1 files changed, 7 insertions, 0 deletions
diff --git a/Lib/importlib/util.py b/Lib/importlib/util.py
index 41c74d4cc6..9d0a90d297 100644
--- a/Lib/importlib/util.py
+++ b/Lib/importlib/util.py
@@ -5,18 +5,25 @@ from ._bootstrap import _resolve_name
 from ._bootstrap import spec_from_loader
 from ._bootstrap import _find_spec
 from ._bootstrap_external import MAGIC_NUMBER
+from ._bootstrap_external import _RAW_MAGIC_NUMBER
 from ._bootstrap_external import cache_from_source
 from ._bootstrap_external import decode_source
 from ._bootstrap_external import source_from_cache
 from ._bootstrap_external import spec_from_file_location
 
 from contextlib import contextmanager
+import _imp
 import functools
 import sys
 import types
 import warnings
 
 
+def source_hash(source_bytes):
+    "Return the hash of *source_bytes* as used in hash-based pyc files."
+    return _imp.source_hash(_RAW_MAGIC_NUMBER, source_bytes)
+
+
 def resolve_name(name, package):
     """Resolve a relative module name to an absolute one."""
     if not name.startswith('.'):