read-structure-step

============================ SEAMM Read Structure Plug-in

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A SEAMM plug-in to read common formats in computational chemistry

The current version uses Open Babel as an engine to parse various formats such as PDB, Mol2 or XYZ and transform them into the SEAMM structure format for further use in SEAMM flowcharts.

• Free software: BSD license
• Documentation: https://molssi-seamm.github.io/read_structure_step/index.html
• Code: https://github.com/molssi-seamm/read_structure_step

Features

• Emphasis in ease-of-use and simplicity. The public interface consists of a single function.
• Automatic file type recognition.
• OpenBabel as an engine to parse formats, but other engines can be easily implemented.
• Easily extensible to new formats.
• Current support for PDB, Mol2 and XYZ files.

Example +++++++

.. code:: python

import read_structure_step seamm_structure = read_structure_step.read("spc.xyz")

Acknowledgements

This package was created with Cookiecutter_ and the molssi-seamm/cookiecutter-seamm-plugin_ project template.

.. _Cookiecutter: https://github.com/audreyr/cookiecutter .. _molssi-seamm/cookiecutter-seamm-plugin: https://github.com/molssi-seamm/cookiecutter-seamm-plugin

Developed by the Molecular Sciences Software Institute (MolSSI_), which receives funding from the National Science Foundation_ under award ACI-1547580

.. _MolSSI: https://www.molssi.org .. _National Science Foundation: https://www.nsf.gov

======= History

2024.11.13 -- Bugfix: Issues with the names of properties

• Fixed syntax of the properties pulled out from MOPAC encoded parameterization inputs.

2024.11.3 -- Bugfix: MOPAC files with references in comments

• Fixed a bug that caused a crash when reading MOPAC files with references in the comments.
• Updated the MOPAC reader to the new approach for running MOPAC in the cases that it is needed: Z-matrices and mixed inputs that OpenBabel can't handle.

2024.8.23 -- Enhancements to directory handling

• Changed the handling of paths to make them relative to the directory that the step is running in. In a loop, for instance, files are relative to the iteration directory.
• When reading files, allow the syntax 'job:///...' to read files from another job. If the job number is omitted, so the prefix is 'job:///...', the top directory of the current job is used.

2024.7.28 -- Added new names for systems and configurations

• Made the naming of systems and configurations consistent with the standard parameters for them in the GUI.
• Removed all "from file" options, replacing them with "title", which means the title from the file, if it exists, or the filename if it doesn't.

2023.11.16 -- Bugfix: titles in SDF files

• Crashed reading some SDF files write by SEAMM due to the system and configuration names encoded in the title having multiple slashes (/).

2023.11.5 -- Added writers for CIF and mmCIF.

2023.11.2 -- Initial changes to structure handling

• Moving towards the standard structure handling that has developed across SEAMM.

2023.8.30 -- Support for spacegroup symmetry

2023.7.28 -- Implemented ranges for reading XYZ and SDF files.

2023.7.27.1 -- Removed debug printing.

2023.7.27 -- Support for .gz and .bz2 files, and multi-structure .xyz files

• Handle .gz and .bz2 files for .sdf and .xyz extensions.
• Handle multi-structure XYZ files with a blank line between records.

2023.7.6 -- Bugfixes

• Fixed output of number of structures written to SDF files, which was off by 1.
• Cleaned up the output for the write-structure step

2023.1.30 -- Fixed issue#43, duplicate systems or configuration created

• Reading a single structure from e.g. a .sdf file created a second system or configuration, depending on the stucture control options.

2023.1.24 -- Added handler for XYZ files and added properties

• Added a custom handler for XYZ files to cope with some of the variant formats.

  • Supports files with no atom count on the first line

  • Supports the variant used in the Minnesota Solubility database, which has 3 header lines.

• Add capability to store properties into the database for formats such as MOPAC and SDF that can handle properties. Also can output the properties when writing the files.

• Fixed bugs if the system name or configuration name is not a string, but rather a number.

2022.10.28 -- Fixed bug reading cif and mmcif files

• There was a bug that caused a crash when reading cif and mmcif files, and potentially some other formats. It has been fixed throughout.

• The standard error for properties were missing a commma in the property name. The comma is standard elsewhere in SEAMM so add it here: ', stderr'

2022.10.26 -- Handling OpenBabel error messages for MOPAC .mop files Hiding messages about errors Kekulizing structures, which doesn't seem to be a serious issue, and printing any other messages as warnings.

2021.2.12 (12 February 2021)

• Updated the README file to give a better description.

• Updated the short description in setup.py to work with the new installer.

• Added keywords for better searchability.

2021.2.4 (4 February 2021) Updated for compatibility with the new system classes in MolSystem 2021.2.2 release.

2020.12.5 (5 December 2020) Internal: switching CI from TravisCI to GitHub Actions, and in the process moving documentation from ReadTheDocs to GitHub Pages where it is consolidated with the main SEAMM documentation.

2020.8.1 (1 August 2020) Removed leftover debug print statements.

0.9 (15 April 2020)

• General bug fixing and code cleanup.

• Part of release of all modules.

0.7.1 (23 November 2019) First release on PyPI.