Module Objects — Python 3.11.15 documentation
Description: Initializing C modules: Modules objects are usually created from extension modules (shared libraries which export an initialization function), or compiled-in modules (where the initialization funct...

# Module Objects

PyTypeObject PyModule_Type
  Part of the Stable ABI.

  This instance of `PyTypeObject` represents the Python module type. This is exposed to Python programs as `types.ModuleType`.

int PyModule_Check(PyObject *p)

  Return true if p is a module object, or a subtype of a module object. This function always succeeds.

int PyModule_CheckExact(PyObject *p)

  Return true if p is a module object, but not a subtype of `PyModule_Type`. This function always succeeds.

PyObject *PyModule_NewObject(PyObject *name)
  Return value: New reference. Part of the Stable ABI since version 3.7.

  Return a new module object with the `__name__` attribute set to name. The module’s `__name__`, `__doc__`, `__package__`, and `__loader__` attributes are filled in (all but `__name__` are set to `None`); the caller is responsible for providing a `__file__` attribute.

  New in version 3.3.

  Changed in version 3.4: `__package__` and `__loader__` are set to `None`.

PyObject *PyModule_New(const char *name)
  Return value: New reference. Part of the Stable ABI.

  Similar to `PyModule_NewObject()`, but the name is a UTF-8 encoded string instead of a Unicode object.

PyObject *PyModule_GetDict(PyObject *module)
  Return value: Borrowed reference. Part of the Stable ABI.

  Return the dictionary object that implements module’s namespace; this object is the same as the `__dict__` attribute of the module object. If module is not a module object (or a subtype of a module object), `SystemError` is raised and `NULL` is returned.

  It is recommended extensions use other `PyModule_*` and `PyObject_*` functions rather than directly manipulate a module’s `__dict__`.

PyObject *PyModule_GetNameObject(PyObject *module)
  Return value: New reference. Part of the Stable ABI since version 3.7.

  Return module’s `__name__` value. If the module does not provide one, or if it is not a string, `SystemError` is raised and `NULL` is returned.

  New in version 3.3.

const char *PyModule_GetName(PyObject *module)
  Part of the Stable ABI.

  Similar to `PyModule_GetNameObject()` but return the name encoded to `'utf-8'`.

void *PyModule_GetState(PyObject *module)
  Part of the Stable ABI.

  Return the “state” of the module, that is, a pointer to the block of memory allocated at module creation time, or `NULL`. See `PyModuleDef.m_size`.

PyModuleDef *PyModule_GetDef(PyObject *module)
  Part of the Stable ABI.

  Return a pointer to the `PyModuleDef` struct from which the module was created, or `NULL` if the module wasn’t created from a definition.

PyObject *PyModule_GetFilenameObject(PyObject *module)
  Return value: New reference. Part of the Stable ABI.

  Return the name of the file from which module was loaded using module’s `__file__` attribute. If this is not defined, or if it is not a unicode string, raise `SystemError` and return `NULL`; otherwise return a reference to a Unicode object.

  New in version 3.2.

const char *PyModule_GetFilename(PyObject *module)
  Part of the Stable ABI.

  Similar to `PyModule_GetFilenameObject()` but return the filename encoded to ‘utf-8’.

  Deprecated since version 3.2: `PyModule_GetFilename()` raises `UnicodeEncodeError` on unencodable filenames, use `PyModule_GetFilenameObject()` instead.

## Initializing C modules

Modules objects are usually created from extension modules (shared libraries which export an initialization function), or compiled-in modules (where the initialization function is added using `PyImport_AppendInittab()`). See Building C and C++ Extensions or Extending Embedded Python for details.

The initialization function can either pass a module definition instance to `PyModule_Create()`, and return the resulting module object, or request “multi-phase initialization” by returning the definition struct itself.

type PyModuleDef
  Part of the Stable ABI (including all members).

  The module definition struct, which holds all information needed to create a module object. There is usually only one statically initialized variable of this type for each module.

  PyModuleDef_Base m_base

    Always initialize this member to `PyModuleDef_HEAD_INIT`.

  const char *m_name

    Name for the new module.

  const char *m_doc

    Docstring for the module; usually a docstring variable created with `PyDoc_STRVAR` is used.

  Py_ssize_t m_size

    Module state may be kept in a per-module memory area that can be retrieved with `PyModule_GetState()`, rather than in static globals. This makes modules safe for use in multiple sub-interpreters.

    This memory area is allocated based on m_size on module creation, and freed when the module object is deallocated, after the `m_free` function has been called, if present.

    Setting `m_size` to `-1` means that the module does not support sub-interpreters, because it has global state.

    Setting it to a non-negative value means that the module can be re-initialized and specifies the additional amount of memory it requires for its state. Non-negative `m_size` is required for multi-phase initialization.

    See PEP 3121 for more details.

  PyMethodDef *m_methods

    A pointer to a table of module-level functions, described by `PyMethodDef` values. Can be `NULL` if no functions are present.

  PyModuleDef_Slot *m_slots

    An array of slot definitions for multi-phase initialization, terminated by a `{0, NULL}` entry. When using single-phase initialization, m_slots must be `NULL`.

    Changed in version 3.5: Prior to version 3.5, this member was always set to `NULL`, and was defined as:

    > inquiry m_reload

  traverseproc m_traverse

    A traversal function to call during GC traversal of the module object, or `NULL` if not needed.

    This function is not called if the module state was requested but is not allocated yet. This is the case immediately after the module is created and before the module is executed (`Py_mod_exec` function). More precisely, this function is not called if `m_size` is greater than 0 and the module state (as returned by `PyModule_GetState()`) is `NULL`.

    Changed in version 3.9: No longer called before the module state is allocated.

  inquiry m_clear

    A clear function to call during GC clearing of the module object, or `NULL` if not needed.

    This function is not called if the module state was requested but is not allocated yet. This is the case immediately after the module is created and before the module is executed (`Py_mod_exec` function). More precisely, this function is not called if `m_size` is greater than 0 and the module state (as returned by `PyModule_GetState()`) is `NULL`.

    Like `PyTypeObject.tp_clear`, this function is not always called before a module is deallocated. For example, when reference counting is enough to determine that an object is no longer used, the cyclic garbage collector is not involved and `m_free` is called directly.

    Changed in version 3.9: No longer called before the module state is allocated.

  freefunc m_free

    A function to call during deallocation of the module object, or `NULL` if not needed.

    This function is not called if the module state was requested but is not allocated yet. This is the case immediately after the module is created and before the module is executed (`Py_mod_exec` function). More precisely, this function is not called if `m_size` is greater than 0 and the module state (as returned by `PyModule_GetState()`) is `NULL`.

    Changed in version 3.9: No longer called before the module state is allocated.

### Single-phase initialization

The module initialization function may create and return the module object directly. This is referred to as “single-phase initialization”, and uses one of the following two module creation functions:

PyObject *PyModule_Create(PyModuleDef *def)
  Return value: New reference.

  Create a new module object, given the definition in def. This behaves like `PyModule_Create2()` with module_api_version set to `PYTHON_API_VERSION`.

PyObject *PyModule_Create2(PyModuleDef *def, int module_api_version)
  Return value: New reference. Part of the Stable ABI.

  Create a new module object, given the definition in def, assuming the API version module_api_version. If that version does not match the version of the running interpreter, a `RuntimeWarning` is emitted.

  Note

  Most uses of this function should be using `PyModule_Create()` instead; only use this if you are sure you need it.

Before it is returned from in the initialization function, the resulting module object is typically populated using functions like `PyModule_AddObjectRef()`.

### Multi-phase initialization

An alternate way to specify extensions is to request “multi-phase initialization”. Extension modules created this way behave more like Python modules: the initialization is split between the creation phase, when the module object is created, and the execution phase, when it is populated. The distinction is similar to the `__new__()` and `__init__()` methods of classes.

Unlike modules created using single-phase initialization, these modules are not singletons: if the sys.modules entry is removed and the module is re-imported, a new module object is created, and the old module is subject to normal garbage collection – as with Python modules. By default, multiple modules created from the same definition should be independent: changes to one should not affect the others. This means that all state should be specific to the module object (using e.g. using `PyModule_GetState()`), or its contents (such as the module’s `__dict__` or individual classes created with `PyType_FromSpec()`).

All modules created using multi-phase initialization are expected to support sub-interpreters. Making sure multiple modules are independent is typically enough to achieve this.

To request multi-phase initialization, the initialization function (PyInit_modulename) returns a `PyModuleDef` instance with non-empty `m_slots`. Before it is returned, the `PyModuleDef` instance must be initialized with the following function:

PyObject *PyModuleDef_Init(PyModuleDef *def)
  Return value: Borrowed reference. Part of the Stable ABI since version 3.5.

  Ensures a module definition is a properly initialized Python object that correctly reports its type and reference count.

  Returns def cast to `PyObject*`, or `NULL` if an error occurred.

  New in version 3.5.

The m_slots member of the module definition must point to an array of `PyModuleDef_Slot` structures:

type PyModuleDef_Slot
  int slot

    A slot ID, chosen from the available values explained below.

  void *value

    Value of the slot, whose meaning depends on the slot ID.

  New in version 3.5.

The m_slots array must be terminated by a slot with id 0.

The available slot types are:

Py_mod_create

  Specifies a function that is called to create the module object itself. The value pointer of this slot must point to a function of the signature:

  PyObject *create_module(PyObject *spec, PyModuleDef *def)

  The function receives a `ModuleSpec` instance, as defined in PEP 451, and the module definition. It should return a new module object, or set an error and return `NULL`.

  This function should be kept minimal. In particular, it should not call arbitrary Python code, as trying to import the same module again may result in an infinite loop.

  Multiple `Py_mod_create` slots may not be specified in one module definition.

  If `Py_mod_create` is not specified, the import machinery will create a normal module object using `PyModule_New()`. The name is taken from spec, not the definition, to allow extension modules to dynamically adjust to their place in the module hierarchy and be imported under different names through symlinks, all while sharing a single module definition.

  There is no requirement for the returned object to be an instance of `PyModule_Type`. Any type can be used, as long as it supports setting and getting import-related attributes. However, only `PyModule_Type` instances may be returned if the `PyModuleDef` has non-`NULL` `m_traverse`, `m_clear`, `m_free`; non-zero `m_size`; or slots other than `Py_mod_create`.

Py_mod_exec

  Specifies a function that is called to execute the module. This is equivalent to executing the code of a Python module: typically, this function adds classes and constants to the module. The signature of the function is:

  int exec_module(PyObject *module)

  If multiple `Py_mod_exec` slots are specified, they are processed in the order they appear in the m_slots array.

See PEP 489 for more details on multi-phase initialization.

### Low-level module creation functions

The following functions are called under the hood when using multi-phase initialization. They can be used directly, for example when creating module objects dynamically. Note that both `PyModule_FromDefAndSpec` and `PyModule_ExecDef` must be called to fully initialize a module.

PyObject *PyModule_FromDefAndSpec(PyModuleDef *def, PyObject *spec)
  Return value: New reference.

  Create a new module object, given the definition in def and the ModuleSpec spec. This behaves like `PyModule_FromDefAndSpec2()` with module_api_version set to `PYTHON_API_VERSION`.

  New in version 3.5.

PyObject *PyModule_FromDefAndSpec2(PyModuleDef *def, PyObject *spec, int module_api_version)
  Return value: New reference. Part of the Stable ABI since version 3.7.

  Create a new module object, given the definition in def and the ModuleSpec spec, assuming the API version module_api_version. If that version does not match the version of the running interpreter, a `RuntimeWarning` is emitted.

  Note

  Most uses of this function should be using `PyModule_FromDefAndSpec()` instead; only use this if you are sure you need it.

  New in version 3.5.

int PyModule_ExecDef(PyObject *module, PyModuleDef *def)
  Part of the Stable ABI since version 3.7.

  Process any execution slots (`Py_mod_exec`) given in def.

  New in version 3.5.

int PyModule_SetDocString(PyObject *module, const char *docstring)
  Part of the Stable ABI since version 3.7.

  Set the docstring for module to docstring. This function is called automatically when creating a module from `PyModuleDef`, using either `PyModule_Create` or `PyModule_FromDefAndSpec`.

  New in version 3.5.

int PyModule_AddFunctions(PyObject *module, PyMethodDef *functions)
  Part of the Stable ABI since version 3.7.

  Add the functions from the `NULL` terminated functions array to module. Refer to the `PyMethodDef` documentation for details on individual entries (due to the lack of a shared module namespace, module level “functions” implemented in C typically receive the module as their first parameter, making them similar to instance methods on Python classes). This function is called automatically when creating a module from `PyModuleDef`, using either `PyModule_Create` or `PyModule_FromDefAndSpec`.

  New in version 3.5.

### Support functions

The module initialization function (if using single phase initialization) or a function called from a module execution slot (if using multi-phase initialization), can use the following functions to help initialize the module state:

int PyModule_AddObjectRef(PyObject *module, const char *name, PyObject *value)
  Part of the Stable ABI since version 3.10.

  Add an object to module as name. This is a convenience function which can be used from the module’s initialization function.

  On success, return `0`. On error, raise an exception and return `-1`.

  Return `NULL` if value is `NULL`. It must be called with an exception raised in this case.

  Example usage:

      static int
      add_spam(PyObject *module, int value)
      {
          PyObject *obj = PyLong_FromLong(value);
          if (obj == NULL) {
              return -1;
          }
          int res = PyModule_AddObjectRef(module, "spam", obj);
          Py_DECREF(obj);
          return res;
       }

  The example can also be written without checking explicitly if obj is `NULL`:

      static int
      add_spam(PyObject *module, int value)
      {
          PyObject *obj = PyLong_FromLong(value);
          int res = PyModule_AddObjectRef(module, "spam", obj);
          Py_XDECREF(obj);
          return res;
       }

  Note that `Py_XDECREF()` should be used instead of `Py_DECREF()` in this case, since obj can be `NULL`.

  New in version 3.10.

int PyModule_AddObject(PyObject *module, const char *name, PyObject *value)
  Part of the Stable ABI.

  Similar to `PyModule_AddObjectRef()`, but steals a reference to value on success (if it returns `0`).

  The new `PyModule_AddObjectRef()` function is recommended, since it is easy to introduce reference leaks by misusing the `PyModule_AddObject()` function.

  Note

  Unlike other functions that steal references, `PyModule_AddObject()` only releases the reference to value on success.

  This means that its return value must be checked, and calling code must `Py_DECREF()` value manually on error.

  Example usage:

      static int
      add_spam(PyObject *module, int value)
      {
          PyObject *obj = PyLong_FromLong(value);
          if (obj == NULL) {
              return -1;
          }
          if (PyModule_AddObject(module, "spam", obj) < 0) {
              Py_DECREF(obj);
              return -1;
          }
          // PyModule_AddObject() stole a reference to obj:
          // Py_DECREF(obj) is not needed here
          return 0;
      }

  The example can also be written without checking explicitly if obj is `NULL`:

      static int
      add_spam(PyObject *module, int value)
      {
          PyObject *obj = PyLong_FromLong(value);
          if (PyModule_AddObject(module, "spam", obj) < 0) {
              Py_XDECREF(obj);
              return -1;
          }
          // PyModule_AddObject() stole a reference to obj:
          // Py_DECREF(obj) is not needed here
          return 0;
      }

  Note that `Py_XDECREF()` should be used instead of `Py_DECREF()` in this case, since obj can be `NULL`.

int PyModule_AddIntConstant(PyObject *module, const char *name, long value)
  Part of the Stable ABI.

  Add an integer constant to module as name. This convenience function can be used from the module’s initialization function. Return `-1` on error, `0` on success.

int PyModule_AddStringConstant(PyObject *module, const char *name, const char *value)
  Part of the Stable ABI.

  Add a string constant to module as name. This convenience function can be used from the module’s initialization function. The string value must be `NULL`-terminated. Return `-1` on error, `0` on success.

PyModule_AddIntMacro(module, macro)

  Add an int constant to module. The name and the value are taken from macro. For example `PyModule_AddIntMacro(module, AF_INET)` adds the int constant AF_INET with the value of AF_INET to module. Return `-1` on error, `0` on success.

PyModule_AddStringMacro(module, macro)

  Add a string constant to module.

int PyModule_AddType(PyObject *module, PyTypeObject *type)
  Part of the Stable ABI since version 3.10.

  Add a type object to module. The type object is finalized by calling internally `PyType_Ready()`. The name of the type object is taken from the last component of `tp_name` after dot. Return `-1` on error, `0` on success.

  New in version 3.9.

## Module lookup

Single-phase initialization creates singleton modules that can be looked up in the context of the current interpreter. This allows the module object to be retrieved later with only a reference to the module definition.

These functions will not work on modules created using multi-phase initialization, since multiple such modules can be created from a single definition.

PyObject *PyState_FindModule(PyModuleDef *def)
  Return value: Borrowed reference. Part of the Stable ABI.

  Returns the module object that was created from def for the current interpreter. This method requires that the module object has been attached to the interpreter state with `PyState_AddModule()` beforehand. In case the corresponding module object is not found or has not been attached to the interpreter state yet, it returns `NULL`.

int PyState_AddModule(PyObject *module, PyModuleDef *def)
  Part of the Stable ABI since version 3.3.

  Attaches the module object passed to the function to the interpreter state. This allows the module object to be accessible via `PyState_FindModule()`.

  Only effective on modules created using single-phase initialization.

  Python calls `PyState_AddModule` automatically after importing a module, so it is unnecessary (but harmless) to call it from module initialization code. An explicit call is needed only if the module’s own init code subsequently calls `PyState_FindModule`. The function is mainly intended for implementing alternative import mechanisms (either by calling it directly, or by referring to its implementation for details of the required state updates).

  The caller must hold the GIL.

  Return 0 on success or -1 on failure.

  New in version 3.3.

int PyState_RemoveModule(PyModuleDef *def)
  Part of the Stable ABI since version 3.3.

  Removes the module object created from def from the interpreter state. Return 0 on success or -1 on failure.

  The caller must hold the GIL.

  New in version 3.3.