diff --git a/source/recipes/nixpkgs-pkg/cli/main.adoc0 b/source/recipes/nixpkgs-pkg/cli/main.adoc0
new file mode 100644
index 0000000..9dd549f
--- /dev/null
+++ b/source/recipes/nixpkgs-pkg/cli/main.adoc0
@@ -0,0 +1,9 @@
+= From the command line
+
+....
+$# echo '$ nix-shell -p "[hello cowsay]"'
+$# nix-shell -p "[hello cowsay]" --run bash <<EOL
+$ hello
+$ cowsay "moo"
+$# EOL
+....
diff --git a/source/recipes/python-nixpkg/shell/Main.py b/source/recipes/python-nixpkg/shell/Main.py
new file mode 100644
index 0000000..9a82d6d
--- /dev/null
+++ b/source/recipes/python-nixpkg/shell/Main.py
@@ -0,0 +1,8 @@
+from html_sanitizer import Sanitizer
+sanitizer = Sanitizer()  # default configuration
+
+original='<span style="font-weight:bold">some text</span>'
+print('original: ', original)
+
+sanitized=sanitizer.sanitize(original)
+print('sanitized: ', sanitized)
diff --git a/source/recipes/python-nixpkg/shell/main.adoc0 b/source/recipes/python-nixpkg/shell/main.adoc0
new file mode 100644
index 0000000..a1cbc7c
--- /dev/null
+++ b/source/recipes/python-nixpkg/shell/main.adoc0
@@ -0,0 +1,24 @@
+= In `shell.nix`
+
+[source,nix,linenums]
+.shell.nix
+....
+include::shell.nix[]
+....
+
+Here's a short Python program that uses it.
+
+[source,python,linenums]
+.Main.hs
+....
+include::Main.py[]
+....
+
+Here's a demonstration using the program.
+
+....
+$# echo '$ nix-shell'
+$# nix-shell --run bash <<EOL
+$ python Main.py
+$# EOL
+....
diff --git a/source/recipes/python-nixpkg/shell/shell.nix b/source/recipes/python-nixpkg/shell/shell.nix
new file mode 100644
index 0000000..74cdb70
--- /dev/null
+++ b/source/recipes/python-nixpkg/shell/shell.nix
@@ -0,0 +1,9 @@
+with (import <nixpkgs> {});
+let
+  customPython = python3.withPackages (ps: with ps; [ html_sanitizer ]);
+in
+mkShell {
+  buildInputs = [
+                  customPython
+                ];
+}