amplpy Changelog#

20250513#

0.16.1#

Fix get() function.

20251208#

0.16.0#

Add type hints to amplpy.
Add Python 3.14 and Python 3.14t support.

20250709#

0.15.2#

Fix Environment object issue when an ampl directory exists.
Fix AMPLException object issue when the exception is printed.

20250620#

0.15.1#

[Breaking] Support options times or gentimes.
Add option “_throw_on_warnings” to control whether warnings raise exceptions.

20250618#

0.15.0#

Migrated to Cython for generating extension modules, improving performance and maintainability.
Add str for AMPL objects.
Add ampls methods into AMPL object, i.e., AMPL.to_ampls() and AMPL.import_ampls_solution().
Add logging to exceptions thrown by ErrorHandler.
[Breaking] Update AMPL warnings to throw an exception.
[Breaking] Throw if options times or gentimes are set.
Allow setting options as dict in AMPL, e.g., AMPL.option = {“solver”: “gurobi”, “var_bounds”: 1, “gurobi_options”: {“outlev”: True, “timelim”: 1}}

20240521#

0.14.1#

Add flat argument to AMPL.get_iis.

20240521#

0.14.0#

Allow assigning values to indexed sets from a dictionary with the lists of members for every index.
Add AMPL.get_iis() to return dictionaries with variables and constraints in IIS.
Add AMPL.get_solution() to return a dictionary with the solution.

20240220#

0.13.3#

Fix issues with AMPL.solve(verbose=False) when the solver argument was not set.

20240105#

0.13.2#

OutputHandler: Flush standard output after every message.

20231229#

0.13.1#

Upgrade libampl to 2.3.7-20231229.
Upgrade ampltools to 0.7.3 adding amplpy.bundle command.
Fix issue with environment variables on Windows in a generic way.
Add return_output and solvername_options arguments to AMPL.solve
- You can now do ampl.solve(solver="gurobi", gurobi_options="outlev=1").

20231226#

0.13.0#

[Breaking] amplpy.modules now have priority in the PATH.
Fix ampl_libpath issue on Windows.

20231211#

0.12.2#

Upgrade libampl to 2.3.6-20231130.
Add solver argument to AMPL.solve.

20230921#

0.12.1#

Fix Parameter.set_values with np.ndarray objects.

20230829#

0.12.0#

Upgrade libampl to 2.2.0-20230825.
Use x-ampl by default if available.
Add properties AMPL.solve_result/AMPL.solve_result_num.
Add arguments to AMPL.solve to specify problem name and verbosity.
Allow passing pandas.Series to AMPL.set_data and Parameter.set_values.
Add AMPL.snapshot, and implement AMPL.export_model/AMPL.export_data using it.
[Breaking] Drop Python 3.5 compatibility.
[Breaking] Deprecate direct access methods to amplpy.DataFrame. Deprecated methods are still available with _ prefix.

20230711#

0.11.2#

[Breaking] Cast floats to integers whenever possible.

20230704#

0.11.1#

Add aliases Entity.get_values.to_pandas/to_list/to_dict.
Automatically stack 2D pandas.DataFrames.

20230621#

0.11.0#

Upgrade libampl to 2.1.2-20230618.
Add AMPL.write, PresolveException, and InfeasibilityException.
Improve handling of numpy types.
Allow assigning values to sets from iterables.
[Breaking] Drop async functionalities.
[Breaking] DataFrame.to_pandas: start using multi-index by default.
[Breaking] Drop Python 2.7 compatibility.
[Breaking] Iterating over non-indexed sets now iterates over set members.

20230522#

0.10.0#

Upgrade libampl to 2.1.0-20230522.
Breaking: Entity names do not contain spaces in the indices anymore.

20230421#

0.9.3#

Removed CamelCase from docstrings.

20230405#

0.9.2#

Add message to append to AMPLException messages.

20230322#

0.9.1#

Simplify ampl_notebook import: “from amplpy import ampl_notebook”.

20230314#

0.9.0#

Preload amplpy.modules if found (reduces need for modules.load()).
Vendor ampltools.

20230123#

0.8.6#

Add amplpy.modules.

20220823#

0.8.5#

Update libampl to 2.0.11-20220823.
Ensure times and gentimes default to disabled.

20220802#

0.8.4#

Update libampl to 2.0.10-20220627.
Disable options times and gentimes during internal operations.

20220623#

0.8.3#

Improved handling of numpy types.

20220527#

0.8.2#

[BREAKING] Raise RuntimeError in Entity.get_values if there are any issues with the data.
Update libampl to 2.0.9.20220527.
Fixed hanging when license check fails on Windows.
Allow ‘-’ in option names.
Drop 32-bit support.
Add ampltools as dependency.

20220121#

0.8.1#

[BREAKING] Raise KeyError exceptions instead of TypeError exceptions when accessing entities that do not exist.

20211224#

0.8.0#

Update libampl to 2.0.8-2.
Allow users to specify the name of the AMPL executable.
Allow users to choose between using camelCase and snake_case methods.
Drop AMPL.exportGurobi model. It is now part of amplpy_gurobi.

20211201#

0.7.2#

Improve performance of many operations by moving code to the C++ layer.

20210726#

0.7.1#

Update libampl to 2.0.6-0.
Add Entity.xref.
Include complete license error message in license error exceptions.

20210125#

0.7.0#

Fix bug when assigning sets with mixed types.
Add support for pathlib.Path paths.
Basic support for MSYS, CYGWIN, and MINGW.
Support for linux-ppc64le and linux-aarch64.
Update libampl to 2.0.4-0.

20200228#

0.6.11#

Add support for ppc64le.

20191116#

0.6.10#

Fix “ImportError: DLL load failed” not fixed in the previous version.

20191116#

0.6.9#

Fix “ImportError: No module named _amplpython” introduced in the previous version.

20191116#

0.6.8#

Add Python 3.8 support.

20190622#

0.6.7#

Add optional parameter index_names to DataFrame.fromPandas.
Add DataFrame.fromDict to load data from dictionaries.
Allow setting entity values directly from dictionaries.

20190511#

0.6.6#

Update internal library.
Add AMPL.exportModel.
AMPL.exportData now supports indexed sets.

20190414#

0.6.5#

Improve AMPL.exportGurobiModel and AMPL.importGurobiSolution.
Add verbose option to AMPL.exportGurobiModel.
Add register_magics to register %%ampl and %%ampl_eval.

20190213#

0.6.4#

Fix dll loading issue with python versions that come with conda.

20181204#

0.6.3#

Fix issue with indexed sets (by updating the internal library).

20181120#

0.6.2#

Add support for Pandas Series.
Add optional gurobiDriver parameter to AMPL.exportGurobiModel.

20181113#

0.6.1#

Improve robustness of AMPL.exportGurobiModel.
Improve error message when AMPL is not in the search path.

20181103#

0.6.0#

Upgrade internal API to v2.0.
Add experimental methods AMPL._startRecording and AMPL._stopRecording.
Add experimental method AMPL._loadSession.
Add method AMPL.getCurrentObjective.
Add support to Python 3.7.
Fix truncated values in sets (amplapi#337).
Add method AMPL.importGurobiSolution.
Add method AMPL.getOutput.

20180506#

0.5.0#

Breaking: AMPL errors raise exceptions by default.
Breaking: Drop support for Python 3.3 on Linux.
Add AMPL.exportData.
Add AMPL.exportGurobiModel.

20180412#

0.4.1#

Fix: compatibility issues with multiple python versions.

20180410#

0.4.0#

Improve interaction with Pandas and Numpy.
Add DataFrame.fromNumpy.
Entity.setValues now accepts Pandas DataFrames.
Parameter.setValues and Set.setValues now accept Numpy arrays and matrices.
Breaking: DataFrame.toList and DataFrame.doDict do not wrap scalar values into lists anymore.

20180224#

0.3.4#

Fix: error messages not being shown in Jupyter Notebooks.
Breaking: AMPL errors no longer raise exceptions by default.

20180109#

0.3.3#

Fix issues related to the passing of infinity to AMPL.

20171213#

0.3.2#

Fix issue with DataFrames created with pandas.read_table.

20171117#

0.3.1#

Fix precision issue in parameters.

20171013#

0.3.0#

Introduce alternative method to access entities.

20170805#

0.2.0#

Add DataFrame.fromPandas and DataFrame.toPandas.

20170804#

0.1.2#

Improve DataFrame initialization.
Fix issue with stdout in jupyter notebooks.

20170730#

0.1.1#

Fix issues with strings in Python 3.

20170722#

0.1.0#

Initial release.