I think this is packaged correctly

newfol/newfol.py

@@ -1,7 +1,6 @@
 #! /usr/bin/python3
 
 import sys
-sys.path.insert(0, sys.path[0] + "/lib")
 
 import gettext
 import locale
@@ -12,7 +11,7 @@ import newfol.main
 from gettext import gettext as _
 from newfol.exception import LocaleError
 
-if __name__ == '__main__':
+def main():
     try:
         locale.setlocale(locale.LC_ALL, '')
         gettext.bindtextdomain('newfol')
@@ -28,3 +27,6 @@ if __name__ == '__main__':
     except newfol.exception.FilemanipError as e:
         sys.stderr.write(_("E: %s\n") % e)
         sys.exit(2)
+
+if __name__ == "__main__":
+    main()

setup.py

@@ -0,0 +1,14 @@
+import setuptools
+
+setuptools.setup(
+    name = "NewFol",
+    version = "0.0.1",
+    author = "Brian",
+    description = "Database program for Peter Hodgson",
+    scripts = ["newfol/newfol.py"],
+    entry_points = {
+        'console_scripts': [
+            'newfol = newfol.__main__:main'
+        ]
+    }
+)

shell.nix

@@ -0,0 +1,22 @@
+with import <nixpkgs> {};
+let
+  pythonPackages = pkgs.python3Packages;
+  newfol =
+    pythonPackages.buildPythonPackage rec {
+      name = "newfol";
+      src = ./.;
+      propagatedBuildInputs = [
+        pythonPackages.urwid
+      ];
+
+      postInstall = ''
+        mv -v $out/bin/newfol.py $out/bin/newfol
+      '';
+    };
+in
+pkgs.mkShell {
+  buildInputs = with pythonPackages; [
+    # newfol
+  ];
+  packages = [ newfol ];
+}