[Jython-users] Problem with Zipfile in mode "a"

[Dan W. <d4...@ho...>]

Hi,

I have been trying to use zipfile.ZipFile() with mode="a" to add files to an 
archive.

However when I try to perform a write, each file simply overwrites the 
previous one.

I have tried exactly the same code in Python 2.2 and it works differently. 
For instance, in Jython, opening a non-existent zip file with mode="a" 
creates the file, whereas a runtime error is generated if you perform the 
same action in Python, which requires the file to be present. If I create 
the file, open it with mode="a" and write files to the archive, this works 
fine with Python.

Perhaps someone out there can verify that this is indeed a bug, or perhaps I 
am doing somthing wrong.

I have attached some code to explain below.

import zipfile

#File c:\\test.zip does not exist...
file = zipfile.ZipFile("c:\\test.zip", mode="a")

#Above, if done in Python, creates a runtime error!

#Add first file to archive
file.write("c:\\test1.txt")

#Add second file to archive
file.write("c:\\test2.txt")

file.close()

#Oh dear, appears that archive now just consists of c:\\test2.txt


Dan.

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