Add py-mlflow and its dependencies (#34463)

* Add py-mlflow and its dependencies
* mlflow: fix syntax error in package.py
* py-mlflow: cleanup
  Process review remarks, add missing dependencies, add skinny variant
* Apply suggestions from code review
* Fix flake8 issues
* More formatting fixes
* Fix py-waitress dependency version
* py-mlflow: platform-specific dependency
* Update var/spack/repos/builtin/packages/py-mlflow/package.py
* Update var/spack/repos/builtin/packages/py-mlflow/package.py
* Process review remarks
* Fix typo in dependency version
* py-shap: fix dependencies
* py-arrow: fix dependencies
* py-slicer: remove py-setuptools explicit version
* py-pyarrow: dataset variant and pass options through environment
  It appears there are some issues when using `pip install` instead of
  `python setup.py` - this setup_build_environment should fix that.
* py-pyarrow: review remark
* Decouple setup_build_environment from install_options
* py-pyarrow: style
* Bump licenses to 2023

---------

Co-authored-by: Tamara Dahlgren <35777542+tldahlgren@users.noreply.github.com>
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
Co-authored-by: Matthias Wolf <matthias.wolf@epfl.ch>

1 files changed, 17 insertions, 0 deletions

diff --git a/var/spack/repos/builtin/packages/py-waitress/package.py b/var/spack/repos/builtin/packages/py-waitress/package.py
new file mode 100644
index 0000000000..d09d6b2d69
--- /dev/null
+++ b/var/spack/repos/builtin/packages/py-waitress/package.py
@@ -0,0 +1,17 @@
+# Copyright 2013-2023 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class PyWaitress(PythonPackage):
+    """Waitress: a production-quality pure-Python WSGI server with very acceptable performance."""
+
+    homepage = "https://github.com/Pylons/waitress/"
+    pypi = "waitress/waitress-2.1.2.tar.gz"
+
+    version("2.1.2", sha256="780a4082c5fbc0fde6a2fcfe5e26e6efc1e8f425730863c04085769781f51eba")
+
+    depends_on("py-setuptools@41:", type="build")