mirror of https://github.com/python/cpython.git
Reorganize the PyInitConfig documentation (#129047)
Document the new PyInitConfig API before the old PyConfig API.
This commit is contained in:
Victor Stinner
GitHub
parent
9b1c1817af
commit
a429159797
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@ -6,6 +6,325 @@
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Python Initialization Configuration
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***********************************
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.. _pyinitconfig_api:
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PyInitConfig C API
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==================
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.. versionadded:: 3.14
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Python can be initialized with :c:func:`Py_InitializeFromInitConfig`.
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The :c:func:`Py_RunMain` function can be used to write a customized Python
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program.
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See also :ref:`Initialization, Finalization, and Threads <initialization>`.
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.. seealso::
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:pep:`741` "Python Configuration C API".
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Example
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-------
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Example of customized Python always running with the :ref:`Python Development
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Mode <devmode>` enabled; return ``-1`` on error:
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.. code-block:: c
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int init_python(void)
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{
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PyInitConfig *config = PyInitConfig_Create();
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if (config == NULL) {
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printf("PYTHON INIT ERROR: memory allocation failed\n");
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return -1;
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}
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// Enable the Python Development Mode
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if (PyInitConfig_SetInt(config, "dev_mode", 1) < 0) {
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goto error;
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}
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// Initialize Python with the configuration
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if (Py_InitializeFromInitConfig(config) < 0) {
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goto error;
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}
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PyInitConfig_Free(config);
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return 0;
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error:
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{
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// Display the error message.
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//
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// This uncommon braces style is used, because you cannot make
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// goto targets point to variable declarations.
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const char *err_msg;
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(void)PyInitConfig_GetError(config, &err_msg);
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printf("PYTHON INIT ERROR: %s\n", err_msg);
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PyInitConfig_Free(config);
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return -1;
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}
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}
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Create Config
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-------------
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.. c:struct:: PyInitConfig
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Opaque structure to configure the Python initialization.
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.. c:function:: PyInitConfig* PyInitConfig_Create(void)
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Create a new initialization configuration using :ref:`Isolated Configuration
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<init-isolated-conf>` default values.
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It must be freed by :c:func:`PyInitConfig_Free`.
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Return ``NULL`` on memory allocation failure.
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.. c:function:: void PyInitConfig_Free(PyInitConfig *config)
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Free memory of the initialization configuration *config*.
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If *config* is ``NULL``, no operation is performed.
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Error Handling
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--------------
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.. c:function:: int PyInitConfig_GetError(PyInitConfig* config, const char **err_msg)
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Get the *config* error message.
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* Set *\*err_msg* and return ``1`` if an error is set.
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* Set *\*err_msg* to ``NULL`` and return ``0`` otherwise.
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An error message is an UTF-8 encoded string.
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If *config* has an exit code, format the exit code as an error
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message.
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The error message remains valid until another ``PyInitConfig``
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function is called with *config*. The caller doesn't have to free the
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error message.
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.. c:function:: int PyInitConfig_GetExitCode(PyInitConfig* config, int *exitcode)
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Get the *config* exit code.
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* Set *\*exitcode* and return ``1`` if *config* has an exit code set.
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* Return ``0`` if *config* has no exit code set.
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Only the ``Py_InitializeFromInitConfig()`` function can set an exit
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code if the ``parse_argv`` option is non-zero.
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An exit code can be set when parsing the command line failed (exit
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code ``2``) or when a command line option asks to display the command
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line help (exit code ``0``).
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Get Options
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-----------
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The configuration option *name* parameter must be a non-NULL
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null-terminated UTF-8 encoded string.
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.. c:function:: int PyInitConfig_HasOption(PyInitConfig *config, const char *name)
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Test if the configuration has an option called *name*.
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Return ``1`` if the option exists, or return ``0`` otherwise.
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.. c:function:: int PyInitConfig_GetInt(PyInitConfig *config, const char *name, int64_t *value)
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Get an integer configuration option.
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* Set *\*value*, and return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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.. c:function:: int PyInitConfig_GetStr(PyInitConfig *config, const char *name, char **value)
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Get a string configuration option as a null-terminated UTF-8
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encoded string.
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* Set *\*value*, and return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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*\*value* can be set to ``NULL`` if the option is an optional string and the
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option is unset.
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On success, the string must be released with ``free(value)`` if it's not
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``NULL``.
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.. c:function:: int PyInitConfig_GetStrList(PyInitConfig *config, const char *name, size_t *length, char ***items)
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Get a string list configuration option as an array of
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null-terminated UTF-8 encoded strings.
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* Set *\*length* and *\*value*, and return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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On success, the string list must be released with
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``PyInitConfig_FreeStrList(length, items)``.
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.. c:function:: void PyInitConfig_FreeStrList(size_t length, char **items)
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Free memory of a string list created by
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``PyInitConfig_GetStrList()``.
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Set Options
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-----------
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The configuration option *name* parameter must be a non-NULL null-terminated
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UTF-8 encoded string.
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Some configuration options have side effects on other options. This logic is
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only implemented when ``Py_InitializeFromInitConfig()`` is called, not by the
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"Set" functions below. For example, setting ``dev_mode`` to ``1`` does not set
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``faulthandler`` to ``1``.
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.. c:function:: int PyInitConfig_SetInt(PyInitConfig *config, const char *name, int64_t value)
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Set an integer configuration option.
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* Return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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.. c:function:: int PyInitConfig_SetStr(PyInitConfig *config, const char *name, const char *value)
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Set a string configuration option from a null-terminated UTF-8
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encoded string. The string is copied.
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* Return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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.. c:function:: int PyInitConfig_SetStrList(PyInitConfig *config, const char *name, size_t length, char * const *items)
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Set a string list configuration option from an array of
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null-terminated UTF-8 encoded strings. The string list is copied.
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* Return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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Module
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------
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.. c:function:: int PyInitConfig_AddModule(PyInitConfig *config, const char *name, PyObject* (*initfunc)(void))
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Add a built-in extension module to the table of built-in modules.
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The new module can be imported by the name *name*, and uses the function
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*initfunc* as the initialization function called on the first attempted
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import.
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* Return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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If Python is initialized multiple times, ``PyInitConfig_AddModule()`` must
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be called at each Python initialization.
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Similar to the :c:func:`PyImport_AppendInittab` function.
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Initialize Python
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-----------------
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.. c:function:: int Py_InitializeFromInitConfig(PyInitConfig *config)
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Initialize Python from the initialization configuration.
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* Return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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* Set an exit code in *config* and return ``-1`` if Python wants to
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exit.
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See ``PyInitConfig_GetExitcode()`` for the exit code case.
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Runtime Python configuration API
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================================
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At runtime, it's possible to get and set configuration options using
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:c:func:`PyConfig_Get` and :c:func:`PyConfig_Set` functions.
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The configuration option *name* parameter must be a non-NULL null-terminated
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UTF-8 encoded string.
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Some options are read from the :mod:`sys` attributes. For example, the option
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``"argv"`` is read from :data:`sys.argv`.
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.. c:function:: PyObject* PyConfig_Get(const char *name)
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Get the current runtime value of a configuration option as a Python object.
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* Return a new reference on success.
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* Set an exception and return ``NULL`` on error.
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The object type depends on the configuration option. It can be:
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* ``bool``
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* ``int``
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* ``str``
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* ``list[str]``
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* ``dict[str, str]``
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The caller must hold the GIL. The function cannot be called before
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Python initialization nor after Python finalization.
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.. versionadded:: 3.14
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.. c:function:: int PyConfig_GetInt(const char *name, int *value)
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Similar to :c:func:`PyConfig_Get`, but get the value as a C int.
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* Return ``0`` on success.
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* Set an exception and return ``-1`` on error.
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.. versionadded:: 3.14
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.. c:function:: PyObject* PyConfig_Names(void)
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Get all configuration option names as a ``frozenset``.
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* Return a new reference on success.
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* Set an exception and return ``NULL`` on error.
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The caller must hold the GIL. The function cannot be called before
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Python initialization nor after Python finalization.
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.. versionadded:: 3.14
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.. c:function:: int PyConfig_Set(const char *name, PyObject *value)
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Set the current runtime value of a configuration option.
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* Raise a :exc:`ValueError` if there is no option *name*.
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* Raise a :exc:`ValueError` if *value* is an invalid value.
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* Raise a :exc:`ValueError` if the option is read-only (cannot be set).
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* Raise a :exc:`TypeError` if *value* has not the proper type.
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The caller must hold the GIL. The function cannot be called before
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Python initialization nor after Python finalization.
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.. versionadded:: 3.14
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.. _pyconfig_api:
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PyConfig C API
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@ -1618,324 +1937,6 @@ The ``__PYVENV_LAUNCHER__`` environment variable is used to set
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set to the ``pyvenv.cfg`` directory. This was previously done by :mod:`site`,
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therefore affected by :option:`-S`.
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.. _pyinitconfig_api:
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PyInitConfig C API
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==================
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C API to configure the Python initialization (:pep:`741`).
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.. versionadded:: 3.14
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Create Config
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-------------
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.. c:struct:: PyInitConfig
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Opaque structure to configure the Python initialization.
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.. c:function:: PyInitConfig* PyInitConfig_Create(void)
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Create a new initialization configuration using :ref:`Isolated Configuration
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<init-isolated-conf>` default values.
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It must be freed by :c:func:`PyInitConfig_Free`.
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Return ``NULL`` on memory allocation failure.
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.. c:function:: void PyInitConfig_Free(PyInitConfig *config)
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Free memory of the initialization configuration *config*.
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If *config* is ``NULL``, no operation is performed.
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Error Handling
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--------------
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.. c:function:: int PyInitConfig_GetError(PyInitConfig* config, const char **err_msg)
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Get the *config* error message.
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* Set *\*err_msg* and return ``1`` if an error is set.
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* Set *\*err_msg* to ``NULL`` and return ``0`` otherwise.
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An error message is an UTF-8 encoded string.
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If *config* has an exit code, format the exit code as an error
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message.
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|
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The error message remains valid until another ``PyInitConfig``
|
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function is called with *config*. The caller doesn't have to free the
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error message.
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.. c:function:: int PyInitConfig_GetExitCode(PyInitConfig* config, int *exitcode)
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Get the *config* exit code.
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* Set *\*exitcode* and return ``1`` if *config* has an exit code set.
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* Return ``0`` if *config* has no exit code set.
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Only the ``Py_InitializeFromInitConfig()`` function can set an exit
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code if the ``parse_argv`` option is non-zero.
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An exit code can be set when parsing the command line failed (exit
|
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code ``2``) or when a command line option asks to display the command
|
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line help (exit code ``0``).
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Get Options
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-----------
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The configuration option *name* parameter must be a non-NULL
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null-terminated UTF-8 encoded string.
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.. c:function:: int PyInitConfig_HasOption(PyInitConfig *config, const char *name)
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Test if the configuration has an option called *name*.
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Return ``1`` if the option exists, or return ``0`` otherwise.
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.. c:function:: int PyInitConfig_GetInt(PyInitConfig *config, const char *name, int64_t *value)
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Get an integer configuration option.
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* Set *\*value*, and return ``0`` on success.
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* Set an error in *config* and return ``-1`` on error.
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.. c:function:: int PyInitConfig_GetStr(PyInitConfig *config, const char *name, char **value)
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Get a string configuration option as a null-terminated UTF-8
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encoded string.
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* Set *\*value*, and return ``0`` on success.
|
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* Set an error in *config* and return ``-1`` on error.
|
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*\*value* can be set to ``NULL`` if the option is an optional string and the
|
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option is unset.
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On success, the string must be released with ``free(value)`` if it's not
|
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``NULL``.
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.. c:function:: int PyInitConfig_GetStrList(PyInitConfig *config, const char *name, size_t *length, char ***items)
|
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|
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Get a string list configuration option as an array of
|
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null-terminated UTF-8 encoded strings.
|
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|
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* Set *\*length* and *\*value*, and return ``0`` on success.
|
||||
* Set an error in *config* and return ``-1`` on error.
|
||||
|
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On success, the string list must be released with
|
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``PyInitConfig_FreeStrList(length, items)``.
|
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.. c:function:: void PyInitConfig_FreeStrList(size_t length, char **items)
|
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|
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Free memory of a string list created by
|
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``PyInitConfig_GetStrList()``.
|
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|
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Set Options
|
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-----------
|
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|
||||
The configuration option *name* parameter must be a non-NULL null-terminated
|
||||
UTF-8 encoded string.
|
||||
|
||||
Some configuration options have side effects on other options. This logic is
|
||||
only implemented when ``Py_InitializeFromInitConfig()`` is called, not by the
|
||||
"Set" functions below. For example, setting ``dev_mode`` to ``1`` does not set
|
||||
``faulthandler`` to ``1``.
|
||||
|
||||
.. c:function:: int PyInitConfig_SetInt(PyInitConfig *config, const char *name, int64_t value)
|
||||
|
||||
Set an integer configuration option.
|
||||
|
||||
* Return ``0`` on success.
|
||||
* Set an error in *config* and return ``-1`` on error.
|
||||
|
||||
|
||||
.. c:function:: int PyInitConfig_SetStr(PyInitConfig *config, const char *name, const char *value)
|
||||
|
||||
Set a string configuration option from a null-terminated UTF-8
|
||||
encoded string. The string is copied.
|
||||
|
||||
* Return ``0`` on success.
|
||||
* Set an error in *config* and return ``-1`` on error.
|
||||
|
||||
|
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.. c:function:: int PyInitConfig_SetStrList(PyInitConfig *config, const char *name, size_t length, char * const *items)
|
||||
|
||||
Set a string list configuration option from an array of
|
||||
null-terminated UTF-8 encoded strings. The string list is copied.
|
||||
|
||||
* Return ``0`` on success.
|
||||
* Set an error in *config* and return ``-1`` on error.
|
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|
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|
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Module
|
||||
------
|
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|
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.. c:function:: int PyInitConfig_AddModule(PyInitConfig *config, const char *name, PyObject* (*initfunc)(void))
|
||||
|
||||
Add a built-in extension module to the table of built-in modules.
|
||||
|
||||
The new module can be imported by the name *name*, and uses the function
|
||||
*initfunc* as the initialization function called on the first attempted
|
||||
import.
|
||||
|
||||
* Return ``0`` on success.
|
||||
* Set an error in *config* and return ``-1`` on error.
|
||||
|
||||
If Python is initialized multiple times, ``PyInitConfig_AddModule()`` must
|
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be called at each Python initialization.
|
||||
|
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Similar to the :c:func:`PyImport_AppendInittab` function.
|
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|
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|
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Initialize Python
|
||||
-----------------
|
||||
|
||||
.. c:function:: int Py_InitializeFromInitConfig(PyInitConfig *config)
|
||||
|
||||
Initialize Python from the initialization configuration.
|
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|
||||
* Return ``0`` on success.
|
||||
* Set an error in *config* and return ``-1`` on error.
|
||||
* Set an exit code in *config* and return ``-1`` if Python wants to
|
||||
exit.
|
||||
|
||||
See ``PyInitConfig_GetExitcode()`` for the exit code case.
|
||||
|
||||
|
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Example
|
||||
-------
|
||||
|
||||
Example initializing Python, set configuration options of various types,
|
||||
return ``-1`` on error:
|
||||
|
||||
.. code-block:: c
|
||||
|
||||
int init_python(void)
|
||||
{
|
||||
PyInitConfig *config = PyInitConfig_Create();
|
||||
if (config == NULL) {
|
||||
printf("PYTHON INIT ERROR: memory allocation failed\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
// Set an integer (dev mode)
|
||||
if (PyInitConfig_SetInt(config, "dev_mode", 1) < 0) {
|
||||
goto error;
|
||||
}
|
||||
|
||||
// Set a list of UTF-8 strings (argv)
|
||||
char *argv[] = {"my_program", "-c", "pass"};
|
||||
if (PyInitConfig_SetStrList(config, "argv",
|
||||
Py_ARRAY_LENGTH(argv), argv) < 0) {
|
||||
goto error;
|
||||
}
|
||||
|
||||
// Set a UTF-8 string (program name)
|
||||
if (PyInitConfig_SetStr(config, "program_name", L"my_program") < 0) {
|
||||
goto error;
|
||||
}
|
||||
|
||||
// Initialize Python with the configuration
|
||||
if (Py_InitializeFromInitConfig(config) < 0) {
|
||||
goto error;
|
||||
}
|
||||
PyInitConfig_Free(config);
|
||||
return 0;
|
||||
|
||||
error:
|
||||
{
|
||||
// Display the error message
|
||||
// This uncommon braces style is used, because you cannot make
|
||||
// goto targets point to variable declarations.
|
||||
const char *err_msg;
|
||||
(void)PyInitConfig_GetError(config, &err_msg);
|
||||
printf("PYTHON INIT ERROR: %s\n", err_msg);
|
||||
PyInitConfig_Free(config);
|
||||
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Runtime Python configuration API
|
||||
================================
|
||||
|
||||
The configuration option *name* parameter must be a non-NULL null-terminated
|
||||
UTF-8 encoded string.
|
||||
|
||||
Some options are read from the :mod:`sys` attributes. For example, the option
|
||||
``"argv"`` is read from :data:`sys.argv`.
|
||||
|
||||
|
||||
.. c:function:: PyObject* PyConfig_Get(const char *name)
|
||||
|
||||
Get the current runtime value of a configuration option as a Python object.
|
||||
|
||||
* Return a new reference on success.
|
||||
* Set an exception and return ``NULL`` on error.
|
||||
|
||||
The object type depends on the configuration option. It can be:
|
||||
|
||||
* ``bool``
|
||||
* ``int``
|
||||
* ``str``
|
||||
* ``list[str]``
|
||||
* ``dict[str, str]``
|
||||
|
||||
The caller must hold the GIL. The function cannot be called before
|
||||
Python initialization nor after Python finalization.
|
||||
|
||||
.. versionadded:: 3.14
|
||||
|
||||
|
||||
.. c:function:: int PyConfig_GetInt(const char *name, int *value)
|
||||
|
||||
Similar to :c:func:`PyConfig_Get`, but get the value as a C int.
|
||||
|
||||
* Return ``0`` on success.
|
||||
* Set an exception and return ``-1`` on error.
|
||||
|
||||
.. versionadded:: 3.14
|
||||
|
||||
|
||||
.. c:function:: PyObject* PyConfig_Names(void)
|
||||
|
||||
Get all configuration option names as a ``frozenset``.
|
||||
|
||||
* Return a new reference on success.
|
||||
* Set an exception and return ``NULL`` on error.
|
||||
|
||||
The caller must hold the GIL. The function cannot be called before
|
||||
Python initialization nor after Python finalization.
|
||||
|
||||
.. versionadded:: 3.14
|
||||
|
||||
|
||||
.. c:function:: int PyConfig_Set(const char *name, PyObject *value)
|
||||
|
||||
Set the current runtime value of a configuration option.
|
||||
|
||||
* Raise a :exc:`ValueError` if there is no option *name*.
|
||||
* Raise a :exc:`ValueError` if *value* is an invalid value.
|
||||
* Raise a :exc:`ValueError` if the option is read-only (cannot be set).
|
||||
* Raise a :exc:`TypeError` if *value* has not the proper type.
|
||||
|
||||
The caller must hold the GIL. The function cannot be called before
|
||||
Python initialization nor after Python finalization.
|
||||
|
||||
.. versionadded:: 3.14
|
||||
|
||||
|
||||
Py_GetArgcArgv()
|
||||
================
|
||||
|
|
|
|||
Loading…
Reference in New Issue