[Tutor] gzip file close

David Rock david at graniteweb.com
Tue Aug 10 21:02:54 CEST 2004

I am trying to use the gzip module to open files for reading data, but I
think I am having a problem with using it with non-gzipped files. What I
want to do is pass a wordlist of filenames, some gzipped, some not on
the commandline and have the program make the distiction between the
two, but I get the following results:

$parse_bpimagelist.py -m esdgp1 esdgp1.0408061210.bpimagelist.gz esdgp1.0408091210.bpimagelist 

Traceback (most recent call last):
  File "/home/drock/parse_bpimagelist.py", line 235, in ?
    d = getdata( file )
  File "/home/drock/parse_bpimagelist.py", line 36, in getdata
    buffer = fp_input.readline()
  File "/usr/lib/python2.3/gzip.py", line 379, in readline
    c = self.read(readsize)
  File "/usr/lib/python2.3/gzip.py", line 224, in read
  File "/usr/lib/python2.3/gzip.py", line 260, in _read
  File "/usr/lib/python2.3/gzip.py", line 161, in _read_gzip_header
    raise IOError, 'Not a gzipped file'
IOError: Not a gzipped file

The first file is gzipped, the second is not. The try block I am trying to use looks like this:
        fp_input = gzip.open( inputfile, 'rb' )
        fp_input = open( inputfile, 'rb' )

The idea was that if the file is not gzipped, it would do the second
file open instead. One thing I found in the documentation is that gzip's
close() method doesn't close the gzipped file, but I don't understand
what that means. I don't think that's the issue because even if the
non-gzipped file is listed first, it still doesn't work. I thought maybe
it was because the close() operation wasn't working properly, but I
don't see evidence to support that.

Is it possible that the exception is NOT getting handled properly?


David Rock
david at graniteweb.com
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