Ahmed, Shakir wrote:
Thanks once again and you are right I am trying to unzip in the network
share drive. here is the script now: If I am doing any wrong. :
## code start here
import zipfile
import os
import time
dir1 = "T:\\applications\\tst\\py\\Zip_Process"
test = '%s/shp'%dir1
os.chdir(test)
cwd = os.getcwd()
print cwd
CHUNK_SIZE = 10 * 1024 * 1024
fn = open('T:\\applications\\tst\\py\\Zip_Process\\Zip\\myzip.zip',
'rb')
z = zipfile.ZipFile(fn)
for name in z.namelist():
ptr = 0
data = z.read(name)
size = len(data)
print size
print ptr
while ptr < size:
fn.write(data[ptr:ptr+CHUNK_SIZE])
ptr += CHUNK_SIZE
fn.close()
#Code done here.
But got error as follows:
T:\applications\tst\py\Zip_Process\shp
59160
0
Traceback (most recent call last):
File
"C:\Python25\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py"
, line 325, in RunScript
exec codeObject in __main__.__dict__
File "t:\scratch\shahmed\test2_new.py", line 24, in <module>
fn.write(data[ptr:ptr+CHUNK_SIZE])
IOError: [Errno 9] Bad file descriptor
I didn't notice this in your last post, but you are using fn as both the
zipfile name and the name of the file you are writing to. You'll need
to create the file you want to write before you write to it (plus any
intermediate directories).
Here's the (slightly stripped) version I actually use:
8<--------------------------------------------------------------------
import os
from zipfile import ZipFile
def retrieve_files(zipped, destination, files=None):
"retrieves files from <zipped>"
CHUNK_SIZE = 10 * 1024 * 1024
try:
os.makedirs(destination)
except WindowsError:
pass
target = ZipFile(zipped, 'r')
stored = dict([(k.filename.lower(), k.filename) for k in
target.infolist()])
if files is None:
files = [member.filename.lower() for member in target.infolist()]
elif isinstance(files, (str, unicode)):
files = [files.lower()]
else:
files = [f.lower() for f in files]
for compressed_file in files:
uncompressed_file = os.path.join(destination, compressed_file)
path, filename = os.path.split(uncompressed_file)
if not os.path.exists(path):
os.makedirs(path)
if filename == '__empty__':
continue
data = target.read(stored[compressed_file])
fn = open(uncompressed_file, 'wb')
ptr = 0
size = len(data)
while ptr < size:
fn.write(data[ptr:ptr+CHUNK_SIZE])
ptr += CHUNK_SIZE
fn.close()
target.close()
8<--------------------------------------------------------------------
I convert all filenames to lower case since MS Windows doesn't care, but
Python does.
The test for filename == '__empty__': when I create the zipfile, if the
directory is empty I store a 0-length file named '__empty__' in that
subdirectory (actually, it only happens in the zipfile) so that I can
get the directory back later.
Hope this helps.
~Ethan~
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