unfold

Publicly share data packages that allow reproducing LCA databases based on licensed data.

If you use this software, please cite the following article:

Sacchi, R., (2023). unfold: removing the barriers to sharing and reproducing prospective life-cycle assessment databases. Journal of Open Source Software, 8(83), 5198, https://doi.org/10.21105/joss.05198

What does unfold do?

unfold is a Python package that allows "folding" and "unfolding" LCA databases derived from a source database (e.g., ecoinvent) without exposing the licensed data it builds from.

The purpose of this package is to allow users to publicly share LCA databases without sharing the source database, in the case where the latter is under restrictive license. Hence, unfold allows users to share instead data packages that allows other users to reproduce the LCA database (provided they have the source database).

It is based on the brightway2 framework.

unfold is initially conceived to share premise-generated databases (link), or any other databases that have been heavily modified and derived from a base which is under restrictive licensing (i.e., ecoinvent).

Limitations

• only works with brightway2 at the moment
• only tested wih ecoinvent 3.6, 3.7 and 3.8 (but should be working with any other source database in principle)

How to

Install

unfold is available on PyPI and can be installed with pip:

pip install unfold

Alternatively, you can clone the repository and install the library from the source code:

git clone https://github.com/polca/unfold.git
cd unfold
pip install -e .

It can also be installed from conda:

conda install -c romainsacchi unfold

Use

See also examples notebooks in the examples folder.

fold

unfold can "fold" several brightway2 databases into a single data package. The data package is a zip file containing the differences of the databases in relation to a source database (including extra inventories), as well as a metadata file that describes the databases and their content.

    from unfold import Fold
    import bw2data
    
    # name of the brightway project containing 
    # both the source database and the databases to fold
    bw2data.projects.set_current("some BW2 project")
    
    f = Fold()
    f.fold()

The resulting data package is saved in the current directory and can be shared with other users.

unfold

unfold can "unfold" a data package into one or several brightway2 databases.

    from unfold import Unfold
    import bw2data
    
    # name of the brightway project containing 
    # both the source database and the databases to unfold
    bw2data.projects.set_current("some BW2 project")
    
    u = Unfold("a package name.zip")
    u.unfold()

The file path given to the Unfold class can be either absolute or relative to the current directory, or even a URL.

unfold a superstructure database (to be used with Activity Browser)

unfold can "unfold" a data package into a superstructure database that can be used with the Activity Browser.

    from unfold import Unfold
    import bw2data
    
    # name of the brightway project containing 
    # both the source database and the databases to unfold
    bw2data.projects.set_current("some BW2 project")
    
    u = Unfold("a package name.zip")
    u.unfold(superstructure=True)

This outputs a superstructure database in your brightway2 project, as well as a scenario difference file (Excel) in the current working directory.

Contributing

Unfold is an open-source project, and contributions are welcome. To contribute to the project, please create a pull request on the project's GitHub page. Before submitting a pull request, please make sure that your changes are properly documented and that all tests pass.

Issues

If you encounter any problems, please open an issue on the project's GitHub page. Please include a minimal working example that reproduces the problem. If you are reporting a bug, please include the version of the package you are using.

Support

If you need help using Unfold, please contact the author (see below).

Author

Romain Sacchi, PSI

License

Unfold is released under the MIT License. See the License file for more information.