python · Marius-Juston · Apr 4, 2025 · Apr 4, 2025 · Apr 4, 2025 · Apr 4, 2025
diff --git a/Lib/_pydecimal.py b/Lib/_pydecimal.py
@@ -6076,8 +6076,29 @@ def _convert_for_comparison(self, other, equality_op=False):
    \Z
 """, re.VERBOSE | re.IGNORECASE).match

-_all_zeros = re.compile('0*$').match
-_exact_half = re.compile('50*$').match
+# Checks for regex 0*$
+def _all_zeros(d_int, prec=0):
+    i = prec
+    len_d = len(d_int)
+
+    while i < len_d:
+        if d_int[i] != '0':
+            return False
+        i += 1
+    return True
+
+# Checks for regex 50*$ 
+def _exact_half(d_int, prec=0):
+    len_d = len(d_int)
+    i = prec + 1
+
+    if len_d >= i and d_int[prec] == '5':
+        while i < len_d:
+            if d_int[i] != '0':
+                return False
+            i += 1
+        return True
+    return False

 ##### PEP3101 support functions ##############################################
 # The functions in this section have little to do with the Decimal

diff --git a/Misc/NEWS.d/next/Library/2025-04-04-04-07-16.gh-issue-130167.XigAlq.rst b/Misc/NEWS.d/next/Library/2025-04-04-04-07-16.gh-issue-130167.XigAlq.rst
@@ -0,0 +1,2 @@
+Improved performance of :func:`_pydecimal._all_zeros` by an average of
+~1.7x and :func:`_pydecimal._exact_half` by ~1.38x. Patch by Marius Juston
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Improved performance of :func:`_pydecimal._all_zeros` by an average of
		~1.7x and :func:`_pydecimal._exact_half` by ~1.38x. Patch by Marius Juston