py-zfit-physics: new package (#43696)

* Added package
* Fix base class
   Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
* fix: copyright

---------

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

var/spack/repos/builtin/packages/py-zfit-physics/package.py

@@ -0,0 +1,29 @@
+# Copyright Spack Project Developers. See COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+
+from spack.package import *
+
+
+class PyZfitPhysics(PythonPackage):
+    """Tools and models to extend zfit with physics specific content."""
+
+    homepage = "https://github.com/zfit/zfit-physics"
+    pypi = "zfit-physics/zfit_physics-0.7.0.tar.gz"
+
+    maintainers("jonas-eschle", "ikrommyd")
+    license("BSD-3-Clause", checked_by="jonas-eschle")
+
+    tags = ["likelihood", "statistics", "inference", "fitting", "hep"]
+
+    version("0.7.0", sha256="5d65becff7265a12d9b62a8476c5359e75ec10d6ac0fd84dfa39eb82b6693cda")
+
+    depends_on("py-setuptools@42:", type="build")
+    depends_on("py-setuptools-scm@3.4:+toml", type="build")
+    depends_on("py-setuptools-scm-git-archive", type="build")
+
+    # TODO: remove "build" once fixed in spack that tests need "run", not "build"
+    with default_args(type=("build", "run")):
+        depends_on("python@3.9:", when="@0.7:")
+        depends_on("py-zfit@0.20:", when="@0.7:")