Zipfile In Python Produces Not Quite Normal ZIP Files

In my project set of files are created and packed to ZIP archive to be used at Android mobile phone. Android application is opening such ZIP files for reading initial data and then

Solution 1:

Based on the differences listed in UPDATE 2 of Question and examples from other question about zipfile, I have tried the following code to add directories to ZIP file and check the result:

# make zip
try:
    with zipfile.ZipFile(prefix + '.zip', 'w', zipfile.ZIP_DEFLATED) as zipf:
        info = zipfile.ZipInfo(prefix+'\\')
        zipf.writestr(info, '')
        for root, dirs, files in os.walk(prefix):
            for d in dirs:
                info = zipfile.ZipInfo(os.path.join(root, d)+'\\')
                zipf.writestr(info, '')
            for file in files:
                zipf.write(os.path.join(root, file))
    # remove dir, that was packed
    shutil.rmtree(prefix)
    # Report about resulting
    print('File ' + prefix + '.zip was created')
except:
    print('Unexpected error occurred while creating file ' + prefix + '.zip')
# Check zip content
with closing(zipfile.ZipFile(prefix + '.zip')) as zfile:
    for info in zfile.infolist():
        print(info.filename)
        print('  (extra = ' + str(info.extra) + '; compress_type = ' + str(info.compress_type) + ')')
print('Values for compress_type:')
print(str(zipfile.ZIP_DEFLATED) + ' = ZIP_DEFLATED')
print(str(zipfile.ZIP_STORED) + ' = ZIP_STORED')

Output is

File en_US_00001.zip was created
en_US_00001/
    (extra = b''; compress_type = 0)
en_US_00001/en_US_00001_0001/
    (extra = b''; compress_type = 0)
en_US_00001/en_US_00001_0002/
    (extra = b''; compress_type = 0)
en_US_00001/en_US_00001_0003/
    (extra = b''; compress_type = 0)
en_US_00001/en_US_00001_0001/en_US_00001_0001_big.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0001/en_US_00001_0001_info.xml
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0001/en_US_00001_0001_small.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0001/en_US_00001_0001_source.pkl
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0001/en_US_00001_0001_source.tex
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0001/en_US_00001_0001_user.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0002/en_US_00001_0002_big.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0002/en_US_00001_0002_info.xml
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0002/en_US_00001_0002_small.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0002/en_US_00001_0002_source.pkl
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0002/en_US_00001_0002_source.tex
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0002/en_US_00001_0002_user.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0003/en_US_00001_0003_big.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0003/en_US_00001_0003_info.xml
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0003/en_US_00001_0003_small.png
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0003/en_US_00001_0003_source.pkl
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0003/en_US_00001_0003_source.tex
    (extra = b''; compress_type = 8)
en_US_00001/en_US_00001_0003/en_US_00001_0003_user.png
    (extra = b''; compress_type = 8)
Values for compress_type:
8 = ZIP_DEFLATED
0 = ZIP_STORED

Adding slash to directory names (+'\\' or +'/') appeared mandatory.

And the most important thing - now ZIP file is properly accepted by Android Application.