py-marshmallow: Add new package (#29764)

* py-marshmallow: Add new package

* Modify py-packaging dependency type

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

* Add run dependency to py-packaging

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

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

var/spack/repos/builtin/packages/py-marshmallow/package.py

@@ -0,0 +1,22 @@
+# Copyright 2013-2022 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 import *
+
+
+class PyMarshmallow(PythonPackage):
+    """marshmallow is an ORM/ODM/framework-agnostic library for converting
+    complex datatypes, such as objects, to and from native Python datatypes."""
+
+    homepage = "https://github.com/marshmallow-code/marshmallow"
+    pypi     = "marshmallow/marshmallow-3.15.0.tar.gz"
+
+    maintainers = ['haralmha']
+
+    version('3.15.0', sha256='2aaaab4f01ef4f5a011a21319af9fce17ab13bf28a026d1252adab0e035648d5')
+
+    depends_on('python@3.7:', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')
+    depends_on('py-packaging', type=('build', 'run'))