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RE: Why is try...except in my code not working (gzip/text files) ?

P: n/a
Thanks Gabriel,
Okay, I get it: I was under the impression that the format check would be done on the open.
Bye,
Ron.

-----Original Message-----
From: Gabriel Genellina [mailto:ga*******@yahoo.com.ar]
Sent: Thursday, November 20, 2008 02:06
To: py*********@python.org
Subject: Re: Why is try...except in my code not working (gzip/text files) ?

En Wed, 19 Nov 2008 13:25:03 -0200, Barak, Ron <Ro*******@lsi.com>
escribió:
I need to read a file that is either a gzip or a text file (on both
*nix and Windows).
Since I didn't find a way to determine a file type, I thought of using
the following:

import gzip

FILE = "../dpm/save_state-ssp8400-F0023209_080723-110131/top.1"
#FILE =
"../dpm/save_state-ssp8400-F0023209_080723-110131/var/log/sac.log.0.gz"

try:
file = gzip.GzipFile(FILE, "r") except IOError:
file = open(FILE, "r")

print file.read()
Strangely, when FILE is a gzip file, all is fine.
But, when FILE is a text file (as in the above code), I get the
following:

$ python ./gzip_try.py
Traceback (most recent call last):
File "./gzip_try.py", line 11, in <module>
print file.read() <<<===================
File "c:\Python25\lib\gzip.py", line 220, in read
self._read(readsize)
File "c:\Python25\lib\gzip.py", line 263, in _read
self._read_gzip_header()
File "c:\Python25\lib\gzip.py", line 164, in _read_gzip_header
raise IOError, 'Not a gzipped file'
IOError: Not a gzipped file

Can you explain why the try...except in my code does not work ?
Or, back to my original problem: how do I deal with a file whether
it's a text file or a gzip file ?
Note *where* the exception is raised. Until something is actually read, no check is made for the file format.

--
Gabriel Genellina
Nov 20 '08 #1
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