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.
Use Unicode for module name and paths in the following functions:
* PyImport_ImportModuleLevel()
* add_submodule()
* ensure_from_list()
* get_parent()
* import_module_level()
* import_submodule()
* load_next()
* mark_miss()
* Use Unicode for module name and path in the following functions:
* get_file()
* load_source_module(), parse_source_module()
* make_compiled_pathname(), check_compiled_module(),
read_compiled_module(), load_compiled_module(), write_compiled_module(),
update_compiled_module()
* On Windows, use CreateDirectoryW() instead of mkdir()
* update_compiled_module() cannot fail anymore
