diff options
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/imp.rst | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/Doc/library/imp.rst b/Doc/library/imp.rst index 3e79936..43d740b 100644 --- a/Doc/library/imp.rst +++ b/Doc/library/imp.rst @@ -180,14 +180,19 @@ file paths. source *path*. For example, if *path* is ``/foo/bar/baz.py`` the return value would be ``/foo/bar/__pycache__/baz.cpython-32.pyc`` for Python 3.2. The ``cpython-32`` string comes from the current magic tag (see - :func:`get_tag`). The returned path will end in ``.pyc`` when - ``__debug__`` is True or ``.pyo`` for an optimized Python + :func:`get_tag`; if :attr:`sys.implementation.cache_tag` is not defined then + :exc:`NotImplementedError` will be raised). The returned path will end in + ``.pyc`` when ``__debug__`` is True or ``.pyo`` for an optimized Python (i.e. ``__debug__`` is False). By passing in True or False for *debug_override* you can override the system's value for ``__debug__`` for extension selection. *path* need not exist. + .. versionchanged:: 3.3 + If :attr:`sys.implementation.cache_tag` is ``None``, then + :exc:`NotImplementedError` is raised. + .. function:: source_from_cache(path) @@ -195,7 +200,13 @@ file paths. file path. For example, if *path* is ``/foo/bar/__pycache__/baz.cpython-32.pyc`` the returned path would be ``/foo/bar/baz.py``. *path* need not exist, however if it does not conform - to :pep:`3147` format, a ``ValueError`` is raised. + to :pep:`3147` format, a ``ValueError`` is raised. If + :attr:`sys.implementation.cache_tag` is not defined, + :exc:`NotImplementedError` is raised. + + .. versionchanged:: 3.3 + Raise :exc:`NotImplementedError` when + :attr:`sys.implementation.cache_tag` is not defined. .. function:: get_tag() @@ -203,6 +214,10 @@ file paths. Return the :pep:`3147` magic tag string matching this version of Python's magic number, as returned by :func:`get_magic`. + .. note:: + You may use :attr:`sys.implementation.cache_tag` directly starting + in Python 3.3. + The following functions help interact with the import system's internal locking mechanism. Locking semantics of imports are an implementation |