Decompress bz2 files

bz2.compress/decompress work with binary data:

>>> import bz2>>> compressed = bz2.compress(b'test_string')>>> compressedb'BZh91AY&SYJ|i\x05\x00\x00\x04\x83\x80\x00\x00\x82\xa1\x1c\x00 \x00"\x03h\x840"P\xdf\x04\x99\xe2\xeeH\xa7\n\x12\tO\x8d \xa0'>>> bz2.decompress(compressed)b'test_string'

In short - you need to process file contents manually. In case you have very large files you should prefer using bz2.BZ2Decompressor to bz2.decompress, because the latter requires that you store the entire file in a byte array.

for filename in files:    filepath = os.path.join(dirpath, filename)    newfilepath = os.path.join(dirpath,filename + '.decompressed')    with open(newfilepath, 'wb') as new_file, open(filepath, 'rb') as file:        decompressor = BZ2Decompressor()        for data in iter(lambda : file.read(100 * 1024), b''):            new_file.write(decompressor.decompress(data))

You can also use bz2.BZ2File to make this even simpler:

for filename in files:    filepath = os.path.join(dirpath, filename)    newfilepath = os.path.join(dirpath, filename + '.decompressed')    with open(newfilepath, 'wb') as new_file, bz2.BZ2File(filepath, 'rb') as file:        for data in iter(lambda : file.read(100 * 1024), b''):            new_file.write(data)

bz2.decompress takes compressed data and inflates it. You pass a filename, not the data in the file!

Do this instead:

zipfile = bz2.BZ2File(filepath) # open the filedata = zipfile.read() # get the decompressed datanewfilepath = filepath[:-4] # assuming the filepath ends with .bz2open(newfilepath, 'wb').write(data) # write a uncompressed file

This should work

for file in files:    archive_path = os.path.join(dirpath,filename)    outfile_path = os.path.join(dirpath, filename[:-4])    with open(archive_path, 'rb') as source, open(outfile_path, 'wb') as dest:        dest.write(bz2.decompress(source.read()))