7zip

I want to use PyLZMA to extract a file from an archive (e.g. test.7z) and extract it to the same directory. I'm a newbie to Python and have no idea how to start. I've done some googling and found some examples and docs , but I don't understand how they work. Could someone please post the basic code for what I want to do so that I can start to work and understand? Brian B Here is a Python class to handle the basic functionality. I have used it for my own work: import py7zlib class SevenZFile(object): @classmethod def is_7zfile(cls, filepath): ''' Class method: determine if file path points to a

I would like to read (in Python 2.7), line by line, from a csv (text) file, which is 7z compressed. I don't want to decompress the entire (large) file, but to stream the lines. I tried pylzma.decompressobj() unsuccessfully. I get a data error. Note that this code doesn't yet read line by line: input_filename = r"testing.csv.7z" with open(input_filename, 'rb') as infile: obj = pylzma.decompressobj() o = open('decompressed.raw', 'wb') obj = pylzma.decompressobj() while True: tmp = infile.read(1) if not tmp: break o.write(obj.decompress(tmp)) o.close() Output: o.write(obj.decompress(tmp))

I'm trying to automate the extraction of a number of files compressed with 7-zip. I need to automate this process, because a) there are many years of data I'd like to unlock and b) I'd like to share my code with others and prevent them from repeating the process by hand. I have both WinRAR and 7-zip installed on my computer, and I can individually open these files easily with either program. I've looked around at the unzip untar and unz commands, but I don't believe any of them do what I need. I don't know anything about compression, but if it makes any difference: each of these files only

I normally compress using tar zcvf and decompress using tar zxvf (using gzip due to habit). I've recently gotten a quad core CPU with hyperthreading, so I have 8 logical cores, and I notice that many of the cores are unused during compression/decompression. Is there any way I can utilize the unused cores to make it faster? Mark Adler You can use pigz instead of gzip, which does gzip compression on multiple cores. Instead of using the -z option, you would pipe it through pigz: tar cf - paths-to-archive | pigz > archive.tar.gz By default, pigz uses the number of available cores, or eight if it

http://www.7-zip.org/sdk.html This site provide a LZMA SDK for compress/decompress files, I would like to give it a shot but I am lost. Anyone got experience on this? Or a tutorial? Thanks. Short answer: don't The 7zip sdk is old and unmaintained and it's just a JNI wrapper around the C++ library. A pure Java implementation on a modern JVM (1.7+) is as fast as a C++ one and has less dependecies and portability issues. Have a look at http://tukaani.org/xz/java.html XZ is a file format based on LZMA2 (an improved version of LZMA) The guys that invented the XZ format build a pure java

I have a program (written in C#) that reads/writes its data directly (direct file access without server) to firebird database files. For a better exchange I want to (un)compress them on import/export for a better exchange over the internet without the need of an external program to (un)compress them. I know #ziplib which supports Zip, GZip, Tar and BZip2. What else free compression libraries for C# do you know? Is there a .NET library which supports LZMA so i can read/write ".7z" files? splattne There is a good article written by Peter Bromberg: 7Zip (LZMA) In-Memory Compression with C# Shows