diff --git a/README.md b/README.md
index 888cc11..650f930 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ Download the `.nvda-addon` file from [GitHub Releases](https://github.com/InfiAr
 
 ## Getting started
 
-1. Open a code file in Notepad, for example [samples/latihan.py](samples/latihan.py) from this repository. Its first lines say what to try where.
+1. Open a code file in Notepad, for example [samples/practice.py](samples/practice.py) from this repository (in Indonesian: [samples/latihan.py](samples/latihan.py)). Its first lines say what to try where.
 2. Move up and down with the arrow keys and listen to the tones rise and fall.
 3. Press NVDA+shift+K, then W, to hear where you are. NVDA+shift+K, then H, lists every command, and control+shift+P lists them with their keys.
 4. Press control+F5 to run it.
@@ -91,7 +91,7 @@ The build writes `codeCompass-<version>.nvda-addon`. It needs no SCons or gettex
 - `addon/sounds/`: Visual Studio Code's accessibility signal sounds, as WAV files.
 - `addon/locale/id/LC_MESSAGES/nvda.po`: the Indonesian translation. `tools/update_po.py` rewrites it to match the messages in the code, and a test fails when a message has no translation.
 - `tests/`: analyzer tests, translation checks and tests of the plugin against stubbed NVDA and wx modules.
-- `samples/`: files to try the add-on with: `latihan.py` walks through the features, `rusak.js` is broken on purpose.
+- `samples/`: files to try the add-on with: `practice.py` (and `latihan.py`, the same in Indonesian) walks through the features, `rusak.js` is broken on purpose.
 
 ## Contributing
 
diff --git a/addon/doc/en/readme.md b/addon/doc/en/readme.md
index e97a1d3..cfacca3 100644
--- a/addon/doc/en/readme.md
+++ b/addon/doc/en/readme.md
@@ -68,7 +68,7 @@ Bookmarks are kept per file, also after closing Notepad or restarting NVDA. Each
 
 When you come back to Notepad and another program (an editor, a code generator, Git) has changed the open file, Code Compass notices:
 
-- With no unsaved changes, the file is reloaded right away and Code Compass says what changed, for example "latihan.py changed on disk and was reloaded: 1 line changed, 2 lines added". The caret stays on its line and bookmarks follow their lines.
+- With no unsaved changes, the file is reloaded right away and Code Compass says what changed, for example "practice.py changed on disk and was reloaded: 1 line changed, 2 lines added". The caret stays on its line and bookmarks follow their lines.
 - With unsaved changes, nothing is replaced: Code Compass tells you, and NVDA+shift+K then R reloads the file when you choose to. It asks first, and control+Z undoes the reload.
 - NVDA+shift+K then R also reloads at any time. Saving in Notepad does not count as a change.
 - Notepad++ watches its files itself (File, Reload from Disk), so Code Compass leaves it to Notepad++.
diff --git a/samples/latihan.py b/samples/latihan.py
index 288db0d..b02738a 100644
--- a/samples/latihan.py
+++ b/samples/latihan.py
@@ -1,4 +1,5 @@
 # Latihan Code Compass. Buka di Notepad, lalu coba hal-hal di bawah ini.
+# (Versi bahasa Inggris: practice.py.)
 #
 # Ctrl+Shift+Space (petunjuk parameter): taruh kursor di dalam kurung
 #   pemanggilan fungsi, misalnya di "15000" atau "diskon=10" pada baris
diff --git a/samples/practice.py b/samples/practice.py
new file mode 100644
index 0000000..0bc7b94
--- /dev/null
+++ b/samples/practice.py
@@ -0,0 +1,112 @@
+# Code Compass practice file. Open it in Notepad and try the things below.
+# (Indonesian version: latihan.py.)
+#
+# control+shift+space (parameter hint): put the caret on a call, for
+#   example on "calculate_total" or inside its parentheses in main, and
+#   press control+shift+space. Code Compass reads the parameters and
+#   which argument you are on. Try Shop("Corner Shop", ...) and
+#   shop.add_item(...) too.
+# control+space: type "calc" on an empty line, then press control+space
+#   a few times.
+# F12: with the caret on a called name such as "calculate_total", jump to
+#   where it is declared. control+alt+backspace takes you back.
+# shift+F12: a list of every line that uses that name.
+# F2: rename a name, for example "price" in calculate_total.
+# alt+page down and alt+page up: move by function. alt+left arrow: to the
+#   function or class around it.
+# control+shift+O: the outline. NVDA+shift+K, then F: the family of the
+#   function at the caret.
+# control+alt+K: set a bookmark. control+alt+L and control+alt+J: jump
+#   between bookmarks.
+# NVDA+shift+K, then shift+T: the to-do and fixme notes in comments.
+# control+F5: run this file. control+S: save and check for problems.
+# Want to hear the error sound? Delete any ")" and wait a second.
+
+
+def calculate_total(price, quantity, discount=0):
+    """Total price after a discount, in percent."""
+    gross = price * quantity
+    reduction = gross * discount / 100
+    return gross - reduction
+
+
+def format_money(amount, with_symbol=True):
+    """An amount as money text, for example 1234.5 -> "$1,234.50"."""
+    text = f"{amount:,.2f}"
+    return f"${text}" if with_symbol else text
+
+
+class Item:
+    def __init__(self, name, price, stock=1):
+        self.name = name
+        self.price = price
+        self.stock = stock
+
+    def in_stock(self):
+        return self.stock > 0
+
+
+class Shop:
+    """A small shop with a list of items."""
+
+    def __init__(self, name, city, owner="Rafli"):
+        self.name = name
+        self.city = city
+        self.owner = owner
+        self.items = []
+
+    def add_item(self, name, price, stock=1):
+        item = Item(name, price, stock)
+        self.items.append(item)
+        return item
+
+    def find(self, word, in_stock_only=False):
+        found = []
+        for item in self.items:
+            if word.lower() in item.name.lower():
+                if in_stock_only and not item.in_stock():
+                    continue
+                found.append(item)
+        return found
+
+    def report(self):
+        # TODO: sort the items from the most expensive
+        lines = [f"{self.name} in {self.city}, owned by {self.owner}"]
+        for number, item in enumerate(self.items, start=1):
+            status = "in stock" if item.in_stock() else "sold out"
+            lines.append(f"  {number}. {item.name}: {format_money(item.price)} ({status})")
+        return "\n".join(lines)
+
+
+def split_evenly(total, people):
+    """Split a total between people; people must not be zero."""
+    try:
+        return total / people
+    except ZeroDivisionError:
+        # FIXME: tell the user with a clearer message
+        return 0
+
+
+def main():
+    shop = Shop("Corner Shop", "Bandung", owner="Rafli")
+    shop.add_item("Arabica Coffee", 12.5, stock=3)
+    shop.add_item("Jasmine Tea", 4.75, stock=5)
+    shop.add_item("Palm Sugar", 3.2, stock=0)
+
+    print(shop.report())
+    print()
+
+    total = calculate_total(15, 3, discount=10)
+    print("Total:", format_money(total))
+    print("Each:", format_money(split_evenly(total, 2)))
+
+    for item in shop.find("tea", in_stock_only=True):
+        print("Found:", item.name)
+
+    # Remove the # on the line below to try an error when running
+    # (control+F5), then press F8 to go to its line.
+    # print(calculate_total(10, "two"))
+
+
+if __name__ == "__main__":
+    main()