Is there a library or application that can decompile Python 2.4+ bytecode to obtain the source code?
A search revealed:
I am incredibly surprised at the accuracy of depython.net
What I think they do is use the dis module and reconstruct your code with it. You'll have to find a way to do that or someone who has written the algorithm already.
I've used decompyle (the Ubuntu package, not the online service, I don't know if they're the same thing, though) in the past and was more than satisfied with the results. It saved me hours of work after a rm *.py instead of rm *.pyc.
Here is a little more info on decompyle: this is the same software that became the commercial decompyle service. It used to be open source and an old version of it is available/maintained as a debian package (including source code).
It will decompile Python up to version 2.3, but not 2.4+.
As others said, the free version of decompyle only works up to 2.3. But sometimes you can get it to work by converting your newer pyc to the old marshalling format.
The following script takes two arguments, the input and the output file, and converts it into something which decompyle will at least try its teeth on.
#!/usr/bin/python
import marshal
import sys
MAGIC23 = ';\xf2\r\n'
def load_pyc(filename):
f = open(filename, 'rb')
try:
magic = f.read(4)
timestamp = f.read(4)
codeobject = marshal.load(f)
finally:
f.close()
return magic, timestamp, codeobject
def dump_pyc_23(filename, timestamp, codeobject):
assert len(timestamp)==4
f = open(filename, 'wb')
try:
f.write(MAGIC23)
f.write(timestamp)
marshal.dump(codeobject, f, 0)
finally:
f.close()
magic, timestamp, codeobject = load_pyc(sys.argv[1])
dump_pyc_23(sys.argv[2], timestamp, codeobject)
Good Luck!
I have a good experience with UnPyc - it perfectly recovered my Django models.py.
You don't want an online service but depython.com is a good Python decompile service. Give it a try.