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Diffstat (limited to 'Doc/whatsnew/3.5.rst')
| -rw-r--r-- | Doc/whatsnew/3.5.rst | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/Doc/whatsnew/3.5.rst b/Doc/whatsnew/3.5.rst index 28914ef..5c21054 100644 --- a/Doc/whatsnew/3.5.rst +++ b/Doc/whatsnew/3.5.rst @@ -88,6 +88,8 @@ Implementation improvements: ``surrogateescape`` error handler, instead of the ``strict`` error handler (:issue:`19977`). +* :pep:`488`, the elimination of ``.pyo`` files. + Significantly Improved Library Modules: * None yet. @@ -195,6 +197,24 @@ environment will be used. :pep:`486` -- Make the Python Launcher aware of virtual environments + +PEP 488: Elimination of PYO files +--------------------------------- + +:pep:`488` does away with the concept of ``.pyo`` files. This means that +``.pyc`` files represent both unoptimized and optimized bytecode. To prevent +the need to constantly regenerate bytecode files, ``.pyc`` files now have an +optional ``opt-`` tag in their name when the bytecode is optimized. This has +the side-effect of no more bytecode file name clashes when running under either +``-O`` or ``-OO``, thus allowing unoptimized, ``-O``, and ``-OO`` bytecode files +to all exist simultaneously. :func:`importlib.util.cache_from_source` has an +updated API to help with this change. + +.. seealso:: + + :pep:`488` -- Elimination of PYO files + + Other Language Changes ====================== @@ -535,7 +555,7 @@ The following performance enhancements have been added: ``FindFirstFile``/``FindNextFile`` system calls. (Contributed by Ben Hoyt with help from Victor Stinner in :issue:`23605`.) -* Construction of ``bytes(int)`` (filled by zero bytes) is faster and use less +* Construction of ``bytes(int)`` (filled by zero bytes) is faster and uses less memory for large objects. ``calloc()`` is used instead of ``malloc()`` to allocate memory for these objects. @@ -630,6 +650,8 @@ removed: 3.4, and has now been removed. (Contributed by Matt Chaput in :issue:`6623`.) +* The concept of ``.pyo`` files has been removed. + * The JoinableQueue class in the provisional asyncio module was deprecated in 3.4.4 and is now removed (:issue:`23464`). @@ -759,6 +781,17 @@ Changes in the Python API *LegalChars* parameter of :func:`~http.cookies.Morsel.set` is deprecated and is now ignored. (:issue:`2211`) +* :pep:`488` has removed ``.pyo`` files from Python and introduced the optional + ``opt-`` tag in ``.pyc`` file names. The + :func:`importlib.util.cache_from_source` has gained an *optimization* + parameter to help control the ``opt-`` tag. Because of this, the + *debug_override* parameter of the function is now deprecated. `.pyo` files + are also no longer supported as a file argument to the Python interpreter and + thus serve no purpose when distributed on their own (i.e. sourcless code + distribution). Due to the fact that the magic number for bytecode has changed + in Python 3.5, all old `.pyo` files from previous versions of Python are + invalid regardless of this PEP. + Changes in the C API -------------------- |