Add extra version of py-multiprocess (#15043)

* Add extra version of py-multiprocess

* Update dependency version

* Add url_for_version

* Flake-8

* Update package.py

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

@@ -12,6 +12,7 @@ class PyMultiprocess(PythonPackage):
     homepage = "https://github.com/uqfoundation/multiprocess"
     url = "https://pypi.io/packages/source/m/multiprocess/multiprocess-0.70.5.zip"
 
+    version('0.70.7', sha256='3394f1fbd0d87112690a877e49eb7917d851ee8d822294d522dd4deae12febdb')
     version('0.70.5', sha256='c4c196f3c4561dc1d78139c3e73709906a222d2fc166ef3eef895d8623df7267')
     version('0.70.4', sha256='a692c6dc8392c25b29391abb58a9fbdc1ac38bca73c6f27d787774201e68e12c')
 
@@ -19,3 +20,14 @@ class PyMultiprocess(PythonPackage):
 
     depends_on('py-setuptools@0.6:', type='build')
     depends_on('py-dill@0.2.6:', type=('build', 'run'))
+    depends_on('py-dill@0.2.9:', type=('build', 'run'), when='@0.70.7:')
+
+    def url_for_version(self, version):
+        url = self.url.rsplit('/', 1)[0]
+        if version >= Version('0.70.7'):
+            url += '/multiprocess-{0}.tar.gz'
+        else:
+            url += '/multiprocess-{0}.zip'
+
+        url = url.format(version)
+        return url