diff --git a/.github/ISSUE_TEMPLATE/release_checklist.md b/.github/ISSUE_TEMPLATE/release_checklist.md
index 6107962c..56c5fca3 100644
--- a/.github/ISSUE_TEMPLATE/release_checklist.md
+++ b/.github/ISSUE_TEMPLATE/release_checklist.md
@@ -11,12 +11,13 @@ assignees: ""
 - [ ] All PRs/issues attached to the release are merged.
 - [ ] All the badges on the README are passing.
 - [ ] License information is verified as correct. If you are unsure, please comment below.
-- [ ] Locally rendered documentation contains all appropriate pages, including API references (check no modules are
-      missing), tutorials, and other human-written text is up-to-date with any changes in the code.
+- [ ] Locally rendered documentation contains all appropriate pages, tutorials, and other human-written text is up-to-date with any changes in the code.
+- [ ] All API references are included. To check this, run `conda install scikit-package` and then `package build api-doc`. Review any edits made by rerendering the docs locally.
 - [ ] Installation instructions in the README, documentation, and the website are updated.
 - [ ] Successfully run any tutorial examples or do functional testing with the latest Python version.
 - [ ] Grammar and writing quality are checked (no typos).
 - [ ] Install `pip install build twine`, run `python -m build` and `twine check dist/*` to ensure that the package can be built and is correctly formatted for PyPI release.
+- [ ] Dispatch matrix testing to test the release on all Python versions and systems. If you do not have permission to run this workflow, tag the maintainer and say `@maintainer, please dispatch matrix testing workflow`.
 
 Please tag the maintainer (e.g., @username) in the comment here when you are ready for the PyPI/GitHub release. Include any additional comments necessary, such as version information and details about the pre-release here:
 
@@ -34,7 +35,7 @@ Please let the maintainer know that all checks are done and the package is ready
 <!-- After the maintainer releases the PyPI package, please check the following when creating a PR for conda-forge release.-->
 
 - [ ] Ensure that the full release has appeared on PyPI successfully.
-- [ ] New package dependencies listed in `conda.txt` and `test.txt` are added to `meta.yaml` in the feedstock.
+- [ ] New package dependencies listed in `conda.txt` and `tests.txt` are added to `meta.yaml` in the feedstock.
 - [ ] Close any open issues on the feedstock. Reach out to the maintainer if you have questions.
 - [ ] Tag the maintainer for conda-forge release.
 
diff --git a/.github/workflows/build-and-publish-docs-on-dispatch.yml b/.github/workflows/build-and-publish-docs-on-dispatch.yml
new file mode 100644
index 00000000..3d7394d0
--- /dev/null
+++ b/.github/workflows/build-and-publish-docs-on-dispatch.yml
@@ -0,0 +1,18 @@
+name: Build and Publish Docs on Dispatch
+
+on:
+  workflow_dispatch:
+
+jobs:
+  get-python-version:
+    uses: scikit-package/release-scripts/.github/workflows/_get-python-version-latest.yml@v0
+    with:
+      python_version: 0
+
+  docs:
+    uses: scikit-package/release-scripts/.github/workflows/_release-docs.yml@v0
+    with:
+      project: diffpy.srfit
+      c_extension: false
+      headless: false
+      python_version: ${{ fromJSON(needs.get-python-version.outputs.latest_python_version) }}
diff --git a/.github/workflows/build-wheel-release-upload.yml b/.github/workflows/build-wheel-release-upload.yml
index 4d66f1b5..c5e92258 100644
--- a/.github/workflows/build-wheel-release-upload.yml
+++ b/.github/workflows/build-wheel-release-upload.yml
@@ -1,4 +1,4 @@
-name: Release (GitHub/PyPI) and Deploy Docs
+name: Build Wheel, Release on GitHub/PyPI, and Deploy Docs
 
 on:
   workflow_dispatch:
@@ -7,12 +7,12 @@ on:
       - "*" # Trigger on all tags initially, but tag and release privilege are verified in _build-wheel-release-upload.yml
 
 jobs:
-  release:
+  build-release:
     uses: scikit-package/release-scripts/.github/workflows/_build-wheel-release-upload.yml@v0
     with:
       project: diffpy.srfit
       c_extension: false
-      maintainer_GITHUB_username: sbillinge
+      maintainer_GITHUB_username: cadenmyers13, sbillinge
     secrets:
       PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}
       PAT_TOKEN: ${{ secrets.PAT_TOKEN }}
diff --git a/.github/workflows/matrix-and-codecov-on-merge-to-main.yml b/.github/workflows/matrix-and-codecov.yml
similarity index 84%
rename from .github/workflows/matrix-and-codecov-on-merge-to-main.yml
rename to .github/workflows/matrix-and-codecov.yml
index 2bd09ede..b9a73c69 100644
--- a/.github/workflows/matrix-and-codecov-on-merge-to-main.yml
+++ b/.github/workflows/matrix-and-codecov.yml
@@ -1,6 +1,9 @@
-name: CI
+name: Matrix and Codecov
 
 on:
+  # push:
+  #   branches:
+  #     - main
   release:
     types:
       - prereleased
diff --git a/AUTHORS.rst b/AUTHORS.rst
index b2335043..68e2f2d8 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -1,7 +1,7 @@
 Authors
 =======
 
-Christopher Farrow, Pavol Juhas, Simon J. L. Billinge, and members of the Billinge Group
+Christopher Farrow, Pavol Juhas, Caden Myers, Simon J. L. Billinge, and members of the Billinge Group
 
 Contributors
 ------------
diff --git a/CODE-OF-CONDUCT.rst b/CODE-OF-CONDUCT.rst
index e8199ca5..9352c6ec 100644
--- a/CODE-OF-CONDUCT.rst
+++ b/CODE-OF-CONDUCT.rst
@@ -67,7 +67,7 @@ Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
 reported to the community leaders responsible for enforcement at
-sb2896@columbia.edu. All complaints will be reviewed and investigated promptly and fairly.
+cjm2304@columbia.edu and sbillinge@ucsb.edu. All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the
 reporter of any incident.
diff --git a/LICENSE.rst b/LICENSE.rst
index acbe6078..6d222385 100644
--- a/LICENSE.rst
+++ b/LICENSE.rst
@@ -9,7 +9,7 @@ OPEN SOURCE LICENSE AGREEMENT
 - Copyright (c) 2008-2012, The Trustees of Columbia University in the City of New York
 - Copyright (c) 2014-2019, Brookhaven Science Associates, Brookhaven National Laboratory
 - Copyright (c) 2020-2025, The Trustees of Columbia University in the City of New York
-
+- Copyright (c) 2026-present, The DiffPy Team.
 
 The "DiffPy-CMI" is distributed subject to the following license conditions:
 
diff --git a/MANIFEST.in b/MANIFEST.in
index b31fb162..c1ccccac 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -11,4 +11,3 @@ global-exclude __pycache__  # Exclude Python cache directories.
 global-exclude .git*  # Exclude git files and directories.
 global-exclude .idea  # Exclude PyCharm project settings.
 exclude .codecov.yml
-exclude .coveragerc
diff --git a/README.rst b/README.rst
index 2d4040ec..be8a91e4 100644
--- a/README.rst
+++ b/README.rst
@@ -25,6 +25,7 @@
         :target: https://anaconda.org/conda-forge/diffpy.srfit
 
 .. |PR| image:: https://img.shields.io/badge/PR-Welcome-29ab47ff
+        :target: https://github.com/diffpy/diffpy.srfit/pulls
 
 .. |PyPI| image:: https://img.shields.io/pypi/v/diffpy.srfit
         :target: https://pypi.org/project/diffpy.srfit/
@@ -38,7 +39,7 @@
 diffpy.srfit
 ============
 
-Configurable code for solving atomic structures.
+Generalized code base for modeling problems.
 
 The diffpy.srfit package provides the framework for building a global optimizer
 on the fly from components such as function calculators (that calculate
@@ -62,6 +63,23 @@ obtain the total cost function. Additionally, diffpy.srfit is designed to be
 extensible, allowing the user to integrate external calculators to perform
 co-refinements with other techniques.
 
+
+SrFit has tools for coherently combining known information about a
+material to derive other properties, in particular material structure.
+SrFit allows the customization and creation of structure
+representations, profile calculators, constraints, restraints and file
+input parsers. The customized pieces can be glued together within SrFit
+to optimize a structure, or other physically relevant information from
+one or more experimental profiles. Other known information about the
+system of interest can be included with arbitrarily complex constraints
+and restraints. In this way, the end user creates a customized fitting
+application that suits the problem to the available information.
+
+The subpackages herein define various pieces of the SrFit framework.
+Developers are encouraged to work through the examples described in the
+documentation to learn how to use and customize the various parts of
+SrFit.
+
 For more information about the diffpy.srfit library, please consult our `online documentation <https://diffpy.github.io/diffpy.srfit>`_.
 
 Citation
@@ -94,10 +112,6 @@ The following creates and activates a new environment named ``diffpy.srfit_env``
         conda create -n diffpy.srfit_env diffpy.srfit
         conda activate diffpy.srfit_env
 
-To confirm that the installation was successful, type ::
-
-        python -c "import diffpy.srfit; print(diffpy.srfit.__version__)"
-
 The output should print the latest version displayed on the badges above.
 
 This will install the minimal `diffpy.srfit` installation.  It will often be used
@@ -136,6 +150,19 @@ and run the following ::
 
         pip install .
 
+This package also provides command-line utilities. To check the software has been installed correctly, type ::
+
+        diffpy.srfit --version
+
+You can also type the following command to verify the installation. ::
+
+        python -c "import diffpy.srfit; print(diffpy.srfit.__version__)"
+
+
+To view the basic usage and available commands, type ::
+
+        diffpy.srfit -h
+
 Getting Started
 ---------------
 
@@ -167,12 +194,12 @@ trying to commit again.
 
 Improvements and fixes are always appreciated.
 
-Before contributing, please read our `Code of Conduct <https://github.com/diffpy/diffpy.srfit/blob/main/CODE_OF_CONDUCT.rst>`_.
+Before contributing, please read our `Code of Conduct <https://github.com/diffpy/diffpy.srfit/blob/main/CODE-OF-CONDUCT.rst>`_.
 
 Contact
 -------
 
-For more information on diffpy.srfit please visit the project `web-page <https://diffpy.github.io/>`_ or email Simon Billinge at sb2896@columbia.edu.
+For more information on diffpy.srfit please visit the project `web-page <https://diffpy.github.io/>`_ or email the maintainers ``Caden Myers (cjm2304@columbia.edu) and Simon J. L. Billinge (sbillinge@ucsb.edu)``.
 
 Acknowledgements
 ----------------
diff --git a/cookiecutter.json b/cookiecutter.json
new file mode 100644
index 00000000..46da0e2e
--- /dev/null
+++ b/cookiecutter.json
@@ -0,0 +1,20 @@
+{
+  "author_names": "Christopher Farrow, Pavol Juhas, Caden Myers, Simon J. L. Billinge",
+  "author_emails": "farrowch@gmail.com, pavol.juhas@gmail.com, cjm2304@columbia.edu, sbillinge@ucsb.edu",
+  "maintainer_names": "Caden Myers, Simon J. L. Billinge",
+  "maintainer_emails": "cjm2304@columbia.edu, sbillinge@ucsb.edu",
+  "maintainer_github_usernames": "cadenmyers13, sbillinge",
+  "contributors": "Christopher Farrow, Pavol Juhas, Caden Myers, Simon J. L. Billinge, and members of the DiffPy community.",
+  "license_holders": "The DiffPy Team",
+  "project_name": "diffpy.srfit",
+  "github_username_or_orgname": "diffpy",
+  "github_repo_name": "diffpy.srfit",
+  "conda_pypi_package_dist_name": "diffpy.srfit",
+  "package_dir_name": "diffpy.srfit",
+  "project_short_description": "Generalized code base for modeling problems.",
+  "project_keywords": "regression, modeling, fitting, diffraction, PDF",
+  "minimum_supported_python_version": "3.11",
+  "maximum_supported_python_version": "3.13",
+  "project_needs_c_code_compiled": "No",
+  "project_has_gui_tests": "No"
+}
diff --git a/docs/examples/debyemodel.py b/docs/examples/debyemodel.py
index 758c05ef..3ec7002d 100644
--- a/docs/examples/debyemodel.py
+++ b/docs/examples/debyemodel.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ########################################################################
-"""Example of fitting the Debye model to experimental Debye-Waller factors.
+"""Example of fitting the Debye model to experimental Debye-Waller
+factors.
 
 In this example, we build a fit recipe that uses an external function that can
 simulate a atomic displacement parameters using the Debye model. This serves as
@@ -207,7 +208,8 @@ def main():
 
 
 def debye(T, m, thetaD):
-    """A wrapped version of 'adps' that can handle an array of T-values."""
+    """A wrapped version of 'adps' that can handle an array of
+    T-values."""
     y = numpy.array([adps(m, thetaD, x) for x in T])
     return y
 
diff --git a/docs/examples/debyemodelII.py b/docs/examples/debyemodelII.py
index 2c5602f4..5e82aaee 100644
--- a/docs/examples/debyemodelII.py
+++ b/docs/examples/debyemodelII.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ########################################################################
-"""Example of fitting the Debye recipe to experimental Debye-Waller factors.
+"""Example of fitting the Debye recipe to experimental Debye-Waller
+factors.
 
 This is an extension of example in debyemodel.py. The recipe we create will
 simultaneously fit the low and high temperature parts of the experimental data
diff --git a/docs/examples/npintensityII.py b/docs/examples/npintensityII.py
index 44e88506..2791a1b3 100644
--- a/docs/examples/npintensityII.py
+++ b/docs/examples/npintensityII.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ########################################################################
-"""Example of extracting information from multiple data sets simultaneously.
+"""Example of extracting information from multiple data sets
+simultaneously.
 
 This example builds on npintensitygenerator.py, and uses IntensityGenerator
 from that example to build a recipe that simultaneously refines two data sets
diff --git a/docs/examples/nppdfsas.py b/docs/examples/nppdfsas.py
index 0679e771..6626c603 100644
--- a/docs/examples/nppdfsas.py
+++ b/docs/examples/nppdfsas.py
@@ -38,7 +38,8 @@
 
 
 def makeRecipe(ciffile, grdata, iqdata):
-    """Make complex-modeling recipe where I(q) and G(r) are fit simultaneously.
+    """Make complex-modeling recipe where I(q) and G(r) are fit
+    simultaneously.
 
     The fit I(q) is fed into the calculation of G(r), which provides
     feedback for the fit parameters of both.
diff --git a/docs/examples/threedoublepeaks.py b/docs/examples/threedoublepeaks.py
index 6a5b7a42..d6c70202 100644
--- a/docs/examples/threedoublepeaks.py
+++ b/docs/examples/threedoublepeaks.py
@@ -30,7 +30,8 @@
 
 
 def makeRecipe():
-    """Make a FitRecipe for fitting three double-gaussian curves to data.
+    """Make a FitRecipe for fitting three double-gaussian curves to
+    data.
 
     The separation and amplitude ratio of the double peaks follows a
     specific relationship.  The peaks are broadend according to their
diff --git a/docs/source/api/diffpy.srfit.rst b/docs/source/api/diffpy.srfit.rst
index 8f840d0c..1e2925bf 100644
--- a/docs/source/api/diffpy.srfit.rst
+++ b/docs/source/api/diffpy.srfit.rst
@@ -1,7 +1,9 @@
 :tocdepth: -1
 
-diffpy.srfit package
-====================
+|title|
+=======
+
+.. |title| replace:: diffpy.srfit package
 
 .. automodule:: diffpy.srfit
     :members:
@@ -25,8 +27,10 @@ Subpackages
 Submodules
 ----------
 
-diffpy.srfit.exceptions module
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+|module|
+--------
+
+.. |module| replace:: diffpy.srfit.exceptions module
 
 .. automodule:: diffpy.srfit.exceptions
     :members:
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 6f33a1b7..99dc93f6 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -32,9 +32,7 @@
 sys.path.insert(0, str(Path("../../src").resolve()))
 
 # abbreviations
-ab_authors = (
-    "Christopher Farrow, Pavol Juhas, and members of the Billinge Group"
-)
+ab_authors = "Christopher Farrow, Pavol Juhas, Caden Myers, Simon J. L. Billinge, and members of the Billinge Group."
 
 # -- General configuration ------------------------------------------------
 
@@ -86,7 +84,7 @@
 
 # General information about the project.
 project = "diffpy.srfit"
-copyright = "%Y, The Trustees of Columbia University in the City of New York"
+copyright = "%Y, The DiffPy Team"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -317,7 +315,7 @@
         "diffpy.srfit Documentation",
         ab_authors,
         "diffpy.srfit",
-        "Configurable code for solving atomic structures.",
+        "Generalized code base for modeling problems.",
         "Miscellaneous",
     ),
 ]
diff --git a/docs/source/index.rst b/docs/source/index.rst
index ea21479d..b40360f6 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -1,14 +1,20 @@
-.. _developers-guide-index:
+#######
+|title|
+#######
 
-####################################################
-diffpy.srfit documentation
-####################################################
+.. |title| replace:: diffpy.srfit documentation
 
-diffpy.srfit - configurable code for solving atomic structures.
+``diffpy.srfit`` - Generalized code base for modeling problems.
 
-| Software version |release|.
+| Software version |release|
 | Last updated |today|.
 
+===============
+Getting started
+===============
+
+Welcome to the ``diffpy.srfit`` documentation!
+
 The diffpy.srfit package provides the framework for building a global optimizer
 on the fly from components such as function calculators (that calculate
 different data spectra), regression algorithms and structure models.  The
@@ -31,9 +37,9 @@ obtain the total cost function. Additionally, diffpy.srfit is designed to be
 extensible, allowing the user to integrate external calculators to perform
 co-refinements with other techniques.
 
-========================================
+=======
 Authors
-========================================
+=======
 
 diffpy.srfit is developed by members of the Billinge Group at
 Columbia University and at Brookhaven National Laboratory including
@@ -41,17 +47,23 @@ Christopher L. Farrow, Pavol Juhás, Simon J.L. Billinge.
 
 The source code in *observable.py* was derived from the 1.0 version
 of the Caltech "Pyre" project.
-
-For a detailed list of contributors see
+``diffpy.srfit`` is developed by Christopher Farrow, Pavol Juhas, Caden Myers, Simon J. L. Billinge, and members of the DiffPy community.
+This project is maintained by Caden Myers and Simon J. L. Billinge. For a detailed list of contributors see
 https://github.com/diffpy/diffpy.srfit/graphs/contributors.
 
-======================================
+============
 Installation
-======================================
+============
 
-See the `README <https://github.com/diffpy/diffpy.srfit#requirements>`_
+See the `README <https://github.com/diffpy/diffpy.srfit#installation>`_
 file included with the distribution.
 
+================
+Acknowledgements
+================
+
+``diffpy.srfit`` is built and maintained with `scikit-package <https://scikit-package.github.io/scikit-package/>`_.
+
 ======================================
 Where next?
 ======================================
@@ -62,10 +74,9 @@ Where next?
    examples.rst
    extending.rst
 
-======================================
+=================
 Table of contents
-======================================
-
+=================
 .. toctree::
    :titlesonly:
 
@@ -75,9 +86,9 @@ Table of contents
 
 .. faq.rst
 
-======================================
+=======
 Indices
-======================================
+=======
 
 * :ref:`genindex`
 * :ref:`modindex`
diff --git a/docs/source/license.rst b/docs/source/license.rst
index 7d78e94f..748b63bf 100644
--- a/docs/source/license.rst
+++ b/docs/source/license.rst
@@ -1,3 +1,5 @@
+:tocdepth: -1
+
 .. index:: license
 
 License
@@ -12,10 +14,11 @@ OPEN SOURCE LICENSE AGREEMENT
   Lawrence Berkeley National Laboratory
 | Copyright (c) 2014, Australian Synchrotron Research Program Inc., ("ASRP")
 | Copyright (c) 2006-2007, Board of Trustees of Michigan State University
-| Copyright (c) 2008-2012, The Trustees of Columbia University in
-  the City of New York
 | Copyright (c) 2014-2019, Brookhaven Science Associates,
   Brookhaven National Laboratory
+| Copyright (c) 2008-2025, The Trustees of Columbia University in
+  the City of New York
+| Copyright (c) 2026-present, The DiffPy Team.
 
 
 The "DiffPy-CMI" is distributed subject to the following license conditions:
diff --git a/news/update030.rst b/news/update030.rst
new file mode 100644
index 00000000..3ce80500
--- /dev/null
+++ b/news/update030.rst
@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Update codebase to scikit-package 0.3.0 standards.
+
+**Security:**
+
+* <news item>
diff --git a/pyproject.toml b/pyproject.toml
index fbbe0c3e..677cc175 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,13 +6,17 @@ build-backend = "setuptools.build_meta"
 name = "diffpy.srfit"
 dynamic=['version', 'dependencies']
 authors = [
-  { name="Simon Billinge", email="sb2896@columbia.edu" },
+  {name='Christopher Farrow', email='farrowch@gmail.com'},
+  {name='Pavol Juhas', email='pavol.juhas@gmail.com'},
+  {name='Caden Myers', email='cjm2304@columbia.edu'},
+  {name='Simon J. L. Billinge', email='sbillinge@ucsb.edu'},
 ]
 maintainers = [
-  { name="Simon Billinge", email="sb2896@columbia.edu" },
+  {name='Caden Myers', email='cjm2304@columbia.edu'},
+  {name='Simon J. L. Billinge', email='sbillinge@ucsb.edu'},
 ]
-description = "Configurable code for solving atomic structures."
-keywords = ['regression', 'modelling', 'fitting', 'diffraction', 'PDF']
+description = "Generalized code base for modeling problems."
+keywords = ['regression', 'modeling', 'fitting', 'diffraction', 'PDF']
 readme = "README.rst"
 requires-python = ">=3.11, <3.14"
 classifiers = [
@@ -48,6 +52,9 @@ include = ["*"]  # package names should match these glob patterns (["*"] by defa
 exclude = []  # exclude packages matching these glob patterns (empty by default)
 namespaces = false  # to disable scanning PEP 420 namespaces (true by default)
 
+[project.scripts]
+diffpy-srfit = "diffpy.srfit.app:main"
+
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements/pip.txt"]}
 
@@ -56,6 +63,11 @@ exclude-file = ".codespell/ignore_lines.txt"
 ignore-words = ".codespell/ignore_words.txt"
 skip = "*.cif,*.dat"
 
+[tool.docformatter]
+recursive = true
+wrap-summaries = 72
+wrap-descriptions = 72
+
 [tool.black]
 line-length = 79
 include = '\.pyi?$'
diff --git a/src/diffpy/__init__.py b/src/diffpy/__init__.py
index 3254c0a6..22cbdcc6 100644
--- a/src/diffpy/__init__.py
+++ b/src/diffpy/__init__.py
@@ -4,8 +4,10 @@
 # (c) 2008-2025 The Trustees of Columbia University in the City of New York.
 # All rights reserved.
 #
-# File coded by: Chris Farrow and Billinge Group members and community
-# contributors.
+# (c) 2025-present The DiffPy Team.
+#
+# File coded by: Christopher Farrow, Pavol Juhas, Caden Myers,
+# Simon J. L. Billinge, and members of the DiffPy community.
 #
 # See GitHub contributions for a more detailed list of contributors.
 # https://github.com/diffpy/diffpy.srfit/graphs/contributors
diff --git a/src/diffpy/srfit/__init__.py b/src/diffpy/srfit/__init__.py
index 0374fdcf..d8b19522 100644
--- a/src/diffpy/srfit/__init__.py
+++ b/src/diffpy/srfit/__init__.py
@@ -3,9 +3,10 @@
 #
 # (c) 2008-2025 The Trustees of Columbia University in the City of New York.
 # All rights reserved.
+# (c) 2026-present The DiffPy Team. All rights reserved.
 #
-# File coded by: Christopher Farrow, Pavol Juhas, and members of the
-# Billinge Group.
+# File coded by: Christopher Farrow, Pavol Juhas, Caden Myers,
+# Simon J. L. Billinge, and members of the DiffPy community.
 #
 # See GitHub contributions for a more detailed list of contributors.
 # https://github.com/diffpy/diffpy.srfit/graphs/contributors
@@ -13,27 +14,10 @@
 # See LICENSE.rst for license information.
 #
 ##############################################################################
-"""Complex modeling framework for structure refinement and solution.
-
-SrFit is a tool for coherently combining known information about a
-material to derive other properties, in particular material structure.
-SrFit allows the customization and creation of structure
-representations, profile calculators, constraints, restraints and file
-input parsers. The customized pieces can be glued together within SrFit
-to optimize a structure, or other physically relevant information from
-one or more experimental profiles. Other known information about the
-system of interest can be included with arbitrarily complex constraints
-and restraints. In this way, the end user creates a customized fitting
-application that suits the problem to the available information.
-
-The subpackages herein define various pieces of the SrFit framework.
-Developers are encouraged to work through the examples described in the
-documentation to learn how to use and customize the various parts of
-SrFit.
-"""
+"""Generalized code base for modeling problems."""
 
 # package version
-from diffpy.srfit.version import __version__
+from diffpy.srfit.version import __version__  # noqa
 
 # silence the pyflakes syntax checker
 assert __version__ or True
diff --git a/src/diffpy/srfit/equation/builder.py b/src/diffpy/srfit/equation/builder.py
index c33e0ff6..87a56b63 100644
--- a/src/diffpy/srfit/equation/builder.py
+++ b/src/diffpy/srfit/equation/builder.py
@@ -238,7 +238,8 @@ def registerFunction(self, name, func, argnames):
         return self.registerBuilder(name, opbuilder)
 
     def registerBuilder(self, name, builder):
-        """Register builder in this module so it can be used in makeEquation.
+        """Register builder in this module so it can be used in
+        makeEquation.
 
         If an extant builder with the given name is already registered,
         this will replace all instances of the old builder's literal in
@@ -282,7 +283,8 @@ def deRegisterBuilder(self, name):
         return
 
     def wipeout(self, eq):
-        """Invalidate the specified equation and remove it from the factory.
+        """Invalidate the specified equation and remove it from the
+        factory.
 
         This will remove the equation from the purview of the factory
         and also change its formula to return NaN.  This ensures that eq
@@ -576,7 +578,8 @@ class ArgumentBuilder(BaseBuilder):
     """
 
     def __init__(self, value=None, name=None, const=False, arg=None):
-        """Create an ArgumentBuilder instance, containing a new Argument.
+        """Create an ArgumentBuilder instance, containing a new
+        Argument.
 
         Parameters
         ----------
@@ -732,8 +735,8 @@ def getBuilder(name):
 
 
 def __wrap_numpy_operators():
-    """Export all numpy operators as OperatorBuilder instances in the module
-    namespace."""
+    """Export all numpy operators as OperatorBuilder instances in the
+    module namespace."""
     for name in dir(numpy):
         op = getattr(numpy, name)
         if isinstance(op, numpy.ufunc):
diff --git a/src/diffpy/srfit/equation/literals/literal.py b/src/diffpy/srfit/equation/literals/literal.py
index ebdc17a9..48c48eaa 100644
--- a/src/diffpy/srfit/equation/literals/literal.py
+++ b/src/diffpy/srfit/equation/literals/literal.py
@@ -26,7 +26,8 @@
 
 
 class Literal(Observable, LiteralABC):
-    """Abstract class for equation pieces, such as operators and arguments.
+    """Abstract class for equation pieces, such as operators and
+    arguments.
 
     Literal derives from Observable. See diffpy.srfit.util.observable.
 
diff --git a/src/diffpy/srfit/equation/literals/operators.py b/src/diffpy/srfit/equation/literals/operators.py
index a7863808..9b78b77c 100644
--- a/src/diffpy/srfit/equation/literals/operators.py
+++ b/src/diffpy/srfit/equation/literals/operators.py
@@ -141,7 +141,8 @@ def _loop_check(self, literal):
 
 
 class UnaryOperator(Operator):
-    """Abstract class for an unary operator with one input and one result.
+    """Abstract class for an unary operator with one input and one
+    result.
 
     This base class defines the `nin` and `nout` attributes.  The derived
     concrete operator must provide the remaining abstract attributes
@@ -154,7 +155,8 @@ class UnaryOperator(Operator):
 
 
 class BinaryOperator(Operator):
-    """Abstract class for a binary operator with two inputs and one result.
+    """Abstract class for a binary operator with two inputs and one
+    result.
 
     This base class defines the `nin` and `nout` attributes.  The derived
     concrete operator must define the remaining abstract attributes
@@ -359,7 +361,8 @@ def __init__(self, op):
 
 
 class ArrayOperator(Operator):
-    """Operator that will take parameters and turn them into an array."""
+    """Operator that will take parameters and turn them into an
+    array."""
 
     name = "array"
     symbol = "array"
diff --git a/src/diffpy/srfit/equation/visitors/printer.py b/src/diffpy/srfit/equation/visitors/printer.py
index 98cfab6a..d3aa5ee7 100644
--- a/src/diffpy/srfit/equation/visitors/printer.py
+++ b/src/diffpy/srfit/equation/visitors/printer.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""Printer visitor for printing the equation represented by a Literal tree.
+"""Printer visitor for printing the equation represented by a Literal
+tree.
 
 The Printer visitor creates a one-line representation of the Literal
 tree, which is valid as a string equivalent of the equation.
diff --git a/src/diffpy/srfit/equation/visitors/swapper.py b/src/diffpy/srfit/equation/visitors/swapper.py
index a6135750..c27cf85e 100644
--- a/src/diffpy/srfit/equation/visitors/swapper.py
+++ b/src/diffpy/srfit/equation/visitors/swapper.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""Swapper for replacing a Literal in an equation with another Literals."""
+"""Swapper for replacing a Literal in an equation with another
+Literals."""
 
 __all__ = ["Swapper"]
 
@@ -20,7 +21,8 @@
 
 
 class Swapper(Visitor):
-    """Swapper for swapping out one literal for another in a literal tree.
+    """Swapper for swapping out one literal for another in a literal
+    tree.
 
     Note that this cannot swap out a root node of a literal tree. This case
     must be tested for explicitly.
diff --git a/src/diffpy/srfit/fitbase/fitcontribution.py b/src/diffpy/srfit/fitbase/fitcontribution.py
index d6ff6ed0..21a7aed9 100644
--- a/src/diffpy/srfit/fitbase/fitcontribution.py
+++ b/src/diffpy/srfit/fitbase/fitcontribution.py
@@ -450,7 +450,8 @@ def residual(self):
         return self._reseq()
 
     def evaluate(self):
-        """Evaluate the contribution equation and update profile.ycalc."""
+        """Evaluate the contribution equation and update
+        profile.ycalc."""
         yc = self._eq()
         if self.profile is not None:
             self.profile.ycalc = yc
diff --git a/src/diffpy/srfit/fitbase/fithook.py b/src/diffpy/srfit/fitbase/fithook.py
index b5b284c5..3afa90d9 100644
--- a/src/diffpy/srfit/fitbase/fithook.py
+++ b/src/diffpy/srfit/fitbase/fithook.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""The FitHook class for inspecting the progress of a FitRecipe refinement.
+"""The FitHook class for inspecting the progress of a FitRecipe
+refinement.
 
 FitHooks are called by a FitRecipe during various times of the residual
 is evaluation. The default FitHook simply counts the number of times the
@@ -54,7 +55,8 @@ def reset(self, recipe):
         return
 
     def precall(self, recipe):
-        """This is called within FitRecipe.residual, before the calculation.
+        """This is called within FitRecipe.residual, before the
+        calculation.
 
         Attributes
         ----------
@@ -64,7 +66,8 @@ def precall(self, recipe):
         return
 
     def postcall(self, recipe, chiv):
-        """This is called within FitRecipe.residual, after the calculation.
+        """This is called within FitRecipe.residual, after the
+        calculation.
 
         Attributes
         ----------
@@ -121,7 +124,8 @@ def reset(self, recipe):
         return
 
     def precall(self, recipe):
-        """This is called within FitRecipe.residual, before the calculation.
+        """This is called within FitRecipe.residual, before the
+        calculation.
 
         Attributes
         ----------
@@ -134,7 +138,8 @@ def precall(self, recipe):
         return
 
     def postcall(self, recipe, chiv):
-        """This is called within FitRecipe.residual, after the calculation.
+        """This is called within FitRecipe.residual, after the
+        calculation.
 
         Attributes
         ----------
@@ -227,7 +232,8 @@ def reset(self, recipe):
         return
 
     def postcall(self, recipe, chiv):
-        """This is called within FitRecipe.residual, after the calculation.
+        """This is called within FitRecipe.residual, after the
+        calculation.
 
         Find data and plot it.
 
diff --git a/src/diffpy/srfit/fitbase/fitrecipe.py b/src/diffpy/srfit/fitbase/fitrecipe.py
index 72946e40..c44eb6d9 100644
--- a/src/diffpy/srfit/fitbase/fitrecipe.py
+++ b/src/diffpy/srfit/fitbase/fitrecipe.py
@@ -1278,8 +1278,8 @@ def set_plot_defaults(self, **kwargs):
         self.plot_options.update(kwargs)
 
     def _set_axes_labels_from_metadata(self, meta, plot_params):
-        """Set axes labels based on filename suffix in profile metadata if not
-        already set."""
+        """Set axes labels based on filename suffix in profile metadata
+        if not already set."""
         if isinstance(meta, dict):
             filename = meta.get("filename")
             if filename:
@@ -1292,8 +1292,8 @@ def _set_axes_labels_from_metadata(self, meta, plot_params):
         return
 
     def plot_recipe(self, ax=None, return_fig=False, **kwargs):
-        """Plot the observed, fit, and difference curves for each contribution
-        of the fit recipe.
+        """Plot the observed, fit, and difference curves for each
+        contribution of the fit recipe.
 
         If the recipe has multiple contributions, a separate
         plot is created for each contribution.
@@ -1516,7 +1516,8 @@ def _apply_values(self, p):
         return
 
     def _update_configuration(self):
-        """Notify RecipeContainers in hierarchy of configuration change."""
+        """Notify RecipeContainers in hierarchy of configuration
+        change."""
         self._ready = False
         return
 
diff --git a/src/diffpy/srfit/fitbase/fitresults.py b/src/diffpy/srfit/fitbase/fitresults.py
index d1627fa3..c154d018 100644
--- a/src/diffpy/srfit/fitbase/fitresults.py
+++ b/src/diffpy/srfit/fitbase/fitresults.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""The FitResults and ContributionResults classes for storing results of a fit.
+"""The FitResults and ContributionResults classes for storing results of
+a fit.
 
 The FitResults class is used to display the current state of a
 FitRecipe. It stores the state, and uses it to calculate useful
@@ -172,7 +173,8 @@ def __init__(self, recipe, update=True, showfixed=True, showcon=False):
         return
 
     def update(self):
-        """Update the results according to the current state of the recipe."""
+        """Update the results according to the current state of the
+        recipe."""
         # Note that the order of these operations are chosen to reduce
         # computation time.
 
@@ -310,7 +312,8 @@ def _calculate_jacobian(self):
         return jac
 
     def _calculate_metrics(self):
-        """Calculate chi2, cumchi2, rchi2, rw and cumrw for the recipe."""
+        """Calculate chi2, cumchi2, rchi2, rw and cumrw for the
+        recipe."""
         cumchi2 = numpy.array([], dtype=float)
         # total weighed denominator for the ratio in the Rw formula
         yw2tot = 0.0
@@ -628,8 +631,8 @@ def saveResults(self, filename, header="", footer="", update=False):
         return
 
     def get_results_dictionary(self):
-        """Get a dictionary of results, with variable names and values, and
-        overall metrics.
+        """Get a dictionary of results, with variable names and values,
+        and overall metrics.
 
         Returns
         -------
diff --git a/src/diffpy/srfit/fitbase/profileparser.py b/src/diffpy/srfit/fitbase/profileparser.py
index 32cb9669..b152164b 100644
--- a/src/diffpy/srfit/fitbase/profileparser.py
+++ b/src/diffpy/srfit/fitbase/profileparser.py
@@ -93,7 +93,8 @@ def getFormat(self):
         return self._format
 
     def parseString(self, patstring):
-        """Parse a string and set the _x, _y, _dx, _dy and _meta variables.
+        """Parse a string and set the _x, _y, _dx, _dy and _meta
+        variables.
 
         When _dx or _dy cannot be obtained in the data format it is set to
         None.
@@ -110,7 +111,8 @@ def parseString(self, patstring):
         raise NotImplementedError()
 
     def parseFile(self, filename):
-        """Parse a file and set the _x, _y, _dx, _dy and _meta variables.
+        """Parse a file and set the _x, _y, _dx, _dy and _meta
+        variables.
 
         This wipes out the currently loaded data and selected bank number.
 
diff --git a/src/diffpy/srfit/fitbase/recipeorganizer.py b/src/diffpy/srfit/fitbase/recipeorganizer.py
index ca7b273b..3daf5674 100644
--- a/src/diffpy/srfit/fitbase/recipeorganizer.py
+++ b/src/diffpy/srfit/fitbase/recipeorganizer.py
@@ -514,7 +514,8 @@ def _remove_parameter(self, par):
         return
 
     def registerCalculator(self, f, argnames=None):
-        """Register a Calculator so it can be used within equation strings.
+        """Register a Calculator so it can be used within equation
+        strings.
 
         A Calculator is an elaborate function that can organize Parameters.
         This creates a function with this class that can be used within string
@@ -551,7 +552,8 @@ def registerCalculator(self, f, argnames=None):
         return eq
 
     def registerFunction(self, f, name=None, argnames=None):
-        """Register a function so it can be used within equation strings.
+        """Register a function so it can be used within equation
+        strings.
 
         This creates a function with this class that can be used within string
         equations.  The resulting equation does not require the arguments to be
@@ -962,7 +964,8 @@ def clearRestraints(self, recurse=False):
         return
 
     def _get_constraints(self, recurse=True):
-        """Get the constrained Parameters for this and managed sub-objects."""
+        """Get the constrained Parameters for this and managed sub-
+        objects."""
         constraints = {}
         if recurse:
             for m in filter(_has_get_constraints, self._iter_managed()):
diff --git a/src/diffpy/srfit/fitbase/simplerecipe.py b/src/diffpy/srfit/fitbase/simplerecipe.py
index f3789a3a..e9da1f2c 100644
--- a/src/diffpy/srfit/fitbase/simplerecipe.py
+++ b/src/diffpy/srfit/fitbase/simplerecipe.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""Simple FitRecipe class that includes a FitContribution and Profile."""
+"""Simple FitRecipe class that includes a FitContribution and
+Profile."""
 
 from diffpy.srfit.fitbase.fitcontribution import FitContribution
 from diffpy.srfit.fitbase.fitrecipe import FitRecipe
diff --git a/src/diffpy/srfit/pdf/characteristicfunctions.py b/src/diffpy/srfit/pdf/characteristicfunctions.py
index 5d2bf15e..9846e131 100644
--- a/src/diffpy/srfit/pdf/characteristicfunctions.py
+++ b/src/diffpy/srfit/pdf/characteristicfunctions.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""Form factors (characteristic functions) used in PDF nanoshape fitting.
+"""Form factors (characteristic functions) used in PDF nanoshape
+fitting.
 
 These are used to calculate the attenuation of the PDF due to a finite
 size. For a crystal-like nanoparticle, one can calculate the PDF via
@@ -202,8 +203,8 @@ def spheroidalCF2(r, psize, axrat):
 
 
 def lognormalSphericalCF(r, psize, psig):
-    """Spherical nanoparticle characteristic function with lognormal size
-    distribution.
+    """Spherical nanoparticle characteristic function with lognormal
+    size distribution.
 
     Attributes
     ----------
@@ -405,8 +406,8 @@ def __init__(self, name, model):
         return
 
     def __call__(self, r):
-        """Calculate the characteristic function from the transform of the
-        BaseModel."""
+        """Calculate the characteristic function from the transform of
+        the BaseModel."""
 
         # Determine q-values.
         # We want very fine r-spacing so we can properly normalize f(r). This
diff --git a/src/diffpy/srfit/pdf/pdfparser.py b/src/diffpy/srfit/pdf/pdfparser.py
index 445835f7..f2d32ccd 100644
--- a/src/diffpy/srfit/pdf/pdfparser.py
+++ b/src/diffpy/srfit/pdf/pdfparser.py
@@ -109,7 +109,8 @@ class PDFParser(ProfileParser):
     _format = "PDF"
 
     def parseString(self, patstring):
-        """Parse a string and set the _x, _y, _dx, _dy and _meta variables.
+        """Parse a string and set the _x, _y, _dx, _dy and _meta
+        variables.
 
         When _dx or _dy cannot be obtained in the data format it is set to 0.
 
diff --git a/src/diffpy/srfit/sas/prcalculator.py b/src/diffpy/srfit/sas/prcalculator.py
index 17c63de6..4030aa94 100644
--- a/src/diffpy/srfit/sas/prcalculator.py
+++ b/src/diffpy/srfit/sas/prcalculator.py
@@ -116,7 +116,8 @@ def _inverted(self, x, c):
 
 
 class CFCalculator(PrCalculator):
-    """A class for calculating the characteristic function (CF) from data.
+    """A class for calculating the characteristic function (CF) from
+    data.
 
     This calculator produces
     f(r) = P(r) / 4 pi r**2
diff --git a/src/diffpy/srfit/sas/sasparser.py b/src/diffpy/srfit/sas/sasparser.py
index 1ddd48b3..12583d6b 100644
--- a/src/diffpy/srfit/sas/sasparser.py
+++ b/src/diffpy/srfit/sas/sasparser.py
@@ -91,7 +91,8 @@ class SASParser(ProfileParser):
     _format = "SAS"
 
     def parseFile(self, filename):
-        """Parse a file and set the _x, _y, _dx, _dy and _meta variables.
+        """Parse a file and set the _x, _y, _dx, _dy and _meta
+        variables.
 
         This wipes out the currently loaded data and selected bank number.
 
@@ -131,7 +132,8 @@ def parseFile(self, filename):
         return
 
     def parseString(self, patstring):
-        """Parse a string and set the _x, _y, _dx, _dy and _meta variables.
+        """Parse a string and set the _x, _y, _dx, _dy and _meta
+        variables.
 
         When _dx or _dy cannot be obtained in the data format it is set to 0.
 
diff --git a/src/diffpy/srfit/sas/sasprofile.py b/src/diffpy/srfit/sas/sasprofile.py
index a5ad4225..a4b313f7 100644
--- a/src/diffpy/srfit/sas/sasprofile.py
+++ b/src/diffpy/srfit/sas/sasprofile.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""Class for adapting a sas DataInfo objects to the Profile interface."""
+"""Class for adapting a sas DataInfo objects to the Profile
+interface."""
 
 __all__ = ["SASProfile"]
 
diff --git a/src/diffpy/srfit/srfit_app.py b/src/diffpy/srfit/srfit_app.py
new file mode 100644
index 00000000..65b92262
--- /dev/null
+++ b/src/diffpy/srfit/srfit_app.py
@@ -0,0 +1,33 @@
+import argparse
+
+from diffpy.srfit.version import __version__
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        prog="diffpy.srfit",
+        description=(
+            "Generalized code base for modeling problems.\n\n"
+            "For more information, visit: "
+            "https://github.com/diffpy/diffpy.srfit/"
+        ),
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+
+    parser.add_argument(
+        "--version",
+        action="store_true",
+        help="Show the program's version number and exit",
+    )
+
+    args = parser.parse_args()
+
+    if args.version:
+        print(f"diffpy.srfit {__version__}")
+    else:
+        # Default behavior when no arguments are given
+        parser.print_help()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/diffpy/srfit/structure/__init__.py b/src/diffpy/srfit/structure/__init__.py
index 2a34680e..f479cf50 100644
--- a/src/diffpy/srfit/structure/__init__.py
+++ b/src/diffpy/srfit/structure/__init__.py
@@ -12,9 +12,9 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""Modules and classes that adapt structure representations to the ParameterSet
-interface and automatic structure constraint generation from space group
-information."""
+"""Modules and classes that adapt structure representations to the
+ParameterSet interface and automatic structure constraint generation
+from space group information."""
 
 from diffpy.srfit.structure.sgconstraints import constrainAsSpaceGroup
 
diff --git a/src/diffpy/srfit/structure/objcrystparset.py b/src/diffpy/srfit/structure/objcrystparset.py
index 8cb427b9..62995ee6 100644
--- a/src/diffpy/srfit/structure/objcrystparset.py
+++ b/src/diffpy/srfit/structure/objcrystparset.py
@@ -12,7 +12,8 @@
 # See LICENSE_DANSE.txt for license information.
 #
 ##############################################################################
-"""Wrappers for adapting pyobjcryst.crystal.Crystal to a srfit ParameterSet.
+"""Wrappers for adapting pyobjcryst.crystal.Crystal to a srfit
+ParameterSet.
 
 This will adapt a Crystal or Molecule object from pyobjcryst into the
 ParameterSet interface. The following classes are adapted.
@@ -335,7 +336,8 @@ def wrapRestraints(self):
         return
 
     def wrapStretchModeParameters(self):
-        """Wrap the stretch modes implicit to the Molecule as Parameters.
+        """Wrap the stretch modes implicit to the Molecule as
+        Parameters.
 
         This will wrap StretchModeBondLengths and StretchModeBondAngles of the
         Molecule as Parameters. Note that this requires that the MolBondAtoms
@@ -1516,7 +1518,8 @@ def getValue(self):
 
 
 class ObjCrystDihedralAngleParameter(StretchModeParameter):
-    """Class for abstracting a dihedral angle in a Molecule to a Parameter.
+    """Class for abstracting a dihedral angle in a Molecule to a
+    Parameter.
 
     This wraps up a pyobjcryst.molecule.StretchModeTorsion object so that the
     angle defined by four MolAtoms ([a1-a2].[a3-a4]) in a Molecule can be used
diff --git a/src/diffpy/srfit/structure/sgconstraints.py b/src/diffpy/srfit/structure/sgconstraints.py
index c9dbc5b9..81c71de9 100644
--- a/src/diffpy/srfit/structure/sgconstraints.py
+++ b/src/diffpy/srfit/structure/sgconstraints.py
@@ -814,7 +814,8 @@ def _makeconstraint(parname, formula, scatterer, idx, ns={}):
 
 
 def _get_float(formula):
-    """Get a float from a formula string, or None if this is not possible."""
+    """Get a float from a formula string, or None if this is not
+    possible."""
     try:
         return eval(formula)
     except NameError:
diff --git a/src/diffpy/srfit/util/__init__.py b/src/diffpy/srfit/util/__init__.py
index 023b4256..c8c9b830 100644
--- a/src/diffpy/srfit/util/__init__.py
+++ b/src/diffpy/srfit/util/__init__.py
@@ -18,8 +18,8 @@
 
 
 def sortKeyForNumericString(s):
-    """Compute key for sorting strings according to their integer numeric
-    value.
+    """Compute key for sorting strings according to their integer
+    numeric value.
 
     Each string gets split to string and integer segments to create keys
     for comparison.  Signs, decimal points and exponents are ignored.
diff --git a/src/diffpy/srfit/util/argbinders.py b/src/diffpy/srfit/util/argbinders.py
index 28cd5144..71db89b4 100644
--- a/src/diffpy/srfit/util/argbinders.py
+++ b/src/diffpy/srfit/util/argbinders.py
@@ -16,7 +16,8 @@
 
 
 class bind2nd(object):
-    """Freeze second argument of a callable object to a given constant."""
+    """Freeze second argument of a callable object to a given
+    constant."""
 
     def __init__(self, func, arg1):
         """Freeze the second argument of function func to arg1."""
diff --git a/src/diffpy/srfit/util/weakrefcallable.py b/src/diffpy/srfit/util/weakrefcallable.py
index 287d2e47..042e1812 100644
--- a/src/diffpy/srfit/util/weakrefcallable.py
+++ b/src/diffpy/srfit/util/weakrefcallable.py
@@ -69,7 +69,8 @@ def __init__(self, f, fallback=None):
         return
 
     def __call__(self, *args, **kwargs):
-        """Call the wrapped method if the weak-referenced object is alive.
+        """Call the wrapped method if the weak-referenced object is
+        alive.
 
         If that object does not exist and the fallback function is defined,
         call the fallback function instead.
@@ -122,7 +123,8 @@ def __getstate__(self):
         return state
 
     def __setstate__(self, state):
-        """Restore the weak reference in this wrapper upon unpickling."""
+        """Restore the weak reference in this wrapper upon
+        unpickling."""
         (self._class, nm, self.fallback, mobj) = state
         self.function = getattr(self._class, nm)
         if mobj is None:
diff --git a/src/diffpy/srfit/version.py b/src/diffpy/srfit/version.py
index f0833049..c62be11e 100644
--- a/src/diffpy/srfit/version.py
+++ b/src/diffpy/srfit/version.py
@@ -3,9 +3,10 @@
 #
 # (c) 2008-2025 The Trustees of Columbia University in the City of New York.
 # All rights reserved.
+# (c) 2026-present The DiffPy Team. All rights reserved.
 #
-# File coded by: Christopher Farrow, Pavol Juhas, and members of the
-# Billinge Group.
+# File coded by: Christopher Farrow, Pavol Juhas, Caden Myers,
+# Simon J. L. Billinge, and members of the DiffPy community.
 #
 # See GitHub contributions for a more detailed list of contributors.
 # https://github.com/diffpy/diffpy.srfit/graphs/contributors
@@ -19,8 +20,9 @@
 #  __all__ = ["__date__", "__git_commit__", "__timestamp__", "__version__"]
 
 # obtain version information
-from importlib.metadata import version
+from importlib.metadata import PackageNotFoundError, version
 
-__version__ = version("diffpy.srfit")
-
-# End of file
+try:
+    __version__ = version("diffpy.srfit")
+except PackageNotFoundError:
+    __version__ = "unknown"
diff --git a/tests/conftest.py b/tests/conftest.py
index 61bfa490..45c6308a 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -90,7 +90,8 @@ def pyobjcryst_available():
 
 @pytest.fixture(scope="session")
 def datafile():
-    """Fixture to load a test data file from the testdata package directory."""
+    """Fixture to load a test data file from the testdata package
+    directory."""
 
     def _datafile(filename):
         return importlib.resources.files("tests.testdata").joinpath(filename)
@@ -166,7 +167,8 @@ def build_recipe_one_contribution():
 
 @pytest.fixture()
 def build_recipe_two_contributions():
-    """Helper to build a recipe with two physically related contributions."""
+    """Helper to build a recipe with two physically related
+    contributions."""
     profile1 = Profile()
     x = linspace(0, pi, 50)
     y1 = sin(x)  # amplitude=1, freq=1
diff --git a/tests/test_contribution.py b/tests/test_contribution.py
index 001eee42..ef388b6b 100644
--- a/tests/test_contribution.py
+++ b/tests/test_contribution.py
@@ -80,7 +80,8 @@ def test_add_profile_generator(self):
         return
 
     def testInteraction(self):
-        """Test the interaction between the profile and profile generator."""
+        """Test the interaction between the profile and profile
+        generator."""
         fc = self.fitcontribution
         profile = self.profile
         gen = self.gen
@@ -178,7 +179,8 @@ def test_getResidualEquation(self):
         return
 
     def test_releaseOldEquations(self):
-        """Ensure EquationFactory does not hold to obsolete Equations."""
+        """Ensure EquationFactory does not hold to obsolete
+        Equations."""
         fc = self.fitcontribution
         self.assertEqual(0, len(fc._eqfactory.equations))
         for i in range(5):
@@ -191,7 +193,8 @@ def test_releaseOldEquations(self):
         return
 
     def test_registerFunction(self):
-        """Ensure registered function works after second set_equation call."""
+        """Ensure registered function works after second set_equation
+        call."""
         fc = self.fitcontribution
         fc.registerFunction(_fsquare, name="fsquare")
         fc.set_equation("fsquare")
diff --git a/tests/test_fitrecipe.py b/tests/test_fitrecipe.py
index 39af10e8..6deb1cad 100644
--- a/tests/test_fitrecipe.py
+++ b/tests/test_fitrecipe.py
@@ -410,9 +410,9 @@ def test_add_and_remove_parameter_set():
 
 
 def test_add_contribution(capturestdout):
-    """Duplicated test of PrintFitHooks except addContribution method has
-    changed to the new add_contribution method. This is because addContribution
-    is deprecated.
+    """Duplicated test of PrintFitHooks except addContribution method
+    has changed to the new add_contribution method. This is because
+    addContribution is deprecated.
 
     Remove this test after addContribution is removed and update
     testPrintFitHook to use add_contribution instead of addContribution.
@@ -570,8 +570,8 @@ def build_recipe_from_datafile(datafile):
 
 
 def build_recipe_from_datafile_deprecated(datafile):
-    """Duplicate of build_recipe_from_datafile to use deprecated loadParsedData
-    method.
+    """Duplicate of build_recipe_from_datafile to use deprecated
+    loadParsedData method.
 
     Remove in version 4.0.0.
     """
diff --git a/tests/test_objcrystparset.py b/tests/test_objcrystparset.py
index 5150ae54..10c96ee9 100644
--- a/tests/test_objcrystparset.py
+++ b/tests/test_objcrystparset.py
@@ -650,7 +650,8 @@ def sgsEquivalent(self, sg1, sg2):
     # FIXME: only about 50% of the spacegroups pass the assertion
     # test disabled even if cctbx is installed
     def xtestCreateSpaceGroup(self):
-        """Check all sgtbx space groups for proper conversion to SpaceGroup."""
+        """Check all sgtbx space groups for proper conversion to
+        SpaceGroup."""
 
         try:
             from cctbx import sgtbx
diff --git a/tests/test_profilegenerator.py b/tests/test_profilegenerator.py
index aeacf690..e4ea0fa3 100644
--- a/tests/test_profilegenerator.py
+++ b/tests/test_profilegenerator.py
@@ -48,7 +48,8 @@ def testOperation(self):
         return
 
     def testUpdate(self):
-        """Update and change the profile to make sure generator is flushed."""
+        """Update and change the profile to make sure generator is
+        flushed."""
         gen = self.gen
         prof = self.profile
 
diff --git a/tests/test_sgconstraints.py b/tests/test_sgconstraints.py
index 4288e530..11859a9f 100644
--- a/tests/test_sgconstraints.py
+++ b/tests/test_sgconstraints.py
@@ -179,7 +179,8 @@ def _alltests(par):
 
 
 def test_constrain_as_space_group_args(pyobjcryst_available, datafile):
-    """Test the arguments processing of constrainAsSpaceGroup function."""
+    """Test the arguments processing of constrainAsSpaceGroup
+    function."""
     if not pyobjcryst_available:
         pytest.skip("pyobjcrysta package not available")