retrieve source code from code object as returned by compile()

[Justin Ezequiel]

Is there a way to get the original source?
I am trying to retrieve the main script from a py2exe'd old program.
The programmer neglected to commit to SVN before leaving.

Using "Easy Python Decompiler" I am able to get the source for the imported modules.
Using "Resources Viewer" from PlexData and some code I am able to retrieve the code object. I am however stumped as to how to retrieve the source from this code object.

PythonWin 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit (Intel)] on win32.
Portions Copyright 1994-2008 Mark Hammond - see 'Help/About PythonWin' for further copyright information..... if n.startswith('_'): continue
.... print n
.... a = getattr(c, n)
.... print type(a)
.... print `a`
.... print
....
co_argcount
<type 'int'>
0

co_cellvars
<type 'tuple'>
()

co_code
<type 'str'>
'd\x00\x00d\x01\x00k\x00\x00Z\x00\x00e\x00\x00i\x00\x00\x83\x00\x00GHd\x01\x00S'

co_consts
<type 'tuple'>
(-1, None)

co_filename
<type 'str'>
'foo.py'

co_firstlineno
<type 'int'>
1

co_flags
<type 'int'>
64

co_freevars
<type 'tuple'>
()

co_lnotab
<type 'str'>
'\x0c\x01'

co_name
<type 'str'>
'<module>'

co_names
<type 'tuple'>
('time',)

co_nlocals
<type 'int'>
0

co_stacksize
<type 'int'>
2

co_varnames

 

[Gregory Ewing]

Using "Easy Python Decompiler" I am able to get the source for the imported
modules. Using "Resources Viewer" from PlexData and some code I am able to
retrieve the code object. I am however stumped as to how to retrieve the
source from this code object.

Easy Python Decompiler should be able to do that, but you
may need to delve into its innards a bit to find an entry
point where you can feed in a code object.

Alternatively you could create a .pyc file out of the code
object and then use Easy Python Decompiler on that. The
following snippet of code should do that:

import marshal
import py_compile
import time

with open('output.pyc', 'wb') as fc:
fc.write('\0\0\0\0')
py_compile.wr_long(fc, long(time.time()))
marshal.dump(codeobject, fc)
fc.flush()
fc.seek(0, 0)
fc.write(py_compile.MAGIC)

(Taken from:
http://stackoverflow.com/questions/8627835/generate-pyc-from-python-ast)

 

[Justin Ezequiel]

Alternatively you could create a .pyc file out of the code
object and then use Easy Python Decompiler on that. The
following snippet of code should do that:

(Taken from:

http://stackoverflow.com/questions/8627835/generate-pyc-from-python-ast)

Woohoo! Success! Thank you Greg!

 

[Amirouche Boubekki]

in python3, I do inspect.getsource(object)
[doc<https://docs.python.org/3/library/inspect.html#inspect.getsource>],
I don't know the limitations.

On Python 2, there is meta <https://pypi.python.org/pypi/meta>.

My interest is different, I use to retrieve the definition of function to
submit it to a database, instead of stored procedures, but I have the
source of the code. It can also be used to retrieve the ast.

 

[Gregory Ewing]

in python3, I do inspect.getsource(object) [doc
<https://docs.python.org/3/library/inspect.html#inspect.getsource>], I
don't know the limitations.

The limitation relevant here is that it requires the
original source file to be present.