Doc/c-api/reflection.rst - main - githubmirror/cpython

Doc/c-api/reflection.rst
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Peter Bierma
gh-127989: C API: Refer to "attached thread states" instead of the GIL (GH-127990)
20 мар 2025, 15:06
20 мар 2025, 15:0686d5fa9
.. highlight:: c

.. _reflection:

Reflection
==========

.. c:function:: PyObject* PyEval_GetBuiltins(void)

   .. deprecated:: 3.13

      Use :c:func:`PyEval_GetFrameBuiltins` instead.

   Return a dictionary of the builtins in the current execution frame,
   or the interpreter of the thread state if no frame is currently executing.


.. c:function:: PyObject* PyEval_GetLocals(void)

   .. deprecated:: 3.13

      Use either :c:func:`PyEval_GetFrameLocals` to obtain the same behaviour as calling
      :func:`locals` in Python code, or else call :c:func:`PyFrame_GetLocals` on the result
      of :c:func:`PyEval_GetFrame` to access the :attr:`~frame.f_locals` attribute of the
      currently executing frame.

   Return a mapping providing access to the local variables in the current execution frame,
   or ``NULL`` if no frame is currently executing.

   Refer to :func:`locals` for details of the mapping returned at different scopes.

   As this function returns a :term:`borrowed reference`, the dictionary returned for
   :term:`optimized scopes <optimized scope>` is cached on the frame object and will remain
   alive as long as the frame object does. Unlike :c:func:`PyEval_GetFrameLocals` and
   :func:`locals`, subsequent calls to this function in the same frame will update the
   contents of the cached dictionary to reflect changes in the state of the local variables
   rather than returning a new snapshot.

   .. versionchanged:: 3.13
      As part of :pep:`667`, :c:func:`PyFrame_GetLocals`, :func:`locals`, and
      :attr:`FrameType.f_locals <frame.f_locals>` no longer make use of the shared cache
      dictionary. Refer to the :ref:`What's New entry <whatsnew313-locals-semantics>` for
      additional details.


.. c:function:: PyObject* PyEval_GetGlobals(void)

   .. deprecated:: 3.13

      Use :c:func:`PyEval_GetFrameGlobals` instead.

   Return a dictionary of the global variables in the current execution frame,
   or ``NULL`` if no frame is currently executing.


.. c:function:: PyFrameObject* PyEval_GetFrame(void)

   Return the :term:`attached thread state`'s frame, which is ``NULL`` if no frame is
   currently executing.

   See also :c:func:`PyThreadState_GetFrame`.


.. c:function:: PyObject* PyEval_GetFrameBuiltins(void)

   Return a dictionary of the builtins in the current execution frame,
   or the interpreter of the thread state if no frame is currently executing.

   .. versionadded:: 3.13


.. c:function:: PyObject* PyEval_GetFrameLocals(void)

   Return a dictionary of the local variables in the current execution frame,
   or ``NULL`` if no frame is currently executing. Equivalent to calling
   :func:`locals` in Python code.

   To access :attr:`~frame.f_locals` on the current frame without making an independent
   snapshot in :term:`optimized scopes <optimized scope>`, call :c:func:`PyFrame_GetLocals`
   on the result of :c:func:`PyEval_GetFrame`.

   .. versionadded:: 3.13


.. c:function:: PyObject* PyEval_GetFrameGlobals(void)

   Return a dictionary of the global variables in the current execution frame,
   or ``NULL`` if no frame is currently executing. Equivalent to calling
   :func:`globals` in Python code.

   .. versionadded:: 3.13


.. c:function:: const char* PyEval_GetFuncName(PyObject *func)

   Return the name of *func* if it is a function, class or instance object, else the
   name of *func*\s type.


.. c:function:: const char* PyEval_GetFuncDesc(PyObject *func)

   Return a description string, depending on the type of *func*.
   Return values include "()" for functions and methods, " constructor",
   " instance", and " object".  Concatenated with the result of
   :c:func:`PyEval_GetFuncName`, the result will be a description of
   *func*.