more packaging fixes

default.nix

@@ -53,11 +53,17 @@ in
       #   this another way, dependencies have undetected dependencies, easier
       #   to just use the wheel.
       collections-extended = "wheel";
+      # same as collections-extended
+      isort = "wheel";
 
       # From nixpkgs or sdist, fails with
       # cp: cannot stat 'benchmark/': No such file or directory
       # cp: cannot stat 'tests/': No such file or directory
       tomli = "wheel";
+
+      # repo re-org or something?
+      # find: ‘hypothesis-6.32.1/hypothesis-python’: No such file or directory
+      hypothesis = "wheel";
     };
   in
     rec {

setup.cfg

@@ -53,6 +53,10 @@ install_requires =
     # install cross-platform.
     colorama
 
+    # Python 3 transition
+    six
+    future
+
 [options.extras_require]
 test = coverage; fixtures; testtools; hypothesis
 

shell.nix

@@ -6,7 +6,7 @@ let
   inherit (tests) pkgs;
 in
 pkgs.mkShell {
-  packages = [
+  buildInputs = [
     tests.python
     tests.lint-python
     pkgs.niv