浅谈Python的编译与反编译
1 - Python编译过程涉及的文件
py
源代码文件,由python.exe解释,可在控制台下运行,可用文本编辑器进行编辑;
pyc
源代码文件经过编译后生成的二进制文件,无法用文本编辑器进行编辑;
执行一个.py文件后,并不会自动生成对应的.pyc文件,需要指定触发Python来创建pyc文件;
- pyc是由py文件经过编译后生成的二进制字节码(byte code)文件;
- pyc文件的加载速度比py文件快;
- pyc文件是一种跨平台的字节码,由python的虚拟机来执行;
- pyc文件的内容跟python版本相关,不同的python版本编译生成不同的pyc文件,只能在相同版本环境下执行;
pyo
源代码文件经过优化编译后生成的文件,无法用文本编辑器进行编辑;
Python3.5之后,不再使用.pyo文件名,而是使用类似“xxx.opt-n.pyc的文件名;
pyd
是python的动态链接库;
动态链接库(DLL)文件是一种可执行文件,允许程序共享执行特殊任务所必需的代码和其他资源;
pyd文件虽然是作为python的动态模块,但实质上还是DLL文件,只是后缀改为pyd;
一般是用C、C++、D语言按照一定的格式编写;
参考信息:https://docs.python.org/3/faq/windows.html?highlight=pyd#is-a-pyd-file-the-same-as-a-dll
pyz
从Python 3.5开始,定义了.pyz和.pyzw分别作为“Python Zip应用”和“Windows下Python Zip应用”的扩展名。
新增了内置zipapp模块来进行简单的管理,可以用Zip打包Python程序到一个可执行.pyz文件。
- zipapp — Manage executable python zip archives
-
https://docs.python.org/3/library/zipapp.html
详细内容请见PEP441(https://www.python.org/dev/peps/pep-0441/)
2 - 生成pyc文件
执行一个.py文件后,并不会自动生成对应的.pyc文件,需要指定触发Python来创建pyc文件。
可以利用Python的import机制创建pyc文件:
- 内置的py_compile模块可以把py文件编译为pyc或pyo文件;
- 内置的compileall模块可以把整个目录中的py文件编译为pyc或pyo文件;
生成pyc文件的过程:
Python在执行import语句时(例如“import abc”),将会到已设定的path中寻找abc.pyc或abc.dll文件。
如果只是发现了abc.py,那么Python会首先将abc.py编译成相应的PyCodeObject中间结果,然后创建abc.pyc文件,并将中间结果写入该文件。
然后,Python会import这个abc.pyc文件,实际上也就是将abc.pyc文件中的PyCodeObject重新在内存中复制出来。
生成pyc文件的方法:
命令形式:
python -m py_compile file.py # 生成单个pyc文件
python -m py_compile /dir/{file1,file2}.py # 生成多个pyc文件
python -m compileall /dir/ # 生成目录下所有py文件对应的pyc文件
脚本形式:compile模块的compile函数
'''
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'''
import py_compile # 相当于命令行中的“-m py_compile”
py_compile.compile('py file path')
脚本形式:compileall模块的compile_dir函数
import compileall
compileall.compile_dir("py files dir")
生成pyc文件示例:
'''
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'''
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l
total 2
-rw-r--r-- 1 anliven 197121 50 3月 7 22:55 sample.py
-rw-r--r-- 1 anliven 197121 49 3月 7 23:40 sample2.py
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ cat sample.py
# -*- coding: utf-8 -*-
print("Hello Python !")
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ cat sample2.py
# -*- coding: utf-8 -*-
print("Hello World !")
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ python -m compileall ./
Listing './'...
Compiling './sample.py'...
Compiling './sample2.py'...
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l
total 6
drwxr-xr-x 1 anliven 197121 0 3月 7 23:42 __pycache__/
-rw-r--r-- 1 anliven 197121 50 3月 7 22:55 sample.py
-rw-r--r-- 1 anliven 197121 49 3月 7 23:40 sample2.py
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l __pycache__/
total 2
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample.cpython-36.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample2.cpython-36.pyc
3 - 生成pyo文件
与生成pyc文件类似,但要额外使用-O和-OO选项来生成pyo文件。
但在Python3.5之后,不再使用.pyo文件名,而是生成文件名类似“xxx.opt-n.pyc的文件。
命令示例:
python -O -m py_compile file.py
python -O -m py_compile /dir/{file1,file2}.py
python -O -m compileall /dir/
示例:python3.6生成pyo文件
'''
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'''
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ python -O -m compileall ./
Listing './'...
Compiling './sample.py'...
Compiling './sample2.py'...
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l __pycache__/
total 4
-rw-r--r-- 1 anliven 197121 122 3月 7 23:42 sample.cpython-36.opt-1.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample.cpython-36.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:42 sample2.cpython-36.opt-1.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample2.cpython-36.pyc
示例:python2.7生成pyo文件
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l
total 6
drwxr-xr-x 1 anliven 197121 0 3月 7 23:42 __pycache__/
-rw-r--r-- 1 anliven 197121 50 3月 7 22:55 sample.py
-rw-r--r-- 1 anliven 197121 49 3月 7 23:40 sample2.py
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ py -2 -O -m compileall ./
Listing ./ ...
Listing ./__pycache__ ...
Compiling ./sample.py ...
Compiling ./sample2.py ...
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l
total 8
drwxr-xr-x 1 anliven 197121 0 3月 7 23:42 __pycache__/
-rw-r--r-- 1 anliven 197121 50 3月 7 22:55 sample.py
-rw-r--r-- 1 anliven 197121 122 3月 7 23:45 sample.pyo
-rw-r--r-- 1 anliven 197121 49 3月 7 23:40 sample2.py
-rw-r--r-- 1 anliven 197121 122 3月 7 23:45 sample2.pyo
4 - 运行pyc或pyo文件
运行pyc文件
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ python sample.cpython-36.pyc
Hello Python !
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ python sample2.cpython-36.pyc
Hello World !
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ python sample.cpython-36.opt-1.pyc
Hello Python !
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ python sample2.cpython-36.opt-1.pyc
Hello World !
运行pyo文件
'''
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寻找有志同道合的小伙伴,互帮互助,群里还有不错的视频学习教程和PDF电子书!
'''
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l
total 8
drwxr-xr-x 1 anliven 197121 0 3月 7 23:42 __pycache__/
-rw-r--r-- 1 anliven 197121 50 3月 7 22:55 sample.py
-rw-r--r-- 1 anliven 197121 122 3月 7 23:45 sample.pyo
-rw-r--r-- 1 anliven 197121 49 3月 7 23:40 sample2.py
-rw-r--r-- 1 anliven 197121 122 3月 7 23:45 sample2.pyo
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ py -2 sample.pyo
Hello Python !
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ py -2 sample2.pyo
Hello World !
5 - 利用uncompyle6进行Python反编译
uncompyle6
- Python cross-version byte-code decompiler
- PyPI:https://pypi.python.org/pypi/uncompyle6
- GitHub:https://github.com/rocky/python-uncompyle6
安装uncompyle6
$ pip3 install --proxy="10.144.1.10:8080" uncompyle6
Collecting uncompyle6
Downloading uncompyle6-3.0.0-py36-none-any.whl (195kB)
100% |████████████████████████████████| 204kB 321kB/s
Requirement already satisfied: six in c:\python36\lib\site-packages (from uncompyle6)
Collecting spark-parser<1.9.0,>=1.8.5 (from uncompyle6)
Downloading spark_parser-1.8.5-py36-none-any.whl
Collecting xdis<3.7.0,>=3.6.9 (from uncompyle6)
Downloading xdis-3.6.11-py36-none-any.whl (74kB)
100% |████████████████████████████████| 81kB 153kB/s
Collecting click (from spark-parser<1.9.0,>=1.8.5->uncompyle6)
Using cached click-6.7-py2.py3-none-any.whl
Installing collected packages: click, spark-parser, xdis, uncompyle6
Successfully installed click-6.7 spark-parser-1.8.5 uncompyle6-3.0.0 xdis-3.6.11
$ pip3 show uncompyle6
Name: uncompyle6
Version: 3.0.0
Summary: Python cross-version byte-code decompiler
Home-page: https://github.com/rocky/python-uncompyle6/
Author: Rocky Bernstein, Hartmut Goebel, John Aycock, and others
Author-email: rb@dustyfeet.com
License: MIT
Location: c:\python36\lib\site-packages
Requires: xdis, spark-parser, six
示例:反编译pyc文件
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ ls -l
total 4
-rw-r--r-- 1 anliven 197121 122 3月 7 23:42 sample.cpython-36.opt-1.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample.cpython-36.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:42 sample2.cpython-36.opt-1.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample2.cpython-36.pyc
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ uncompyle6 sample.cpython-36.pyc > s1.py
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ ls -l
total 5
-rw-r--r-- 1 anliven 197121 335 3月 8 00:01 s1.py
-rw-r--r-- 1 anliven 197121 122 3月 7 23:42 sample.cpython-36.opt-1.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample.cpython-36.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:42 sample2.cpython-36.opt-1.pyc
-rw-r--r-- 1 anliven 197121 122 3月 7 23:41 sample2.cpython-36.pyc
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$ cat s1.py
# uncompyle6 version 3.0.1
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.2 (v3.6.2:5fd33b5, Jul 8 2017, 04:57:36) [MSC v.1900 64 bit (AMD64)]
# Embedded file name: ./sample.py
# Compiled at: 2018-03-07 22:55:30
# Size of source mod 2**32: 50 bytes
print('Hello Python !')
# okay decompiling sample.cpython-36.pyc
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test/__pycache__
$
示例:反编译pyo文件
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ ls -l
total 8
drwxr-xr-x 1 anliven 197121 0 3月 8 00:01 __pycache__/
-rw-r--r-- 1 anliven 197121 50 3月 7 22:55 sample.py
-rw-r--r-- 1 anliven 197121 122 3月 7 23:45 sample.pyo
-rw-r--r-- 1 anliven 197121 49 3月 7 23:40 sample2.py
-rw-r--r-- 1 anliven 197121 122 3月 7 23:45 sample2.pyo
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ uncompyle6 sample2.pyo > s2.py
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$ cat s2.py
# uncompyle6 version 3.0.1
# Python bytecode 2.7 (62211)
# Decompiled from: Python 3.6.2 (v3.6.2:5fd33b5, Jul 8 2017, 04:57:36) [MSC v.1900 64 bit (AMD64)]
# Embedded file name: ./sample2.py
# Compiled at: 2018-03-07 23:40:22
print 'Hello World !'
# okay decompiling sample2.pyo
anliven@DESKTOP-68OFQFP MINGW64 /d/Anliven/Anliven-Code/Test
$
uncompyle6的帮助信息
$ uncompyle6 --help
Usage:
uncompyle6 [OPTIONS]... [ FILE | DIR]...
uncompyle6 [--help | -h | --V | --version]
Examples:
uncompyle6 foo.pyc bar.pyc # decompile foo.pyc, bar.pyc to stdout
uncompyle6 -o . foo.pyc bar.pyc # decompile to ./foo.pyc_dis and ./bar.pyc_dis
uncompyle6 -o /tmp /usr/lib/python1.5 # decompile whole library
Options:
-o <path> output decompiled files to this path:
if multiple input files are decompiled, the common prefix
is stripped from these names and the remainder appended to
<path>
uncompyle6 -o /tmp bla/fasel.pyc bla/foo.pyc
-> /tmp/fasel.pyc_dis, /tmp/foo.pyc_dis
uncompyle6 -o /tmp bla/fasel.pyc bar/foo.pyc
-> /tmp/bla/fasel.pyc_dis, /tmp/bar/foo.pyc_dis
uncompyle6 -o /tmp /usr/lib/python1.5
-> /tmp/smtplib.pyc_dis ... /tmp/lib-tk/FixTk.pyc_dis
-c <file> attempts a disassembly after compiling <file>
-d print timestamps
-p <integer> use <integer> number of processes
-r recurse directories looking for .pyc and .pyo files
--fragments use fragments deparser
--verify compare generated source with input byte-code
--verify-run compile generated source, run it and check exit code
--weak-verify compile generated source
--linemaps generated line number correspondencies between byte-code
and generated source output
--help show this message
Debugging Options:
--asm -a include byte-code (disables --verify)
--grammar -g show matching grammar
--tree -t include syntax tree (disables --verify)
Extensions of generated files:
'.pyc_dis' '.pyo_dis' successfully decompiled (and verified if --verify)
+ '_unverified' successfully decompile but --verify failed
+ '_failed' decompile failed (contact author for enhancement)