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Author vstinner
Recipients ncoghlan, r.david.murray, vstinner, yselivanov
Date 2019-06-14.11:13:32
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
The site module tries to compute the absolute path of __file__ and __cached__ attributes of all modules in sys.modules:

def abs_paths():
    """Set all module __file__ and __cached__ attributes to an absolute path"""
    for m in set(sys.modules.values()):
        if (getattr(getattr(m, '__loader__', None), '__module__', None) not in
                ('_frozen_importlib', '_frozen_importlib_external')):
            continue   # don't mess with a PEP 302-supplied __file__
            m.__file__ = os.path.abspath(m.__file__)
        except (AttributeError, OSError, TypeError):
            m.__cached__ = os.path.abspath(m.__cached__)
        except (AttributeError, OSError, TypeError):

The __path__ attribute isn't updated.

Another approach would be to hack importlib to compute the absolute path before loading a module, rather than trying to fix it *afterwards*.

One pratical problem: posixpath and ntpath are not available when importlib is setup, these modules are implemented in pure Python and so must be imported.

Maybe importlib could use a naive implementation of os.path.abspath(). Maybe the C function _Py_abspath() that I implemented in PR 14053 should be exposed somehow to importlib as a private function using a builtin module like _imp, so it can be used directly.
Date User Action Args
2019-06-14 11:13:33vstinnersetrecipients: + vstinner, ncoghlan, r.david.murray, yselivanov
2019-06-14 11:13:33vstinnersetmessageid: <>
2019-06-14 11:13:33vstinnerlinkissue20443 messages
2019-06-14 11:13:32vstinnercreate