Issue #13959: Keep imp.get_magic() in C code, but cache in importlib
for performance. While get_magic() could move to Lib/imp.py, having to
support PyImport_GetMagicNumber() would lead to equal, if not more, C
code than sticking with the status quo.
diff --git a/Lib/imp.py b/Lib/imp.py
index 6a86ba9..03b832e 100644
--- a/Lib/imp.py
+++ b/Lib/imp.py
@@ -11,8 +11,10 @@
init_builtin, init_frozen, is_builtin, is_frozen,
_fix_co_filename)
# Can (probably) move to importlib
-from _imp import (get_magic, get_tag, get_suffixes, cache_from_source,
+from _imp import (get_tag, get_suffixes, cache_from_source,
source_from_cache)
+# Could move out of _imp, but not worth the code
+from _imp import get_magic
# Should be re-implemented here (and mostly deprecated)
from _imp import (find_module, NullImporter,
SEARCH_ERROR, PY_SOURCE, PY_COMPILED, C_EXTENSION,