reconstructing source from objects

Question

I'd like to grab the code from actual python objects. This is the opposite idea of AST and parse, I have an object in memory and I want to recreate the source code. I don't want to get down to the byte code that's excessive, I just want a representation of the code that made the object:

In [24]: from django.apps import apps
In [25]: x= apps.get_app('accounts')

In [26]: x
Out[26]: <module 'mysite.accounts.models' from '/home/cchilders/work_projects/mysite/mysite/accounts/models.py'>

In [27]: x.
x.BusinessUnit                       x.models           

In [35]: bizunit = x.BusinessUnit

In [36]: type(bizunit)
Out[36]: django.db.models.base.ModelBase

import something

bizunit_code = something.something(bizunit)

I want the source of all models, but using ast seems too hairy especially since django provides the apps module to grab all models. Now I just need to untranslate it

Thank you

must it work for any object, or only a limited set? do you expect to have access to the sources? If you do have access, you can write a parser that looks for the string class <NAME> in the object's namespace. If the set is very limited and you want a quick test you can always override the __repr__ method of those objects with the string you want to become. Let me know if any of this would be OK to take a try — fr_andres
– fr_andres, Commented Mar 21, 2016 at 23:20
it has to work for all custom written models. I can grab all dirs under main project folder to check if the app I get is custom or 3rd party, but it's faster to use the apps and just check if the model is in our source — codyc4321
– codyc4321, Commented Mar 21, 2016 at 23:25

Simeon Visser · Accepted Answer · 2016-03-21 23:20:12Z

2

You may be able to obtain the source code using:

import inspect
print(inspect.getsource(biz unit))

This only works when the argument is a module, class, method, function, traceback, frame, or code object. If Python is unable to obtain the source code then this will raise a IOError.

answered Mar 21, 2016 at 23:20

Simeon Visser

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2 Comments

codyc4321 Over a year ago

yep that works perfectly. for some reason I thought expect was only doing bytecode. What is the module that lets you go step by step in the bytecode?

Simeon Visser Over a year ago

@codyc4321: that's import dis; dis.dis(obj)

Community · Accepted Answer · 2017-05-23 12:07:46Z

0

If you want to reconstruct source text from an AST, you can build a prettyprinter.

See my SO answer on how to do this: https://stackoverflow.com/a/5834775/120163

edited May 23, 2017 at 12:07

CommunityBot

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answered Mar 22, 2016 at 2:33

Ira Baxter

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