From 6ff89b8a4b312ad580b2639cfc4b3ed5507a4856 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Trevor=20Ba=C4=8Da?= <trevor.baca@gmail.com>
Date: Thu, 2 Jan 2025 12:23:08 -0500
Subject: [PATCH] Add Python 3.13, 3.14-dev to GitHub Actions. (#1600)

---
 .github/workflows/main.yml |  2 +-
 README.rst                 |  2 +-
 abjad/_version.py          |  2 +-
 docs/source/conf.py        |  4 ++--
 setup.py                   | 19 +------------------
 5 files changed, 6 insertions(+), 23 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5c0b43cdad..82ef40f45d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14-dev"]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/README.rst b/README.rst
index 13098af1a3..ce5b89587f 100644
--- a/README.rst
+++ b/README.rst
@@ -1,4 +1,4 @@
-Abjad 3.19
+Abjad 3.20
 ==========
 
 Abjad helps composers build up complex pieces of music notation in iterative and
diff --git a/abjad/_version.py b/abjad/_version.py
index ebede8d74d..0d40391d34 100644
--- a/abjad/_version.py
+++ b/abjad/_version.py
@@ -1,3 +1,3 @@
-__version_info__ = (3, 19)
+__version_info__ = (3, 20)
 __version__ = ".".join(str(_) for _ in __version_info__[:2])
 __version__ += "".join(__version_info__[2:])
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 0f56bbf0f6..ab396e14c5 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -3,7 +3,7 @@
 ### GENERAL SPHINX SETTINGS ###
 ### https://www.sphinx-doc.org/en/master/usage/configuration.html ###
 
-copyright = "2008-2024, Trevor Bača & Josiah Wolf Oberholtzer."
+copyright = "2008-2025, Trevor Bača & Joséphine Oberholtzer."
 extensions = [
     "abjad.ext.sphinx",
     "sphinx.ext.autodoc",
@@ -33,7 +33,7 @@
     # navigation_depth=1 makes sidebar completely flat;
     # leave flat navigation in place forever:
     "navigation_depth": 1,
-    "style_nav_header_background": "#ddaa77",
+    "style_nav_header_background": "#eeccaa",
 }
 project = "Abjad"
 release = abjad.__version__
diff --git a/setup.py b/setup.py
index e9957a377d..f027347838 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,5 @@
 #! /usr/bin/env python
 import os
-import sys
 
 import setuptools
 
@@ -15,27 +14,12 @@ def get_abjad_version():
     return __version__
 
 
-def check_python_version(abjad_version):
-    CURRENT_PYTHON = sys.version_info[:2]
-    SUPPORTED_PYTHONS = [(3, 10), (3, 11), (3, 12)]
-    if CURRENT_PYTHON not in SUPPORTED_PYTHONS:
-        current_python = ".".join([str(_) for _ in CURRENT_PYTHON])
-        supported_pythons = ", ".join([f"{_[0]}.{_[1]}" for _ in SUPPORTED_PYTHONS])
-        string = f"This is Abjad {abjad_version},"
-        string += f" which supports Python {supported_pythons}.\n"
-        string += "\n"
-        string += "But it looks like you're trying to install Abjad"
-        string += f" with Python {current_python}."
-        sys.stderr.write(string)
-        sys.exit(1)
-
-
 description = "Abjad is a Python API for building LilyPond files."
 
 with open("README.rst", "r") as file_pointer:
     long_description = file_pointer.read()
 
-author = ["Trevor Bača", "Josiah Wolf Oberholtzer"]
+author = ["Trevor Bača", "Joséphine Oberholtzer"]
 
 author_email = [
     "trevor.baca@gmail.com",
@@ -80,7 +64,6 @@ def check_python_version(abjad_version):
 
 if __name__ == "__main__":
     version = get_abjad_version()
-    check_python_version(version)
     setuptools.setup(
         author=", ".join(author),
         author_email=", ".join(author_email),