Make importlib compatible with __import__ by "fixing" code.co_filename
paths.
__import__ does a little trick when importing from bytecode by
back-patching the co_filename paths to point to the file location
where the code object was loaded from, *not* where the code object was
originally created. This allows co_filename to point to a valid path.
Problem is that co_filename is immutable from Python, so a private
function -- imp._fix_co_filename() -- had to be introduced in order to
get things working properly. Originally the plan was to add a file
argument to marshal.loads(), but that failed as the algorithm used by
__import__ is not fully recursive as one might expect, so to be fully
backwards-compatible the code used by __import__ needed to be exposed.
This closes issue #6811 by taking a different approach than outlined
in the issue.
diff --git a/Misc/NEWS b/Misc/NEWS
index 0dd8a3d..f70998c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -84,6 +84,10 @@
Library
-------
+- Issue #6811: Allow importlib to change a code object's co_filename attribute
+ to match the path to where the source code currently is, not where the code
+ object originally came from.
+
- Issue #8754: Have importlib use the repr of a module name in error messages.
- Issue #11591: Prevent "import site" from modifying sys.path when python