Python 解压 bz2 文件
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Decompress bz2 files
提问by MY_1129
I would like to decompress the files in different directories which are in different routes. And codes as below and the error is invalid data stream. Please help me out. Thank you so much.
我想解压缩不同路径中不同目录中的文件。和代码如下，错误是无效的数据流。请帮帮我。非常感谢。
import sys
import os
import bz2
from bz2 import decompress
path = "Dir"
for(dirpath,dirnames,files)in os.walk(path):
for file in files:
filepath = os.path.join(dirpath,filename)
newfile = bz2.decompress(file)
newfilepath = os.path.join(dirpath,newfile)
回答by Jochen Ritzel
bz2.decompresstakes compressed dataand inflates it. You pass a filename, not the data in the file!
bz2.decompress获取压缩数据并将其膨胀。您传递的是文件名，而不是文件中的数据！
Do this instead:
改为这样做：
zipfile = bz2.BZ2File(filepath) # open the file
data = zipfile.read() # get the decompressed data
newfilepath = filepath[:-4] # assuming the filepath ends with .bz2
open(newfilepath, 'wb').write(data) # write a uncompressed file
回答by michaelmeyer
This should work
这应该工作
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()))
回答by Juraj Ivan?i?
bz2.compress/decompress work with binary data:
bz2.compress/decompress 处理二进制数据：
>>> import bz2
>>> compressed = bz2.compress(b'test_string')
>>> compressed
b'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.BZ2Decompressorto bz2.decompress, because the latter requires that you store the entire file in a byte array.
简而言之 - 您需要手动处理文件内容。如果您有非常大的文件，您应该更喜欢使用bz2.BZ2Decompressorto bz2.decompress，因为后者要求您将整个文件存储在一个字节数组中。
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.BZ2Fileto make this even simpler:
您还可以使用bz2.BZ2File使这更简单：
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)
