diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..1626cb6
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,12 @@
+version: 2
+
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..53c24fc
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,67 @@
+---
+name: Tests
+
+on:
+  pull_request: ~
+  push:
+    branches: [ main ]
+
+  # Allow job to be triggered manually.
+  workflow_dispatch:
+
+# Cancel in-progress jobs when pushing to the same branch.
+concurrency:
+  cancel-in-progress: true
+  group: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+
+  tests:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest"]
+        python-version: ["3.11"]
+
+    env:
+      OS: ${{ matrix.os }}
+      PYTHON: ${{ matrix.python-version }}
+
+    name: Python ${{ matrix.python-version }} on OS ${{ matrix.os }}
+    steps:
+
+    - name: Acquire sources
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+        architecture: x64
+        cache: 'pip'
+        cache-dependency-path: 'pyproject.toml'
+
+    - name: Setup project
+      run: |
+
+        # `setuptools 0.64.0` adds support for editable install hooks (PEP 660).
+        # https://github.com/pypa/setuptools/blob/main/CHANGES.rst#v6400
+        pip install "setuptools>=64" --upgrade
+
+        # Install package in editable mode.
+        pip install --use-pep517 --prefer-binary --editable=.[test,develop]
+
+    - name: Run linter and software tests
+      run: |
+        poe check
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        files: ./coverage.xml
+        flags: unittests
+        env_vars: OS,PYTHON
+        name: codecov-umbrella
+        fail_ci_if_error: false
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7c76566
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+__pycache__
+.idea
+.venv*
+*.egg-info
+.coverage
+coverage.xml
+*.pyc
+dist
diff --git a/CHANGES.md b/CHANGES.md
new file mode 100644
index 0000000..938633b
--- /dev/null
+++ b/CHANGES.md
@@ -0,0 +1,7 @@
+# Changes for pueblo
+
+
+## Unreleased
+
+## 2023-10-30 0.0.1
+- Initial thing
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..0a04128
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..1eeef06
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1 @@
+prune tests
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5c05397
--- /dev/null
+++ b/README.md
@@ -0,0 +1,56 @@
+# Pueblo - a Python toolbox library
+
+[![Tests](https://github.com/pyveci/pueblo/actions/workflows/main.yml/badge.svg)](https://github.com/pyveci/pueblo/actions/workflows/main.yml)
+[![Test coverage](https://img.shields.io/codecov/c/gh/pyveci/pueblo.svg)](https://codecov.io/gh/pyveci/pueblo/)
+[![Python versions](https://img.shields.io/pypi/pyversions/pueblo.svg)](https://pypi.org/project/pueblo/)
+
+[![License](https://img.shields.io/github/license/pyveci/pueblo.svg)](https://github.com/pyveci/pueblo/blob/main/LICENSE)
+[![Status](https://img.shields.io/pypi/status/pueblo.svg)](https://pypi.org/project/pueblo/)
+[![PyPI](https://img.shields.io/pypi/v/pueblo.svg)](https://pypi.org/project/pueblo/)
+[![Downloads](https://pepy.tech/badge/pueblo/month)](https://pypi.org/project/pueblo/)
+
+
+<!-- » [Documentation] -->
+
+» [Changelog]
+| [PyPI]
+| [Issues]
+| [Source code]
+| [License]
+
+[Changelog]: https://github.com/pyveci/pueblo/blob/main/CHANGES.md
+[Documentation]: https://pueblo.readthedocs.io/
+[Issues]: https://github.com/pyveci/pueblo/issues
+[License]: https://github.com/pyveci/pueblo/blob/main/LICENSE
+[PyPI]: https://pypi.org/project/pueblo/
+[Source code]: https://github.com/pyveci/pueblo
+
+
+## About
+
+- A Python toolbox library.
+- Contains Python code duplicated too often elsewhere.
+- Finally, it is in one place.
+- Here be dragons and gems.
+
+
+## Setup
+
+```shell
+pip install --upgrade pueblo
+```
+
+After installation, you can verify if it was successful.
+```shell
+pueblo --version
+```
+
+
+## Usage
+
+Read the source.
+
+
+## Prior Art
+
+- https://pypi.org/project/boltons/
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..4ccde74
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,221 @@
+# ==================
+# Project definition
+# ==================
+
+# Derived from https://peps.python.org/pep-0621/
+
+[build-system]
+build-backend = "setuptools.build_meta"
+requires = [
+  "setuptools>=42", # At least v42 of setuptools required.
+  "versioningit",
+]
+
+[tool.versioningit.vcs]
+method = "git"
+default-tag = "0.0.0"
+
+[project]
+name = "pueblo"
+description = "Pueblo - a Python toolbox library."
+readme = "README.md"
+requires-python = ">=3.8"
+license = { text = "LGPL 3, EUPL 1.2" }
+keywords = [
+  "pueblo",
+  "general purpose",
+  "library",
+  "mixed",
+]
+authors = [
+  {name = "Andreas Motl", email = "andreas.motl@panodata.org"},
+]
+classifiers = [
+  "Development Status :: 3 - Alpha",
+  "Environment :: Console",
+  "Intended Audience :: Customer Service",
+  "Intended Audience :: Developers",
+  "Intended Audience :: Education",
+  "Intended Audience :: Information Technology",
+  "Intended Audience :: Telecommunications Industry",
+  "License :: OSI Approved :: European Union Public Licence 1.2 (EUPL 1.2)",
+  "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
+  "Operating System :: MacOS :: MacOS X",
+  "Operating System :: POSIX :: Linux",
+  "Operating System :: Unix",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3 :: Only",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Topic :: Communications",
+  "Topic :: Education",
+  "Topic :: Software Development :: Libraries",
+  "Topic :: Text Processing",
+  "Topic :: Utilities",
+]
+
+dynamic = [
+  "version",
+]
+
+dependencies = [
+]
+
+[project.optional-dependencies]
+cli = [
+  "click<9",
+  "click-aliases<2",
+  "colorlog<7",
+]
+env = [
+  "python-dotenv<2",
+]
+develop = [
+  "black<24",
+  "mypy==1.5.1",
+  "poethepoet<1",
+  "pyproject-fmt<1.2",
+  "ruff==0.0.291",
+  "validate-pyproject<0.15",
+]
+release = [
+  "build<2",
+  "twine<5",
+]
+test = [
+  "nbclient<0.9",
+  "pytest<8",
+  "pytest-cov<5",
+  "pytest-mock<4",
+]
+[project.scripts]
+pueblo = "pueblo.cli:cli"
+[tool.setuptools]
+# https://setuptools.pypa.io/en/latest/userguide/package_discovery.html
+packages = ["pueblo"]
+
+[project.urls]
+changelog = "https://github.com/pyveci/pueblo/blob/main/CHANGES.md"
+documentation = "https://github.com/pyveci/pueblo"
+homepage = "https://github.com/pyveci/pueblo"
+repository = "https://github.com/pyveci/pueblo"
+[tool.black]
+line-length = 120
+
+# extend-exclude = ""
+
+[tool.isort]
+profile = "black"
+skip_glob = "**/site-packages/**"
+skip_gitignore = false
+
+[tool.pytest.ini_options]
+minversion = "2.0"
+addopts = """
+  -rfEX -p pytester --strict-markers --verbosity=3
+  --cov --cov-report=term-missing --cov-report=xml
+  """
+log_level = "DEBUG"
+log_cli_level = "DEBUG"
+testpaths = ["tests"]
+xfail_strict = true
+markers = [
+]
+
+[tool.coverage.run]
+branch = false
+source = ["pueblo"]
+omit = [
+    "tests/*",
+]
+
+[tool.coverage.report]
+fail_under = 0
+show_missing = true
+
+[tool.mypy]
+packages = ["pueblo"]
+exclude = [
+]
+check_untyped_defs = true
+ignore_missing_imports = true
+implicit_optional = true
+install_types = true
+no_implicit_optional = true
+non_interactive = true
+show_error_codes = true
+strict_equality = true
+warn_unused_ignores = true
+warn_redundant_casts = true
+
+[tool.ruff]
+line-length = 120
+
+select = [
+  # Bandit
+  "S",
+  # Bugbear
+  "B",
+  # Builtins
+  "A",
+  # comprehensions
+  "C4",
+  # eradicate
+  "ERA",
+  # flake8-2020
+  "YTT",
+  # isort
+  "I",
+  # pandas-vet
+  "PD",
+  # print
+  "T20",
+  # Pycodestyle
+  "E",
+  "W",
+  # Pyflakes
+  "F",
+  # return
+  "RET",
+]
+
+extend-exclude = [
+  "example_*",
+]
+
+[tool.ruff.per-file-ignores]
+"tests/*" = ["S101"]  # Use of `assert` detected
+
+
+# ===================
+# Tasks configuration
+# ===================
+
+[tool.poe.tasks]
+format = [
+  { cmd = "black ." },
+  # Configure Ruff not to auto-fix (remove!):
+  # Ignore unused imports (F401), unused variables (F841), `print` statements (T201), and commented-out code (ERA001).
+  { cmd = "ruff --fix --ignore=ERA --ignore=F401 --ignore=F841 --ignore=T20 --ignore=ERA001 ." },
+  { cmd = "pyproject-fmt pyproject.toml" },
+]
+
+lint = [
+  { cmd = "ruff ." },
+  { cmd = "black --check ." },
+  { cmd = "validate-pyproject pyproject.toml" },
+  { cmd = "mypy" },
+]
+test = [
+  { cmd = "pytest" },
+]
+build = { cmd = "python -m build" }
+check = ["lint", "test"]
+
+release = [
+  { cmd = "python -m build" },
+  { cmd = "twine upload --skip-existing dist/*.tar.gz dist/*.whl" },
+]