7zip - python extract uncompressed data from 7z-file -


i have several csv-files, of compressed others not, in 7z archive. want read csv files , save content in database. however, whenever py7zlib attemts read data csv file not compressed, error data error during decompression.

import os import py7zlib  scr = r'y:\pathtoarchive' z7file = 'archivename.7z'  open(os.path.join(scr,z7file),'rb') f:     archive = py7zlib.archive7z(f)      names = archive.filenames      mem in names:          obj = archive.getmember(mem)         print obj.compressed  # prints none uncompressed data         try:             data = obj.read()         except exception er:             print er          # prints data error during decompression                               # whenever obj.compressed none

the error happens in 

file "c:\anaconda\lib\site-packages\py7zlib.py", line 608, in read data = getattr(self, decoder)(coder, data, level) file "c:\anaconda\lib\site-packages\py7zlib.py", line 671, in _read_lzma return self._read_from_decompressor(coder, dec, input, level, checkremaining=true, with_cache=true) file "c:\anaconda\lib\site-packages\py7zlib.py", line 646, in _read_from_decompressor tmp = decompressor.decompress(data) valueerror: data error during decompression

so, how can extract uncompressed data 7z-archive?

though couldn't figure out problem seemed be, found workaround solved ultimate goal obtain data csv-files 7z-archive. 7-zip comes command line tool. communicating tool via subprocess module, automatically extract files wihsed extract without problems

import subprocess import py7zlib   archiveman = r'c:\program files\7-zip\7z' # 7z.exe comes 7-zip archivepath = r'c:\path\to\archive.7z'  open(archivepath,'rb') f:     archive = py7zlib.archive7z(f)     names = archive.filenames     name in names:         _ = subprocess.check_output([archiveman, 'e', archivepath, '-o{}'.format(r'c:\destination\of\copy'), name])

the different commands can used 7z can found here.


-

Comments

Post a Comment

Popular posts from this blog

scala - 'wrong top statement declaration' when using slick in IntelliJ -

Image
i'm porting project scala 2.9 2.10, therefore have use slick instead of scalaquery. i'm using slick 2.1.0 since supports ms access. according this tutorial , upgrade guide changed robs object class , added val robs : why error message wrong top statement declaration , how rid of it? edit: i'm new scala... according this question seems can't put val outside of methods or classes, right? code above directly in packge. right approach slick then? should move code in class or trait? according this changed val robs = tablequery[robs] to object robs extends tablequery(new robs(_)) {} . no warnings or errors anymore. :)
Read more

c# - DevExpress.Wpf.Grid.InfiniteGridSizeException was unhandled -

Image
when using devexpress, see error: devexpress.wpf.grid.infinitegridsizeexception unhandled message="by default, infinite grid height not allowed since grid rows rendered , hence grid work slowly. fix issue, should place grid container give finite height grid, or should manually specify grid's height or maxheight. note can avoid exception setting gridcontrol.allowinfinitegridsize static property true, in case grid run slowly." the problem dxgrid has infinite height. to fix, set height non-infinite. snoop absolutely invaluable this: if "height" xaml element infinite (i.e. 0 or nan ), can set using one of following: option 1: height="{binding path=actualheight, relativesource={relativesource mode=findancestor, ancestortype=uielement}}" option 2: verticalalignment="stretch" option 3: height="auto" hint: use verticalalignment="stretch" if child of grid <rowdefinition height=
Read more

PySide and Qt Properties: Connecting signals from Python to QML -

i trying run simple pyside appliccation design made in qml. call function in qml python in separated thread. i have following qml view: import qt 4.7 rectangle { visible: true width: 100; height: 100 color: "lightgrey" text { id: datestr objectname: "datestr" x: 10 y: 10 text: "init text" font.pixelsize: 12 function updatedata(text) { datestr.text = qstr(text) console.log("you said: " + text) } } } here application: some imports.... #!/usr/bin/python import sys import time pyside import qtdeclarative, qtcore pyside.qtgui import qapplication pyside.qtdeclarative import qdeclarativeview the qthread worker.... #worker thread class worker(qtcore.qthread): updateprogress = qtcore.signal(int) def __init__(self, child): qtcore.qthread.__init__(self) self.child = child def run(self):
Read more