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# Release notes for cobrapy 0.19.0
We now have an official code of conduct and a committee of three people to handle
reports! You can contact them at [conduct@opencobra.org](mailto:conduct@opencobra.org).
You can also contact them individually at:
* [Maureen Carey](mailto:MAC9JC@virginia.edu)
* [Svetlana Kutuzova](mailto:svegal@biosustain.dtu.dk)
* [Greg Medlock](mailto:GLM5UH@virginia.edu)
Many thanks to them for taking on this responsibility.
## New features
- Deletion result DataFrames as returned by functions from `cobra.deletions`
now have a new `knockout` accessor. See the docs on usage examples.
- All summaries are now persistent objects. The same summary can be displayed in
multiple ways. The underlying data for the summary can also be accessed.
- The model summary now displays elementary (by default carbon) uptake and secretion.
- The JSON schema is now available as a stand-alone JSON file.
## Fixes
- Remove the frozenset indexing in deletion DataFrames that is now unsupported
in pandas.
- Summaries for models, metabolites, and reactions are now calculated instantaneously
and thus also work with model contexts.
- JSON models can now contain infinity and NaN values as bounds.
- The Matlab bridge for reading Matlab models should be restored. Any testing or
problem reports are greatly appreciated.
## Deprecated features
- We are progressively updating our codebase. That means that more and more parts will
require Python 3.6+.
## Backwards incompatible changes
- Deletion result DataFrames have no frozenset index anymore but now carry the
deleted elements in the `ids` column.
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