
    Re: parse a csv file into a text file Zhen Zhang <zhen.zhang.uoft@gmail.com> - 2014-02-05 23:56 -0800
  Re: parse a csv file into a text file Roy Smith <roy@panix.com> - 2014-02-05 19:33 -0500
    Re: parse a csv file into a text file Zhen Zhang <zhen.zhang.uoft@gmail.com> - 2014-02-05 23:52 -0800
      Re: parse a csv file into a text file Asaf Las <roegltd@gmail.com> - 2014-02-06 00:15 -0800
        Re: parse a csv file into a text file Asaf Las <roegltd@gmail.com> - 2014-02-06 00:48 -0800
      Re: parse a csv file into a text file MRAB <python@mrabarnett.plus.com> - 2014-02-06 13:16 +0000
        Re: parse a csv file into a text file Rustom Mody <rustompmody@gmail.com> - 2014-02-06 05:20 -0800
  Re: parse a csv file into a text file MRAB <python@mrabarnett.plus.com> - 2014-02-06 00:34 +0000
    Re: parse a csv file into a text file Zhen Zhang <zhen.zhang.uoft@gmail.com> - 2014-02-06 00:01 -0800
  Re: parse a csv file into a text file Tim Chase <python.list@tim.thechases.com> - 2014-02-05 18:46 -0600
    Re: parse a csv file into a text file Asaf Las <roegltd@gmail.com> - 2014-02-05 19:59 -0800
      Re: parse a csv file into a text file Tim Chase <python.list@tim.thechases.com> - 2014-02-05 22:09 -0600
        Re: parse a csv file into a text file Asaf Las <roegltd@gmail.com> - 2014-02-05 20:17 -0800
    Re: parse a csv file into a text file Zhen Zhang <zhen.zhang.uoft@gmail.com> - 2014-02-06 00:07 -0800
      Re: parse a csv file into a text file Tim Chase <python.list@tim.thechases.com> - 2014-02-06 12:49 -0600
  Re: parse a csv file into a text file Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-06 00:50 +0000
  Re:parse a csv file into a text file Dave Angel <davea@davea.name> - 2014-02-05 19:57 -0500
    Re: parse a csv file into a text file Zhen Zhang <zhen.zhang.uoft@gmail.com> - 2014-02-06 00:12 -0800
      Re: parse a csv file into a text file Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-02-06 10:49 +0200
      Re: parse a csv file into a text file Dave Angel <davea@davea.name> - 2014-02-06 06:35 -0500
      Re: parse a csv file into a text file Dave Angel <davea@davea.name> - 2014-02-06 06:53 -0500
  Re: parse a csv file into a text file Terry Reedy <tjreedy@udel.edu> - 2014-02-05 22:01 -0500
  Re: parse a csv file into a text file Neil Cerutti <neilc@norwich.edu> - 2014-02-06 14:02 +0000
  Re: parse a csv file into a text file Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-06 17:40 +0000
  Re: parse a csv file into a text file Tim Chase <python.list@tim.thechases.com> - 2014-02-06 11:51 -0600
  Re: parse a csv file into a text file Tim Golden <mail@timgolden.me.uk> - 2014-02-06 18:05 +0000
  Re: parse a csv file into a text file Neil Cerutti <neilc@norwich.edu> - 2014-02-06 18:34 +0000
  Re: parse a csv file into a text file Tim Chase <python.list@tim.thechases.com> - 2014-02-06 12:51 -0600

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