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Hi,

I'm just starting to learn some Python basics and are not familiar with
file handling.
Looking for a python scrip that zips files.
So aaa.xx bbb.yy ccc.xx should be zipped to aaa.zip bbb.zip ccc.zip

I haven't been able to type more than 'import gzip'..

Just a script I need for practical use (zip didn't do the job) and not
for educational purposes.

On Sat, 16 Feb 2008 15:37:16 +0000, T_T wrote:

> Hi,
>
> I'm just starting to learn some Python basics and are not familiar with
> file handling.
> Looking for a python scrip that zips files. So aaa.xx bbb.yy ccc.xx
> should be zipped to aaa.zip bbb.zip ccc.zip
>
> I haven't been able to type more than 'import gzip'..
>
> Just a script I need for practical use (zip didn't do the job) and not
> for educational purposes.

btw. I need it for batch handling, so I want to place the file in a
directory, run it and zip all files in the directory.

Hope someone will be able to help me.

>> I'm just starting to learn some Python basics and are not familiar with
>> file handling.
>> Looking for a python scrip that zips files. So aaa.xx bbb.yy ccc.xx
>> should be zipped to aaa.zip bbb.zip ccc.zip
>>
>> I haven't been able to type more than 'import gzip'..

Well, you ask for zip files, but then import gzip... ?

> btw. I need it for batch handling, so I want to place the file in a
> directory, run it and zip all files in the directory.

>>> import os, zipfile
>>> for fname in os.listdir('.'):
.... basename, ext = os.path.splitext(fname)
.... if ext.lower().endswith('zip'): continue
.... f = zipfile.ZipFile('%s.zip' % basename, 'w')
.... f.write(fname)
.... f.close()
.... print fname
....

seems to do the trick for me.

-tkc

>
> seems to do the trick for me.
>
> -tkc

Thanks! Works indeed. Strange thing is though, the files created are the
exact size as the original file. So it seems like it is zipping without
compression.

> Thanks! Works indeed. Strange thing is though, the files created are the
> exact size as the original file. So it seems like it is zipping without
> compression.


The instantiation of the ZipFile object can take an optional
parameter to control the compression. The zipfile module only
supports storing (the default as you discovered) and "deflation":

f = zipfile.ZipFile(zipfilename, 'w',
compression=zipfile.ZIP_DEFLATED)

You can read more at

http://docs.python.org/lib/zipfile-objects.html

-tkc

> f = zipfile.ZipFile(zipfilename, 'w',
> compression=zipfile.ZIP_DEFLATED)
>
> -tkc

Adding the compression rule works great, thanks again!

On Feb 17, 6:52 am, Tim Chase <python.l...@tim.thechases.com> wrote:
> > Thanks! Works indeed. Strange thing is though, the files created are the
> > exact size as the original file. So it seems like it is zipping without
> > compression.
>
> The instantiation of the ZipFile object can take an optional
> parameter to control the compression. The zipfile module only
> supports storing (the default as you discovered) and "deflation":
>
> f = zipfile.ZipFile(zipfilename, 'w',
> compression=zipfile.ZIP_DEFLATED)
>
> You can read more at
>
> http://docs.python.org/lib/zipfile-objects.html

Confession: An infrequent user of the zipfile module, I've been caught
twice by this strange choice of default argument.

I wonder how many people actually need/want the stored (uncompressed )
format. The select few must surely document that their choice is
deliberate:

f = zipfile.ZipFile(
zipfilename,
mode='w',
compression=zipfile.ZIP_STORED, # no compression
# Yes the above is deliberate.
# See section n.nn of project specs.
)

Suggestion: for the benefit of folk who (unlike the OP and I) do read
the manual, it might help if the text had one paragraph per arg, and
included a warning:
"""
.... also works, and at least WinZip can read such files.

/compression/ is the ZIP compression method to use when writing the
archive, and should be ZIP_STORED or ZIP_DEFLATED. *WARNING:* the
default is ZIP_STORED (no compression). Unrecognized values will cause
RuntimeError to be raised. If ZIP_DEFLATED is specified but the zlib
module is not available, RuntimeError is also raised.

If /allowZip64/ is True ...
"""

Cheers,
John