Set up minimal Python packaging

default.nix

 { pkgs ? import <nixpkgs> { } }:
-pkgs.stdenv.mkDerivation rec {
-  version = "0.0";
-  name = "secure-access-token-authorizer-${version}";
-  depsBuildBuild = [ pkgs.python37Packages.sphinx ];
-}
+pkgs.python37Packages.callPackage ./secure-access-token-authorizer.nix { }

secure-access-token-authorizer.nix

+{ buildPythonPackage, sphinx }:
+buildPythonPackage rec {
+  version = "0.0";
+  name = "secure-access-token-authorizer-${version}";
+  src = ./.;
+  depsBuildBuild = [ sphinx ];
+}

setup.cfg

+[metadata]
+name = Secure Access Token Authorizer
+version = attr: _secureaccesstokenauthorizer.__version__
+description = A `Tahoe-LAFS`_ storage-system plugin which authorizes storage operations based on privacy-respecting tokens.
+long_description = file: README.rst, CHANGELOG.rst, LICENSE-2.0.txt
+keywords = tahoe-lafs, storage, privacy, cryptography
+license = Apache 2.0
+classifiers =
+    Framework :: Twisted
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 2
+    Programming Language :: Python :: 2.7
+author = PrivateStorage.io, LLC
+maintainer = PrivateStorage.io, LLC
+home-page = https://privatestorage.io/
+author-email = support@privatestorage.io
+platform = POSIX
+
+[options]
+package_dir=
+    =src
+packages=find:
+
+[options.packages.find]
+where=src

setup.py

+from setuptools import setup
+
+setup()

src/_secureaccesstokenauthorizer/__init__.py

+# Copyright 2019 PrivateStorage.io, LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+__version__ = "0.0"