From 17a5522503ec7ff0f7d0d6cc07296706ae44e97e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=87=91=E8=B1=86?= <jindou@jindoudeMacBook-Air.local>
Date: Mon, 5 Oct 2026 21:32:19 +0800
Subject: [PATCH] ordinal: fix suffix for negative numbers

The suffix tables are indexed with value % 10 (and the 11/12/13
special case with value % 100), but Python's modulo maps negative
numbers outside those ranges: -1 % 10 == 9, so every negative number
got the generic 'th' suffix:

    >>> ordinal(-1)
    '-1th'
    >>> ordinal(-101)
    '-101th'

Select the suffix on the absolute value so negative ordinals get the
same suffix as their positive counterparts ('-1st', '-101st').
---
 src/humanize/number.py | 7 +++++--
 tests/test_number.py   | 7 +++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/humanize/number.py b/src/humanize/number.py
index 6611a21..a112065 100644
--- a/src/humanize/number.py
+++ b/src/humanize/number.py
@@ -79,9 +79,12 @@ def ordinal(value, gender="male"):
             P_("8 (female)", "th"),
             P_("9 (female)", "th"),
         )
-    if value % 100 in (11, 12, 13):  # special case
+    # Python's modulo keeps negative numbers out of the 0-9/11-13 ranges the
+    # suffix tables are indexed with, so select on the absolute value
+    n = abs(value)
+    if n % 100 in (11, 12, 13):  # special case
         return f"{value}{t[0]}"
-    return f"{value}{t[value % 10]}"
+    return f"{value}{t[n % 10]}"
 
 
 def intcomma(value, ndigits=None):
diff --git a/tests/test_number.py b/tests/test_number.py
index eec6217..54cdbf7 100644
--- a/tests/test_number.py
+++ b/tests/test_number.py
@@ -20,6 +20,13 @@
         ("102", "102nd"),
         ("103", "103rd"),
         ("111", "111th"),
+        ("-1", "-1st"),
+        ("-2", "-2nd"),
+        ("-3", "-3rd"),
+        ("-4", "-4th"),
+        ("-11", "-11th"),
+        ("-111", "-111th"),
+        ("-101", "-101st"),
         ("something else", "something else"),
         (None, None),
     ],