Importando Módulos
******************

PyObject* PyImport_ImportModule(const char *name)
    *Return value: New reference.*

   This is a simplified interface to "PyImport_ImportModuleEx()"
   below, leaving the *globals* and *locals* arguments set to *NULL*
   and *level* set to 0.  When the *name* argument contains a dot
   (when it specifies a submodule of a package), the *fromlist*
   argument is set to the list "['*']" so that the return value is the
   named module rather than the top-level package containing it as
   would otherwise be the case.  (Unfortunately, this has an
   additional side effect when *name* in fact specifies a subpackage
   instead of a submodule: the submodules specified in the package’s
   "__all__" variable are  loaded.)  Return a new reference to the
   imported module, or *NULL* with an exception set on failure.
   Before Python 2.4, the module may still be created in the failure
   case — examine "sys.modules" to find out.  Starting with Python
   2.4, a failing import of a module no longer leaves the module in
   "sys.modules".

   Alterado na versão 2.4: Failing imports remove incomplete module
   objects.

   Alterado na versão 2.6: Always uses absolute imports.

PyObject* PyImport_ImportModuleNoBlock(const char *name)

   This version of "PyImport_ImportModule()" does not block. It’s
   intended to be used in C functions that import other modules to
   execute a function. The import may block if another thread holds
   the import lock. The function "PyImport_ImportModuleNoBlock()"
   never blocks. It first tries to fetch the module from sys.modules
   and falls back to "PyImport_ImportModule()" unless the lock is
   held, in which case the function will raise an "ImportError".

   Novo na versão 2.6.

PyObject* PyImport_ImportModuleEx(char *name, PyObject *globals, PyObject *locals, PyObject *fromlist)
    *Return value: New reference.*

   Importar um módulo. Isso é melhor descrito referindo-se à função
   interna do Python "__import__()", já que a função padrão:
   func:*__import__* chama essa função diretamente.

   The return value is a new reference to the imported module or top-
   level package, or *NULL* with an exception set on failure (before
   Python 2.4, the module may still be created in this case).  Like
   for "__import__()", the return value when a submodule of a package
   was requested is normally the top-level package, unless a non-empty
   *fromlist* was given.

   Alterado na versão 2.4: Failing imports remove incomplete module
   objects.

   Alterado na versão 2.6: The function is an alias for
   "PyImport_ImportModuleLevel()" with "-1" as level, meaning relative
   import.

PyObject* PyImport_ImportModuleLevel(char *name, PyObject *globals, PyObject *locals, PyObject *fromlist, int level)
    *Return value: New reference.*

   Importar um módulo. Isso é melhor descrito referindo-se à função
   interna do Python "__import__()", já que a função padrão:
   func:*__import__* chama essa função diretamente.

   O valor retornado é uma nova referência ao módulo importado ou ao
   pacote localizado no nível acima, ou *NULL* através de uma exceção
   definida pela falha.  Como na "__import__()", o valor retornado
   quando um submódulo foi solicitado é o pacote de nível superior, a
   menos que uma *fromlist* tenha sido informada.

   Novo na versão 2.5.

PyObject* PyImport_Import(PyObject *name)
    *Return value: New reference.*

   This is a higher-level interface that calls the current “import
   hook function”. It invokes the "__import__()" function from the
   "__builtins__" of the current globals.  This means that the import
   is done using whatever import hooks are installed in the current
   environment, e.g. by "rexec" or "ihooks".

   Alterado na versão 2.6: Always uses absolute imports.

PyObject* PyImport_ReloadModule(PyObject *m)
    *Return value: New reference.*

   Reload a module.  This is best described by referring to the built-
   in Python function "reload()", as the standard "reload()" function
   calls this function directly.  Return a new reference to the
   reloaded module, or *NULL* with an exception set on failure (the
   module still exists in this case).

PyObject* PyImport_AddModule(const char *name)
    *Return value: Borrowed reference.*

   Retornar o objeto módulo correspondente ao nome do módulo. O
   argumento *name* pode estar no  formato "package.module". Primeiro
   confira no dicionário dos módulos se há um lá, e se não houver,
   crie um novo e insira este dentro do dicionários dos módulos.
   Retorna *NULL* com uma exceção definida pela falha.

   Nota: Esta função não carrega ou importa o módulo; se o módulo
     não foi carregado, você receberá um objeto de módulo vazio.
     Utilize "PyImport_ImportModule()" ou uma de suas variações para
     importar um módulo.  Estruturas de pacotes implícitos através de
     um ponto no nome para a *name* não são criados se não estiverem
     presentes.

PyObject* PyImport_ExecCodeModule(char *name, PyObject *co)
    *Return value: New reference.*

   Given a module name (possibly of the form "package.module") and a
   code object read from a Python bytecode file or obtained from the
   built-in function "compile()", load the module.  Return a new
   reference to the module object, or *NULL* with an exception set if
   an error occurred.  Before Python 2.4, the module could still be
   created in error cases.  Starting with Python 2.4, *name* is
   removed from "sys.modules" in error cases, and even if *name* was
   already in "sys.modules" on entry to "PyImport_ExecCodeModule()".
   Leaving incompletely initialized modules in "sys.modules" is
   dangerous, as imports of such modules have no way to know that the
   module object is an unknown (and probably damaged with respect to
   the module author’s intents) state.

   The module’s "__file__" attribute will be set to the code object’s
   "co_filename".

   Esta função poderá recarregar o módulo se este já foi importado.
   Veja "PyImport_ReloadModule()" para forma desejada de recarregar um
   módulo.

   Se *name*  apontar para um nome com ponto no formato de
   "package.module", qualquer estruturas de pacotes que não tenha sido
   criada não será mais criada.

   Alterado na versão 2.4: *name* is removed from "sys.modules" in
   error cases.

PyObject* PyImport_ExecCodeModuleEx(char *name, PyObject *co, char *pathname)
    *Return value: New reference.*

   Como "PyImport_ExecCodeModule()", mas o atributo "__file__"  do
   objeto módulo é definido como *pathname*  se não for "NULL".

long PyImport_GetMagicNumber()

   Return the magic number for Python bytecode files (a.k.a. ".pyc"
   and ".pyo" files).  The magic number should be present in the first
   four bytes of the bytecode file, in little-endian byte order.

PyObject* PyImport_GetModuleDict()
    *Return value: Borrowed reference.*

   Return the dictionary used for the module administration (a.k.a.
   "sys.modules").  Note that this is a per-interpreter variable.

PyObject* PyImport_GetImporter(PyObject *path)

   Return an importer object for a "sys.path"/"pkg.__path__" item
   *path*, possibly by fetching it from the "sys.path_importer_cache"
   dict.  If it wasn’t yet cached, traverse "sys.path_hooks" until a
   hook is found that can handle the path item.  Return "None" if no
   hook could; this tells our caller it should fall back to the built-
   in import mechanism. Cache the result in "sys.path_importer_cache".
   Return a new reference to the importer object.

   Novo na versão 2.6.

void _PyImport_Init()

   Inicia o mecanismo de importação. Apenas para uso interno.

void PyImport_Cleanup()

   Esvazia a tabela do módulo. Apenas para uso interno.

void _PyImport_Fini()

   Finaliza o mecanismo de importação. Apenas para uso interno.

PyObject* _PyImport_FindExtension(char *, char *)

   Apenas para uso interno.

PyObject* _PyImport_FixupExtension(char *, char *)

   Apenas para uso interno.

int PyImport_ImportFrozenModule(char *name)

   Load a frozen module named *name*.  Return "1" for success, "0" if
   the module is not found, and "-1" with an exception set if the
   initialization failed.  To access the imported module on a
   successful load, use "PyImport_ImportModule()".  (Note the misnomer
   — this function would reload the module if it was already
   imported.)

struct _frozen

   This is the structure type definition for frozen module
   descriptors, as generated by the **freeze** utility (see
   "Tools/freeze/" in the Python source distribution).  Its
   definition, found in "Include/import.h", is:

      struct _frozen {
          char *name;
          unsigned char *code;
          int size;
      };

struct _frozen* PyImport_FrozenModules

   This pointer is initialized to point to an array of "struct
   _frozen" records, terminated by one whose members are all *NULL* or
   zero.  When a frozen module is imported, it is searched in this
   table.  Third-party code could play tricks with this to provide a
   dynamically created collection of frozen modules.

int PyImport_AppendInittab(const char *name, void (*initfunc)(void))

   Add a single module to the existing table of built-in modules.
   This is a convenience wrapper around "PyImport_ExtendInittab()",
   returning "-1" if the table could not be extended.  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.  This should be called before "Py_Initialize()".

struct _inittab

   Structure describing a single entry in the list of built-in
   modules.  Each of these structures gives the name and
   initialization function for a module built into the interpreter.
   Programs which embed Python may use an array of these structures in
   conjunction with "PyImport_ExtendInittab()" to provide additional
   built-in modules.  The structure is defined in "Include/import.h"
   as:

      struct _inittab {
          char *name;
          void (*initfunc)(void);
      };

int PyImport_ExtendInittab(struct _inittab *newtab)

   Add a collection of modules to the table of built-in modules.  The
   *newtab* array must end with a sentinel entry which contains *NULL*
   for the "name" field; failure to provide the sentinel value can
   result in a memory fault. Returns "0" on success or "-1" if
   insufficient memory could be allocated to extend the internal
   table.  In the event of failure, no modules are added to the
   internal table.  This should be called before "Py_Initialize()".
