python py7zr 模块问题

Question

使用python 解压7z 压缩包
已安装py7zr ：pip install py7zr

python代码如下

import py7zr
import os
with py7zr.SevenZipFile('result.7z', mode='r',password='1234') as z:
 z.extractall()

运行代码，报错较多

PS G:\python\test> & D:/python3.6/python.exe g:/python/test/web.py
Traceback (most recent call last):
  File "D:\python3.6\lib\site-packages\bcj\__init__.py", line 12, in <module>
    from ._bcj import (
ModuleNotFoundError: No module named 'bcj._bcj'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\python3.6\lib\site-packages\bcj\__init__.py", line 28, in <module>
    from ._bcjfilter import (
ImportError: cannot import name 'IA64Decoder'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "g:/python/test/web.py", line 1, in <module>
    import py7zr
  File "D:\python3.6\lib\site-packages\py7zr\__init__.py", line 45, in <module>
    from py7zr.py7zr import ArchiveInfo, FileInfo, SevenZipFile, is_7zfile, pack_7zarchive, unpack_7zarchive
  File "D:\python3.6\lib\site-packages\py7zr\py7zr.py", line 44, in <module>
    from py7zr.archiveinfo import Folder, Header, SignatureHeader
  File "D:\python3.6\lib\site-packages\py7zr\archiveinfo.py", line 36, in <module>
    from py7zr.compressor import SevenZipCompressor, SevenZipDecompressor
  File "D:\python3.6\lib\site-packages\py7zr\compressor.py", line 32, in <module>
    import bcj  # type: ignore  # noqa
  File "D:\python3.6\lib\site-packages\bcj\__init__.py", line 44, in <module>
    raise ImportError(msg)
ImportError: pybcj module: Neither C implementation nor Python implementation can be imported.

我去dos窗口尝试了 py7zr命令，依然报错

D:\python3.6\Scripts>py7zr.exe
Traceback (most recent call last):
  File "d:\python3.6\lib\site-packages\bcj\__init__.py", line 12, in <module>
    from ._bcj import (
ModuleNotFoundError: No module named 'bcj._bcj'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "d:\python3.6\lib\site-packages\bcj\__init__.py", line 28, in <module>
    from ._bcjfilter import (
ImportError: cannot import name 'IA64Decoder'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "d:\python3.6\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "d:\python3.6\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\python3.6\Scripts\py7zr.exe\__main__.py", line 4, in <module>
  File "d:\python3.6\lib\site-packages\py7zr\__init__.py", line 45, in <module>
    from py7zr.py7zr import ArchiveInfo, FileInfo, SevenZipFile, is_7zfile, pack
_7zarchive, unpack_7zarchive
  File "d:\python3.6\lib\site-packages\py7zr\py7zr.py", line 44, in <module>
    from py7zr.archiveinfo import Folder, Header, SignatureHeader
  File "d:\python3.6\lib\site-packages\py7zr\archiveinfo.py", line 36, in <modul
e>
    from py7zr.compressor import SevenZipCompressor, SevenZipDecompressor
  File "d:\python3.6\lib\site-packages\py7zr\compressor.py", line 32, in <module
>
    import bcj  # type: ignore  # noqa
  File "d:\python3.6\lib\site-packages\bcj\__init__.py", line 44, in <module>
    raise ImportError(msg)
ImportError: pybcj module: Neither C implementation nor Python implementation ca
n be imported.

初入python，百度许久没有结果过……

Answer 1

找到方法了，py7zr 支持以下算法 ，这里报错是提示没有 BCJ这个算法模块，
直接安装就可以了：pip install bcj-cffi

compress
LZMA2

LZMA

Bzip2

Deflate

Copy

PPMd

Zstandard

crypt
7zAES

Filters
Delta

BCJ(X86,ARMT,ARM,PPC,SPARC,IA64)