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cpython/Misc
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Petr Viktorin 8d239bfdcc
[3.9] bpo-45703: Invalidate _NamespacePath cache on importlib.invalidate_cache (GH-29384) (GH-30922) (GH-31076) 
Consider the following directory structure:

    .
    └── PATH1
        └── namespace
            └── sub1
                └── __init__.py

And both PATH1 and PATH2 in sys path:

    $ PYTHONPATH=PATH1:PATH2 python3.11
    >>> import namespace
    >>> import namespace.sub1
    >>> namespace.__path__
    _NamespacePath(['.../PATH1/namespace'])
    >>> ...

While this interpreter still runs, PATH2/namespace/sub2 is created:

    .
    ├── PATH1
    │   └── namespace
    │       └── sub1
    │           └── __init__.py
    └── PATH2
        └── namespace
            └── sub2
                └── __init__.py

The newly created module cannot be imported:

    >>> ...
    >>> namespace.__path__
    _NamespacePath(['.../PATH1/namespace'])
    >>> import namespace.sub2
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    ModuleNotFoundError: No module named 'namespace.sub2'

Calling importlib.invalidate_caches() now newly allows to import it:

    >>> import importlib
    >>> importlib.invalidate_caches()
    >>> namespace.__path__
    _NamespacePath(['.../PATH1/namespace'])
    >>> import namespace.sub2
    >>> namespace.__path__
    _NamespacePath(['.../PATH1/namespace', '.../PATH2/namespace'])

This was not previously possible.








Co-Authored-By: Miro Hrončok <miro@hroncok.cz>

Automerge-Triggered-By: GH:encukou
2022-02-02 05:50:43 -08:00
..
NEWS.d [3.9] bpo-45703: Invalidate _NamespacePath cache on importlib.invalidate_cache (GH-29384) (GH-30922) (GH-31076) 2022-02-02 05:50:43 -08:00
ACKS bpo-46434: Handle missing docstrings in pdb help (GH-30705) 2022-01-21 09:33:25 -08:00
coverity_model.c
gdbinit gdbinit: Use proper define syntax (GH-19557) 2020-04-23 05:49:26 -07:00
HISTORY
indent.pro
Porting
python-config.in
python-config.sh.in
python-embed.pc.in
python-wing3.wpr
python-wing4.wpr
python-wing5.wpr
python.man bpo-41525: Make the Python program help ASCII-only (GH-21836) 2020-09-08 17:47:53 -07:00
python.pc.in
README
README.AIX
README.coverity
README.valgrind closes docs: remove references to Py_USING_MEMORY_DEBUGGER (GH-30284) 2021-12-29 14:47:37 -08:00
requirements-test.txt bpo-40503: PEP 615: Tests and implementation for zoneinfo (GH-19909) 2020-05-16 10:20:06 +02:00
SpecialBuilds.txt bpo-39489: Remove COUNT_ALLOCS special build (GH-18259) 2020-02-03 15:17:15 +01:00
svnmap.txt
valgrind-python.supp bpo-35561: Supress valgrind false alarm on epoll_ctl(event) (GH-18060) 2020-01-19 23:38:37 +01:00
vgrindefs

README 

Python Misc subdirectory
========================

This directory contains files that wouldn't fit in elsewhere.  Some
documents are only of historic importance.

Files found here
----------------

ACKS                    Acknowledgements
gdbinit                 Handy stuff to put in your .gdbinit file, if you use gdb
HISTORY                 News from previous releases -- oldest last
indent.pro              GNU indent profile approximating my C style
NEWS                    News for this release (for some meaning of "this")
Porting                 Mini-FAQ on porting to new platforms
python-config.in        Python script template for python-config
python.man              UNIX man page for the python interpreter
python.pc.in            Package configuration info template for pkg-config
python-wing*.wpr        Wing IDE project file
README                  The file you're reading now
README.AIX              Information about using Python on AIX
README.coverity         Information about running Coverity's Prevent on Python
README.valgrind         Information for Valgrind users, see valgrind-python.supp
SpecialBuilds.txt       Describes extra symbols you can set for debug builds
svnmap.txt              Map of old SVN revs and branches to hg changeset ids,
                        help history-digging
valgrind-python.supp    Valgrind suppression file, see README.valgrind
vgrindefs               Python configuration for vgrind (a generic pretty printer)