diff --git a/doc/manual/src/command-ref/nix-shell.md b/doc/manual/src/command-ref/nix-shell.md
index 1eaf3c36a..a4dd051fc 100644
--- a/doc/manual/src/command-ref/nix-shell.md
+++ b/doc/manual/src/command-ref/nix-shell.md
@@ -202,14 +202,14 @@ For example, here is a Python script that depends on Python and the
 
 ```python
 #! /usr/bin/env nix-shell
-#! nix-shell -i python --packages python pythonPackages.prettytable
+#! nix-shell -i python3 --packages python3 python3Packages.prettytable
 
 import prettytable
 
 # Print a simple table.
 t = prettytable.PrettyTable(["N", "N^2"])
 for n in range(1, 10): t.add_row([n, n * n])
-print t
+print(t)
 ```
 
 Similarly, the following is a Perl script that specifies that it