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OPY - Obfuscator for Python, string obfuscation added, keyword added

Project description

Image of Phaistos Disc

The famous Phaistos Disc from Crete, obfuscation unbroken after thousands of years.

Opy will obfuscate your extensive, real world, multi module Python source code for free! And YOU choose per project what to obfuscate and what not, by editing the config file:

  • You can recursively exclude all identifiers of certain modules from obfuscation.

  • You can exclude human readable configuration files containing Python code.

  • You can use getattr, setattr, exec and eval by excluding the identifiers they use.

  • You can even obfuscate module file names and string literals.

  • You can run your obfuscated code from any platform.

Bugs fixed:

  • pep8_comments config setting now defaults to True, making it possible for opy to obfuscate itself as a test

  • erroneous copying of directories above project root fixed

  • name of files now left unaltered by default

  • module directories renamed appropriately

  • .pyc files not copied to target directory tree anymore. N.B. Delete them from your existing target trees since they break obfuscation!

  • from __future__ import now handled correctly

Bug reports and feature requests are most welcome and will be taken under serious consideration on a non-committal basis

What’s new:

  • possibiliy to specify input dir, output dir and config file documented

  • skip_path_fragmens fixed

  • explanatory comments in config file made more clear

  • reasonable defaults provided for all configuration settings

  • -h an –help added in addition to ?

  • pep8_comments option added

  • support for obfuscation of names starting with __ added

  • license changed from QQuickLicense to Apache 2.0

  • empty lines are removed


  • Download and unzip Opy into an arbitrary directory of your computer.

  • You only need the files and py_config.txt. They are in the opy subdirectory of your unzipped Opy version.

  • Put or a script to launch it in the path of your OS, or simply copy to the topdirectory of your project.


  • For safety, backup your sourcecode and valuable data to an off-line medium.

  • Put a copy of opy_config.txt in the top directory of your project.

  • Adapt it to your needs according to the remarks in opy_config.txt.

  • This file only contains plain Python and is exec’ed, so you can do anything clever in it.

  • Open a command window, go to the top directory of your project and run from there.

  • If the topdirectory of your project is e.g. ../work/project1 then the obfuscation result wil be in ../work/project1_opy.

  • Further adapt opy_config.txt until you’re satisfied with the result.

  • Type ‘opy ?’ or ‘python ?’ (without the quotes) on the command line to display a help text and a reference to the licence.

Important remark:

  • Obfuscate your Python code only when stricktly needed. Freedom is one of the main benefits of the Python community. In line with this the source of Opy is not obfuscated.

Example of obfuscated code:

import Tkinter as l1111lll1
import tkFileDialog
import os

from util import *

from l1l111l import *
from l1llll1 import *

l1l1lll1l1l1 = 35
l1l11l1ll1 = 16

class l111l1l111l (l1111lll1.Frame, l1lll11ll1):
        def __init__ (self, parent):
                l1111lll1.Frame.__init__ (self, parent)
                l1lll11ll1.__init__ (self)

                self.l1l1ll11llll = []

                self.l1l1ll11llll.append (l1111lll1.Frame (self, width = l1l1llll1111, height = l1l11l111l))
                self.l1l1ll11llll [-1] .pack (side = l1llll (u'ࡶࡲࡴࠬ'))

                self.l1l1ll1ll11l = l1111lll1.LabelFrame (self, text = l1llll (u'ࡒࡦࡵࡤࡱࡵࡲࡩ࡯ࡩ࠸'), padx = 5)
                self.l1l1ll1ll11l.pack (side = l1llll (u'ࡺ࡯ࡱࠢ'), fill = l1llll (u'ࡦࡴࡺࡨࠧ'), expand = True)

Known limitations:

  • A comment after a string literal should be preceded by whitespace.

  • A ‘ or “ inside a string literal should be escaped with \ rather then doubled.

  • If the pep8_comments option is False (the default), a # in a string literal can only be used at the start, so use ‘p’’#’’r’ rather than ‘p#r’.

  • If the pep8_comments option is set to True, however, only a <blank><blank>#<blank> cannot be used in the middle or at the end of a string literal

  • Obfuscation of string literals is unsuitable for sensitive information since it can be trivially broken

  • No renaming backdoor support for methods starting with __ (non-overridable methods, also known as private methods)

That’s it, enjoy!

Jacques de Hooge

Other packages you might like:


Copyright 2014, 2015, 2016, 2017 Jacques de Hooge, GEATEC engineering,

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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