python
diff --git a/‎Lib/test/test_format.py
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+2Lines changed: 2 additions & 0 deletions b/‎Lib/test/test_format.py
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diff --git a/‎Misc/NEWS.d/next/Core and Builtins/2023-05-01-12-03-52.gh-issue-104018.PFxGS4.rst
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+1Lines changed: 1 addition & 0 deletions b/‎Misc/NEWS.d/next/Core and Builtins/2023-05-01-12-03-52.gh-issue-104018.PFxGS4.rst
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diff --git a/‎Objects/bytesobject.c
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-1Lines changed: 0 additions & 1 deletion b/‎Objects/bytesobject.c
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@@ -619,6 +619,8 @@ def test_specifier_z_error(self):
         error_msg = re.escape("unsupported format character 'z'")
         with self.assertRaisesRegex(ValueError, error_msg):
             "%z.1f" % 0  # not allowed in old style string interpolation
+        with self.assertRaisesRegex(ValueError, error_msg):
+            b"%z.1f" % 0
 
 
 if __name__ == "__main__":
 
@@ -0,0 +1 @@
+Disallow the "z" format specifier in %-format of bytes objects.
@@ -714,7 +714,6 @@ _PyBytes_FormatEx(const char *format, Py_ssize_t format_len,
                 case ' ': flags |= F_BLANK; continue;
                 case '#': flags |= F_ALT; continue;
                 case '0': flags |= F_ZERO; continue;
-                case 'z': flags |= F_NO_NEG_0; continue;
                 }
                 break;
             }
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Disallow the "z" format specifier in %-format of bytes objects.`
Original file line number	Diff line number	Diff line change
`@@ -714,7 +714,6 @@ _PyBytes_FormatEx(const char *format, Py_ssize_t format_len,`
`714`	`714`	`case ' ': flags \|= F_BLANK; continue;`
`715`	`715`	`case '#': flags \|= F_ALT; continue;`
`716`	`716`	`case '0': flags \|= F_ZERO; continue;`
`717`		`- case 'z': flags \|= F_NO_NEG_0; continue;`
`718`	`717`	`}`
`719`	`718`	`break;`
`720`	`719`	`}`