New package: py-promise (#23936)

* New package: py-promise

* removed test deps, added missing dep

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

@@ -0,0 +1,24 @@
+# Copyright 2013-2021 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 PyPromise(PythonPackage):
+    """This is a implementation of Promises in Python. It is a super set of
+    Promises/A+ designed to have readable, performant code and to provide
+    just the extensions that are absolutely necessary for
+    using promises in Python."""
+
+    homepage = "https://github.com/syrusakbary/promise"
+    pypi     = "promise/promise-2.3.tar.gz"
+
+    maintainers = ['dorton21']
+
+    version('2.3', sha256='dfd18337c523ba4b6a58801c164c1904a9d4d1b1747c7d5dbf45b693a49d93d0')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-six', type=('build', 'run'))
+    depends_on('py-typing@3.6.4:', when='^python@:3.4.999', type=('build', 'run'))