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Patch python built-in objects

Project description

[![Build Status](https://travis-ci.org/clarete/forbiddenfruit.png?branch=master)](https://travis-ci.org/clarete/forbiddenfruit)

# Forbidden Fruit

![Forbidden Fruit](logo.png)

This project aims to help you reach heaven while writing tests, but it may lead you to hell if used on production code.

It basically allows you to patch built-in objects, declared in C through python. Just like this:

`python >>> from forbiddenfruit import curse >>> def words_of_wisdom(self): ...     return self * "blah " >>> curse(int, "words_of_wisdom", words_of_wisdom) >>> assert (2).words_of_wisdom() == "blah blah " `

Boom! That’s it, your int class now has the words_of_wisdom method. Do you want to add a classmethod to a built-in class? No problem, just do this:

`python >>> from forbiddenfruit import curse >>> def hello(self): ...     return "blah" >>> curse(str, "hello", classmethod(hello)) >>> assert str.hello() == "blah" `

### Reversing a curse

If you want to free your object from a curse, you can use the reverse() function. Just like this:

`python >>> from forbiddenfruit import curse, reverse >>> curse(str, "test", "blah") >>> assert 'test' in dir(str) >>> # Time to reverse the curse >>> reverse(str, "test") >>> assert 'test' not in dir(str) `

## Compatibility

Forbidden Fruit runs on all cpython versions I tested so far, which includes the versions 2.5, 2.6, 2.7, 3.2 and 3.3. Since Forbidden Fruit is fundamentally dependent on the C API, this library won’t work on other python implementations, such as Jython, pypy, etc.

I might add support for pypy in the future, but It’s unlikely that I’ll do it for Jython. But I could happily accept patches for them.

## License

License (GPLv3)

Copyright (C) 2013 Lincoln Clarete <lincoln@comum.org>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.

### Logo by

Kimberly Chandler, from The Noun Project

[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/clarete/forbiddenfruit/trend.png)](https://bitdeli.com/free “Bitdeli Badge”)

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