203 lines
6.6 KiB
ReStructuredText
203 lines
6.6 KiB
ReStructuredText
.. highlightlang:: c
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.. _moduleobjects:
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Module Objects
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--------------
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.. index:: object: module
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There are only a few functions special to module objects.
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.. cvar:: PyTypeObject PyModule_Type
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.. index:: single: ModuleType (in module types)
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This instance of :ctype:`PyTypeObject` represents the Python module type. This
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is exposed to Python programs as ``types.ModuleType``.
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.. cfunction:: int PyModule_Check(PyObject *p)
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Return true if *p* is a module object, or a subtype of a module object.
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.. cfunction:: int PyModule_CheckExact(PyObject *p)
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Return true if *p* is a module object, but not a subtype of
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:cdata:`PyModule_Type`.
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.. cfunction:: PyObject* PyModule_New(const char *name)
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.. index::
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single: __name__ (module attribute)
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single: __doc__ (module attribute)
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single: __file__ (module attribute)
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Return a new module object with the :attr:`__name__` attribute set to *name*.
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Only the module's :attr:`__doc__` and :attr:`__name__` attributes are filled in;
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the caller is responsible for providing a :attr:`__file__` attribute.
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.. cfunction:: PyObject* PyModule_GetDict(PyObject *module)
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.. index:: single: __dict__ (module attribute)
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Return the dictionary object that implements *module*'s namespace; this object
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is the same as the :attr:`__dict__` attribute of the module object. This
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function never fails. It is recommended extensions use other
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:cfunc:`PyModule_\*` and :cfunc:`PyObject_\*` functions rather than directly
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manipulate a module's :attr:`__dict__`.
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.. cfunction:: char* PyModule_GetName(PyObject *module)
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.. index::
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single: __name__ (module attribute)
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single: SystemError (built-in exception)
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Return *module*'s :attr:`__name__` value. If the module does not provide one,
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or if it is not a string, :exc:`SystemError` is raised and *NULL* is returned.
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.. cfunction:: char* PyModule_GetFilename(PyObject *module)
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.. index::
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single: __file__ (module attribute)
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single: SystemError (built-in exception)
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Return the name of the file from which *module* was loaded using *module*'s
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:attr:`__file__` attribute. If this is not defined, or if it is not a string,
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raise :exc:`SystemError` and return *NULL*.
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.. cfunction:: void* PyModule_GetState(PyObject *module)
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Return the "state" of the module, that is, a pointer to the block of memory
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allocated at module creation time, or *NULL*. See
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:cmember:`PyModuleDef.m_size`.
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.. cfunction:: PyModuleDef* PyModule_GetDef(PyObject *module)
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Return a pointer to the :ctype:`PyModuleDef` struct from which the module was
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created, or *NULL* if the module wasn't created with
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:cfunc:`PyModule_Create`.
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Initializing C modules
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^^^^^^^^^^^^^^^^^^^^^^
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These functions are usually used in the module initialization function.
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.. cfunction:: PyObject* PyModule_Create(PyModuleDef *module)
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Create a new module object, given the definition in *module*. This behaves
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like :cfunc:`PyModule_Create2` with *module_api_version* set to
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:const:`PYTHON_API_VERSION`.
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.. cfunction:: PyObject* PyModule_Create2(PyModuleDef *module, int module_api_version)
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Create a new module object, given the definition in *module*, assuming the
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API version *module_api_version*. If that version does not match the version
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of the running interpreter, a :exc:`RuntimeWarning` is emitted.
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.. note::
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Most uses of this function should be using :cfunc:`PyModule_Create`
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instead; only use this if you are sure you need it.
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.. ctype:: PyModuleDef
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This struct holds all information that is needed to create a module object.
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There is usually only one static variable of that type for each module, which
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is statically initialized and then passed to :cfunc:`PyModule_Create` in the
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module initialization function.
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.. cmember:: PyModuleDef_Base m_base
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Always initialize this member to :const:`PyModuleDef_HEAD_INIT`.
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.. cmember:: char* m_name
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Name for the new module.
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.. cmember:: char* m_doc
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Docstring for the module; usually a docstring variable created with
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:cfunc:`PyDoc_STRVAR` is used.
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.. cmember:: Py_ssize_t m_size
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If the module object needs additional memory, this should be set to the
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number of bytes to allocate; a pointer to the block of memory can be
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retrieved with :cfunc:`PyModule_GetState`. If no memory is needed, set
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this to ``-1``.
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This memory should be used, rather than static globals, to hold per-module
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state, since it is then safe for use in multiple sub-interpreters. It is
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freed when the module object is deallocated, after the :cmember:`m_free`
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function has been called, if present.
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.. cmember:: PyMethodDef* m_methods
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A pointer to a table of module-level functions, described by
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:ctype:`PyMethodDef` values. Can be *NULL* if no functions are present.
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.. cmember:: inquiry m_reload
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Currently unused, should be *NULL*.
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.. cmember:: traverseproc m_traverse
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A traversal function to call during GC traversal of the module object, or
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*NULL* if not needed.
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.. cmember:: inquiry m_clear
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A clear function to call during GC clearing of the module object, or
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*NULL* if not needed.
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.. cmember:: freefunc m_free
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A function to call during deallocation of the module object, or *NULL* if
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not needed.
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.. cfunction:: int PyModule_AddObject(PyObject *module, const char *name, PyObject *value)
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Add an object to *module* as *name*. This is a convenience function which can
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be used from the module's initialization function. This steals a reference to
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*value*. Return ``-1`` on error, ``0`` on success.
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.. cfunction:: int PyModule_AddIntConstant(PyObject *module, const char *name, long value)
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Add an integer constant to *module* as *name*. This convenience function can be
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used from the module's initialization function. Return ``-1`` on error, ``0`` on
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success.
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.. cfunction:: int PyModule_AddStringConstant(PyObject *module, const char *name, const char *value)
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Add a string constant to *module* as *name*. This convenience function can be
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used from the module's initialization function. The string *value* must be
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null-terminated. Return ``-1`` on error, ``0`` on success.
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.. cfunction:: int PyModule_AddIntMacro(PyObject *module, macro)
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Add an int constant to *module*. The name and the value are taken from
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*macro*. For example ``PyModule_AddConstant(module, AF_INET)`` adds the int
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constant *AF_INET* with the value of *AF_INET* to *module*.
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Return ``-1`` on error, ``0`` on success.
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.. cfunction:: int PyModule_AddStringMacro(PyObject *module, macro)
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Add a string constant to *module*.
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