module: zipfile.writestr - line endings issue

Suresh Babu Kolla kollasb+news at
Wed Aug 15 09:33:17 CEST 2007

Paul Carter wrote:
> On Aug 14, 1:32 pm, towers <damondo... at> wrote:
>> Thanks - your code works for me also.
>> But I still get the issue when I read the file directly and add it to
>> the archive.
>> Say if I:
>> 1. Use the test.csv file created with your code - currently the line
>> endings look good (viewed in notepad on Win XP)
>> 2. Run the following code:
>> # begin code
>> import zipfile
>> import os.path
>> # Now, create the zipfile
>> dfile = open('test.csv', 'r')
>> zip_file = zipfile.ZipFile(r'C:\temp\ice\line endings\', 'w',
>> zipfile.ZIP_DEFLATED)
>> zip_file.writestr('test.csv',
>> dfile.close()
>> zip_file.close()
>> 3. Then extract the file and the file endings have been corrupted. Now
>> one long line in notepad. (Other programs interpret correctly though.)
>> Maybe the issue lies with this way (i.e. of writing the
>> file to the archive...possibly.
>> Damon
> Please don't top post.
> The problem is with how you are opening the file. You need to open in
> binary mode if you wish to read your file unaltered. Also, file() is
> preferred over open() these days I think. Use:
> dfile = file('test.csv', 'rb')

 From Python 2.5 library documentation.

      When opening a file, it's preferable to use `open()' instead of
      invoking this constructor directly.  `file' is more suited to type
      testing (for example, writing `isinstance(f, file)').

Python documentation seem to recommend using open(). I personally prefer
to use open, just because python open has same signature as POSIX open, 
even beginner programmers can understand the intent of the code clearly.


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