python · sobolevn · Mar 24, 2025 · Mar 7, 2025 · Mar 9, 2025 · Mar 9, 2025
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
@@ -5,6 +5,7 @@
 """
 
 import array
+import operator
 import os
 import re
 import sys
@@ -751,6 +752,8 @@ def check(fmt, vals, result):
         check(b'%i%b %*.*b', (10, b'3', 5, 3, b'abc',), b'103   abc')
         check(b'%c', b'a', b'a')
 
+        self.assertRaisesRegex(TypeError, '%i format: a real number is required, not complex', operator.mod, '%i', 2j)
+
     def test_imod(self):
         b = self.type2test(b'hello, %b!')
         orig = b

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-03-09-09-03-24.gh-issue-130928.gP1yKv.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-03-09-09-03-24.gh-issue-130928.gP1yKv.rst
@@ -0,0 +1,2 @@
+Fix error message when formatting bytes using the ``'i'`` flag.
+Patch by Maxim Ageev.
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
@@ -468,8 +468,6 @@ static PyObject *
 formatlong(PyObject *v, int flags, int prec, int type)
 {
     PyObject *result, *iobj;
-    if (type == 'i')
-        type = 'd';
     if (PyLong_Check(v))
         return _PyUnicode_FormatLong(v, flags & F_ALT, prec, type);
     if (PyNumber_Check(v)) {
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Fix error message when formatting bytes using the ``'i'`` flag.
		Patch by Maxim Ageev.