Add line-up exercise

Author: BNAndras

config.json

@@ -511,6 +511,14 @@
         ],
         "difficulty": 1
       },
+      {
+        "slug": "line-up",
+        "name": "Line Up",
+        "uuid": "e09d877e-489b-4dbd-89c5-f6b15e867b67",
+        "practices": ["string-formatting"],
+        "prerequisites": ["basics", "strings"],
+        "difficulty": 1
+      },
       {
         "slug": "difference-of-squares",
         "name": "Difference of Squares",

exercises/practice/line-up/.docs/instructions.md

@@ -0,0 +1,19 @@
+# Instructions
+
+Given a name and a number, your task is to produce a sentence using that name and that number as an [ordinal numeral][ordinal-numeral].
+Yaʻqūb expects to use numbers from 1 up to 999.
+
+Rules:
+
+- Numbers ending in 1 (unless ending in 11) → `"st"`
+- Numbers ending in 2 (unless ending in 12) → `"nd"`
+- Numbers ending in 3 (unless ending in 13) → `"rd"`
+- All other numbers → `"th"`
+
+Examples:
+
+- `"Mary", 1` → `"Mary, you are the 1st customer we serve today. Thank you!"`
+- `"John", 12` → `"John, you are the 12th customer we serve today. Thank you!"`
+- `"Dahir", 162` → `"Dahir, you are the 162nd customer we serve today. Thank you!"`
+
+[ordinal-numeral]: https://en.wikipedia.org/wiki/Ordinal_numeral

exercises/practice/line-up/.docs/introduction.md

@@ -0,0 +1,7 @@
+# Introduction
+
+Your friend Yaʻqūb works the counter at a deli in town, slicing, weighing, and wrapping orders for a line of hungry customers that gets longer every day.
+Waiting customers are starting to lose track of who is next, so he wants numbered tickets they can use to track the order in which they arrive.
+
+To make the customers feel special, he does not want the ticket to have only a number on it.
+They shall get a proper English sentence with their name and number on it.

exercises/practice/line-up/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "line_up.py"
+    ],
+    "test": [
+      "line_up_test.py"
+    ],
+    "example": [
+      ".meta/example.py"
+    ]
+  },
+  "blurb": "Help lining up customers at Yaʻqūb's Deli.",
+  "source": "mk-mxp, based on previous work from Exercism contributors codedge and neenjaw",
+  "source_url": "https://forum.exercism.org/t/new-exercise-ordinal-numbers/19147"
+}

exercises/practice/line-up/.meta/example.py

@@ -0,0 +1,19 @@
+def line_up(name, number):
+    suffix = get_suffix(number)
+    return f"{name}, you are the {number}{suffix} customer we serve today. Thank you!"
+
+
+def get_suffix(number):
+    if 11 <= number % 100 <= 13:
+        return "th"
+
+    mod_10 = number % 10
+
+    if mod_10 == 1:
+        return "st"
+    if mod_10 == 2:
+        return "nd"
+    if mod_10 == 3:
+        return "rd"
+
+    return "th"

exercises/practice/line-up/.meta/template.j2

@@ -0,0 +1,10 @@
+{%- import "generator_macros.j2" as macros with context -%}
+{{ macros.canonical_ref() }}
+
+{{ macros.header(imports=['line_up']) }}
+
+class {{ exercise | camel_case }}Test(unittest.TestCase):
+    {% for case in cases -%}
+    def test_{{ case["description"] | to_snake }}(self):
+        self.assertEqual(line_up("{{ case["input"]["name"] }}", {{ case["input"]["number"] }}), "{{ case["expected"] }}")
+    {% endfor -%}

exercises/practice/line-up/.meta/tests.toml

@@ -0,0 +1,67 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[7760d1b8-4864-4db4-953b-0fa7c047dbc0]
+description = "format smallest non-exceptional ordinal numeral 4"
+
+[e8b7c715-6baa-4f7b-8fb3-2fa48044ab7a]
+description = "format greatest single digit non-exceptional ordinal numeral 9"
+
+[f370aae9-7ae7-4247-90ce-e8ff8c6934df]
+description = "format non-exceptional ordinal numeral 5"
+
+[37f10dea-42a2-49de-bb92-0b690b677908]
+description = "format non-exceptional ordinal numeral 6"
+
+[d8dfb9a2-3a1f-4fee-9dae-01af3600054e]
+description = "format non-exceptional ordinal numeral 7"
+
+[505ec372-1803-42b1-9377-6934890fd055]
+description = "format non-exceptional ordinal numeral 8"
+
+[8267072d-be1f-4f70-b34a-76b7557a47b9]
+description = "format exceptional ordinal numeral 1"
+
+[4d8753cb-0364-4b29-84b8-4374a4fa2e3f]
+description = "format exceptional ordinal numeral 2"
+
+[8d44c223-3a7e-4f48-a0ca-78e67bf98aa7]
+description = "format exceptional ordinal numeral 3"
+
+[6c4f6c88-b306-4f40-bc78-97cdd583c21a]
+description = "format smallest two digit non-exceptional ordinal numeral 10"
+
+[e257a43f-d2b1-457a-97df-25f0923fc62a]
+description = "format non-exceptional ordinal numeral 11"
+
+[bb1db695-4d64-457f-81b8-4f5a2107e3f4]
+description = "format non-exceptional ordinal numeral 12"
+
+[60a3187c-9403-4835-97de-4f10ebfd63e2]
+description = "format non-exceptional ordinal numeral 13"
+
+[2bdcebc5-c029-4874-b6cc-e9bec80d603a]
+description = "format exceptional ordinal numeral 21"
+
+[74ee2317-0295-49d2-baf0-d56bcefa14e3]
+description = "format exceptional ordinal numeral 62"
+
+[b37c332d-7f68-40e3-8503-e43cbd67a0c4]
+description = "format exceptional ordinal numeral 100"
+
+[0375f250-ce92-4195-9555-00e28ccc4d99]
+description = "format exceptional ordinal numeral 101"
+
+[0d8a4974-9a8a-45a4-aca7-a9fb473c9836]
+description = "format non-exceptional ordinal numeral 112"
+
+[06b62efe-199e-4ce7-970d-4bf73945713f]
+description = "format exceptional ordinal numeral 123"

exercises/practice/line-up/line_up.py

@@ -0,0 +1,2 @@
+def line_up(name, number):
+    pass

exercises/practice/line-up/line_up_test.py

@@ -0,0 +1,125 @@
+# These tests are auto-generated with test data from:
+# https://github.com/exercism/problem-specifications/tree/main/exercises/line-up/canonical-data.json
+# File last updated on 2026-01-23
+
+import unittest
+
+from line_up import (
+    line_up,
+)
+
+
+class LineUpTest(unittest.TestCase):
+    def test_format_smallest_non_exceptional_ordinal_numeral_4(self):
+        self.assertEqual(
+            line_up("Gianna", 4),
+            "Gianna, you are the 4th customer we serve today. Thank you!",
+        )
+
+    def test_format_greatest_single_digit_non_exceptional_ordinal_numeral_9(self):
+        self.assertEqual(
+            line_up("Maarten", 9),
+            "Maarten, you are the 9th customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_5(self):
+        self.assertEqual(
+            line_up("Petronila", 5),
+            "Petronila, you are the 5th customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_6(self):
+        self.assertEqual(
+            line_up("Attakullakulla", 6),
+            "Attakullakulla, you are the 6th customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_7(self):
+        self.assertEqual(
+            line_up("Kate", 7),
+            "Kate, you are the 7th customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_8(self):
+        self.assertEqual(
+            line_up("Maximiliano", 8),
+            "Maximiliano, you are the 8th customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_1(self):
+        self.assertEqual(
+            line_up("Mary", 1),
+            "Mary, you are the 1st customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_2(self):
+        self.assertEqual(
+            line_up("Haruto", 2),
+            "Haruto, you are the 2nd customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_3(self):
+        self.assertEqual(
+            line_up("Henriette", 3),
+            "Henriette, you are the 3rd customer we serve today. Thank you!",
+        )
+
+    def test_format_smallest_two_digit_non_exceptional_ordinal_numeral_10(self):
+        self.assertEqual(
+            line_up("Alvarez", 10),
+            "Alvarez, you are the 10th customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_11(self):
+        self.assertEqual(
+            line_up("Jacqueline", 11),
+            "Jacqueline, you are the 11th customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_12(self):
+        self.assertEqual(
+            line_up("Juan", 12),
+            "Juan, you are the 12th customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_13(self):
+        self.assertEqual(
+            line_up("Patricia", 13),
+            "Patricia, you are the 13th customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_21(self):
+        self.assertEqual(
+            line_up("Washi", 21),
+            "Washi, you are the 21st customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_62(self):
+        self.assertEqual(
+            line_up("Nayra", 62),
+            "Nayra, you are the 62nd customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_100(self):
+        self.assertEqual(
+            line_up("John", 100),
+            "John, you are the 100th customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_101(self):
+        self.assertEqual(
+            line_up("Zeinab", 101),
+            "Zeinab, you are the 101st customer we serve today. Thank you!",
+        )
+
+    def test_format_non_exceptional_ordinal_numeral_112(self):
+        self.assertEqual(
+            line_up("Knud", 112),
+            "Knud, you are the 112th customer we serve today. Thank you!",
+        )
+
+    def test_format_exceptional_ordinal_numeral_123(self):
+        self.assertEqual(
+            line_up("Yma", 123),
+            "Yma, you are the 123rd customer we serve today. Thank you!",
+        )