Why is try...except in my code not working (gzip/text files) ?
gagsl-py2 at yahoo.com.ar
Thu Nov 20 01:05:57 CET 2008
En Wed, 19 Nov 2008 13:25:03 -0200, Barak, Ron <Ron.Barak at lsi.com>
> 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 =
> 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
> $ 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
> File "c:\Python25\lib\gzip.py", line 263, in _read
> 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.
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