[Tutor] Fw: Reading gzip files

[Dinesh B Vadhia]

Hi!  I sent the note below earlier and thank-you for the various responses.  The program reads a bunch of gzip files, writes the content out to a text file line by line (see code below).

What I'd like to do is ... when an "IOError: CRC check failed" error happens then close the offending file and move on to the next file in the list.  How do I achieve this with this particular type of error?

Dinesh




From: Dinesh B Vadhia 
Sent: Sunday, November 30, 2008 2:51 PM
To: tutor at python.org 
Subject: Reading gzip files


I'm reading gzip files and writing the content out to a text file line by line.  The code is simply:

import gzip
list_zipfiles  = dircache.listdir(zipfolder)
writefile = "out_file.txt"
fw = open(writefile, 'w')

for ziparchive in list_zipfiles:
    zfile = gzip.GzipFile(zipfolder + ziparchive, "r")
    for line in zfile:
        fw.write(line)
    zfile.close()
fw.close()

The Traceback is:
Traceback (most recent call last):
  File "....py", line 47, in <module>
    for line in zfile:
  File "C:\Python25\lib\gzip.py", line 444, in next
    line = self.readline()
  File "C:\Python25\lib\gzip.py", line 399, in readline
    c = self.read(readsize)
  File "C:\Python25\lib\gzip.py", line 227, in read
    self._read(readsize)
  File "C:\Python25\lib\gzip.py", line 275, in _read
    self._read_eof()
  File "C:\Python25\lib\gzip.py", line 311, in _read_eof
    raise IOError, "CRC check failed"
IOError: CRC check failed

I've checked the Python docs and online but cannot find a solution to the problem.  Thanks.

Dinesh

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