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PyQInt

status Version PyPI pkg PyPI License: GPL v3

Purpose

PyQInt is a Python-based, teaching-oriented implementation of the Hartree-Fock method, designed to make the inner workings of electronic structure theory accessible and transparent. It provides a clear, readable interface to fundamental components such as molecular integrals over Gaussian basis functions, SCF procedures (with DIIS acceleration), orbital localization, and geometry optimization.

What sets PyQInt apart is its educational design philosophy: all matrices, intermediate results, and algorithmic steps are exposed—allowing students, educators, and developers to inspect, understand, and experiment with every part of the computation. Whether you are learning how Hartree-Fock works, developing your own extensions, or teaching a course in computational chemistry, PyQInt offers a hands-on, exploratory platform.

For students interested in the theoretical foundations and algorithmic implementation of Hartree–Fock, we recommend the open-access textbook Elements of Electronic Structure Theory.

Documentation

PyQInt comes with detailed documentation and examples, which can be found at https://ifilot.github.io/pyqint/.

Features

The following molecular integrals are supported by PyQInt

  • Overlap integral
  • Kinetic integral
  • Dipole integral
  • Nuclear integral
  • Two-electron repulsion integral

as well as the following geometric derivatives

  • Overlap integral
  • Kinetic integral
  • Nuclear integral
  • Two-electron repulsion integral

PyQInt offers additional features such as

  • Performing restricted Hartree-Fock calculations using DIIS
  • Population and bonding analysis methods, including:
    • Mulliken and Löwdin atomic charge analysis
    • Molecular Orbital Hamilton Population (MOHP)
    • Molecular Orbital Overlap Population (MOOP)
    • Molecular Orbital Bond Index (MOBI)
  • Construction of localized orbitals using the Foster-Boys method
  • Geometry optimization using the Conjugate Gradient algorithm
  • Visualization of molecular orbitals

All routines are (automatically) tested and verified against several open-source as well as commercial programs that use cartesian Gaussian orbitals. Nevertheless, if you spot any mistake, please kindly open an issue in this Github repository.

In the image below, the (canonical) molecular orbitals as found using a restricted Hartree-Fock calculation for the CO molecule are shown.

Contour plots of CO Contour plots of the CO molecule

Isosurfaces of CO Isosurfaces of the canonical molecular orbitals of CO

Isosurfaces of CO Isosurfaces of the localized molecular orbitals of CO

Community guidelines

License

Unless otherwise stated, all code in this repository is provided under the GNU General Public License version 3.

Metadata

Release files for pyqint 1.4.3

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for pyqint 1.4.3
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pyqint-1.4.3.tar.gz 7.4 MB Details

Built distributions (wheels)

Table of built distributions (wheels) for pyqint 1.4.3
File
pyqint-1.4.3-cp314-cp314-win_amd64.whl CPython 3.14 CPython 3.14 Windows x86-64 Details
pyqint-1.4.3-cp314-cp314-musllinux_1_2_x86_64.whl CPython 3.14 CPython 3.14 Linux musl 1.2+ x86-64 Details
pyqint-1.4.3-cp314-cp314-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.14 CPython 3.14 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details
pyqint-1.4.3-cp314-cp314-macosx_11_0_arm64.whl CPython 3.14 CPython 3.14 macOS 11.0+ ARM64 Details
pyqint-1.4.3-cp314-cp314-macosx_10_15_x86_64.whl CPython 3.14 CPython 3.14 macOS 10.15+ x86-64 Details
pyqint-1.4.3-cp313-cp313-win_amd64.whl CPython 3.13 CPython 3.13 Windows x86-64 Details
pyqint-1.4.3-cp313-cp313-musllinux_1_2_x86_64.whl CPython 3.13 CPython 3.13 Linux musl 1.2+ x86-64 Details
pyqint-1.4.3-cp313-cp313-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.13 CPython 3.13 Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64 Details
pyqint-1.4.3-cp313-cp313-macosx_11_0_arm64.whl CPython 3.13 CPython 3.13 macOS 11.0+ ARM64 Details
pyqint-1.4.3-cp313-cp313-macosx_10_13_x86_64.whl CPython 3.13 CPython 3.13 macOS 10.13+ x86-64 Details
pyqint-1.4.3-cp312-cp312-win_amd64.whl CPython 3.12 CPython 3.12 Windows x86-64 Details
pyqint-1.4.3-cp312-cp312-musllinux_1_2_x86_64.whl CPython 3.12 CPython 3.12 Linux musl 1.2+ x86-64 Details
pyqint-1.4.3-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.12 CPython 3.12 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details
pyqint-1.4.3-cp312-cp312-macosx_11_0_arm64.whl CPython 3.12 CPython 3.12 macOS 11.0+ ARM64 Details
pyqint-1.4.3-cp312-cp312-macosx_10_13_x86_64.whl CPython 3.12 CPython 3.12 macOS 10.13+ x86-64 Details
pyqint-1.4.3-cp311-cp311-win_amd64.whl CPython 3.11 CPython 3.11 Windows x86-64 Details
pyqint-1.4.3-cp311-cp311-musllinux_1_2_x86_64.whl CPython 3.11 CPython 3.11 Linux musl 1.2+ x86-64 Details
pyqint-1.4.3-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.11 CPython 3.11 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details
pyqint-1.4.3-cp311-cp311-macosx_11_0_arm64.whl CPython 3.11 CPython 3.11 macOS 11.0+ ARM64 Details
pyqint-1.4.3-cp311-cp311-macosx_10_9_x86_64.whl CPython 3.11 CPython 3.11 macOS 10.9+ x86-64 Details
pyqint-1.4.3-cp310-cp310-win_amd64.whl CPython 3.10 CPython 3.10 Windows x86-64 Details
pyqint-1.4.3-cp310-cp310-musllinux_1_2_x86_64.whl CPython 3.10 CPython 3.10 Linux musl 1.2+ x86-64 Details
pyqint-1.4.3-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.10 CPython 3.10 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details
pyqint-1.4.3-cp310-cp310-macosx_11_0_arm64.whl CPython 3.10 CPython 3.10 macOS 11.0+ ARM64 Details
pyqint-1.4.3-cp310-cp310-macosx_10_9_x86_64.whl CPython 3.10 CPython 3.10 macOS 10.9+ x86-64 Details
pyqint-1.4.3-cp39-cp39-win_amd64.whl CPython 3.9 CPython 3.9 Windows x86-64 Details
pyqint-1.4.3-cp39-cp39-musllinux_1_2_x86_64.whl CPython 3.9 CPython 3.9 Linux musl 1.2+ x86-64 Details
pyqint-1.4.3-cp39-cp39-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.9 CPython 3.9 Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64 Details
pyqint-1.4.3-cp39-cp39-macosx_11_0_arm64.whl CPython 3.9 CPython 3.9 macOS 11.0+ ARM64 Details
pyqint-1.4.3-cp39-cp39-macosx_10_9_x86_64.whl CPython 3.9 CPython 3.9 macOS 10.9+ x86-64 Details

Total release size: 34.2 MB

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This release

1.4.3 This release

31 release files

1.3.0

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1.2.0

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1.1.1

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1.1.0

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0.17.4

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0.7.1

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0.7.0

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0.6.0

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0.5.0

5 release files

0.4.0

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