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Issue #15056: imp.cache_from_source() and source_from_cache() raise

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NotimplementedError when sys.implementation.cache_tag is None.

Thanks to Pranav Ravichandran for taking an initial stab at the patch.
This commit is contained in:
Brett Cannon 2012-07-09 13:58:07 -04:00
parent bf7eab077f
commit 19a2f5961c
6 changed files with 3875 additions and 3802 deletions
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21
Doc/library/imp.rst
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@ -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