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:[EMAIL PROTECTED] Sent: Thursday, November 20, 2008 02:06 To: python-list@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 <[EMAIL PROTECTED]> 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 -- http://mail.python.org/mailman/listinfo/python-list
