uncompyle – A Python 2.7 byte-code decompiler

缘起

本想清理代码中的 pyc 文件，不想少打了 c，导致所有的源文件被清空，还好是个 demo，代码不多，并且 pyc 还存在，在懒得重新写时，想起来是否可以反编译 pyc 文件。

针对 py2.7 生成的代码，通过试用各个反编译的工具，最后发现 uncompyle 比较好用

‘uncompyle’ converts Python byte-code back into equivalent Python source. It accepts byte-code from Python version 2.7 only.

The generated source is very readable: docstrings, lists, tuples and hashes get pretty-printed.

Install

git clone https://github.com/gstarnberger/uncompyle.git
cd uncompyle/
python setup.py install

Usage

uncompyler.py -h

DEMO

$ more quick_sort.py
#-*- coding: utf-8 -*-


def qsort1(list):
    """
    Quicksort using list comprehensions
    >>> qsort1<<docstring test numeric input>>
    <<docstring test numeric output>>
    >>> qsort1<<docstring test string input>>
    <<docstring test string output>>
    """
    if list == []:
        return []
    else:
        pivot = list[0]
        lesser = qsort1([x for x in list[1:] if x < pivot])
        greater = qsort1([x for x in list[1:] if x >= pivot])
        return lesser + [pivot] + greater


if __name__ == '__main__':
    import random
    a = [random.randint(0, 100) for i in range(10)]
    a = qsort1(a)
    print a

当这个代码被删除后，但保留有其 pyc 文件: quick_sort.pyc，执行如下命令

$ uncompyler.py quick_sort.pyc

生成代码如下，基本完整保留了源代码的所有信息

# 2013.07.24 23:09:19 CST

def qsort1(list):
    """
    Quicksort using list comprehensions
    >>> qsort1<<docstring test numeric input>>
    <<docstring test numeric output>>
    >>> qsort1<<docstring test string input>>
    <<docstring test string output>>
    """
    if list == []:
        return []
    else:
        pivot = list[0]
        lesser = qsort1([ x for x in list[1:] if x < pivot ])
        greater = qsort1([ x for x in list[1:] if x >= pivot ])
        return lesser + [pivot] + greater


if __name__ == '__main__':
    import random
    a = [ random.randint(0, 100) for i in range(10) ]
    a = qsort1(a)
    print a

+++ okay decompyling quick_sort.pyc
# decompiled 1 files: 1 okay, 0 failed, 0 verify failed
# 2013.07.24 23:09:19 CST

REFs:

https://github.com/gstarnberger/uncompyle

http://stackoverflow.com/questions/8189352/decompile-python-2-7-pyc

http://en.literateprograms.org/Quicksort_(Python)