python · Fidget-Spinner · Jan 4, 2026 · Jan 3, 2026 · Jan 4, 2026 · Jan 4, 2026
diff --git a/Include/internal/pycore_magic_number.h b/Include/internal/pycore_magic_number.h
@@ -286,7 +286,8 @@ Known values:
    Python 3.15a1 3653 (Fix handling of opcodes that may leave operands on the stack when optimizing LOAD_FAST)
    Python 3.15a1 3654 (Fix missing exception handlers in logical expression)
    Python 3.15a1 3655 (Fix miscompilation of some module-level annotations)
-    Python 3.15a1 3656 (Add TRACE_RECORD instruction, for platforms with switch based interpreter)
+    Python 3.15a2 3656 (Add TRACE_RECORD instruction, for platforms with switch based interpreter)
+    Python 3.15a4 3657 (Add BINARY_OP_SUBSCR_USTR_INT)


    Python 3.16 will start with 3700
@@ -300,7 +301,7 @@ PC/launcher.c must also be updated.

 */

-#define PYC_MAGIC_NUMBER 3656
+#define PYC_MAGIC_NUMBER 3657
 /* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
   (little-endian) and then appending b'\r\n'. */
 #define PYC_MAGIC_NUMBER_TOKEN \

diff --git a/Include/internal/pycore_opcode_metadata.h b/Include/internal/pycore_opcode_metadata.h