Objets fichiers

These APIs are a minimal emulation of the Python 2 C API for built-in file objects, which used to rely on the buffered I/O (FILE*) support from the C standard library. In Python 3, files and streams use the new io module, which defines several layers over the low-level unbuffered I/O of the operating system. The functions described below are convenience C wrappers over these new APIs, and meant mostly for internal error reporting in the interpreter; third-party code is advised to access the io APIs instead.

PyObject *PyFile_FromFd(int fd, const char *name, const char *mode, int buffering, const char *encoding, const char *errors, const char *newline, int closefd)
Return value: New reference. Part of the Stable ABI.

Create a Python file object from the file descriptor of an already opened file fd. The arguments name, encoding, errors and newline can be NULL to use the defaults; buffering can be -1 to use the default. name is ignored and kept for backward compatibility. Return NULL on failure. For a more comprehensive description of the arguments, please refer to the io.open() function documentation.


Étant donné que les flux de données Python possèdent leur propre couche de tampon, les mélanger avec des descripteurs de fichiers du niveau du système d'exploitation peut produire des erreurs (comme par exemple un ordre des données inattendu).

Modifié dans la version 3.2: ignore l'attribut name

int PyObject_AsFileDescriptor(PyObject *p)
Part of the Stable ABI.

Return the file descriptor associated with p as an int. If the object is an integer, its value is returned. If not, the object's fileno() method is called if it exists; the method must return an integer, which is returned as the file descriptor value. Sets an exception and returns -1 on failure.

PyObject *PyFile_GetLine(PyObject *p, int n)
Return value: New reference. Part of the Stable ABI.

Cette fonction, équivalente à p.readline([n]), lit une ligne de l'objet p. p peut être un objet fichier ou n'importe quel objet qui possède une méthode readline(). Si n vaut 0, une seule ligne est lue, indépendamment de la taille de la ligne. Si n est plus grand que 0, un maximum de n octets seront lus en provenance du fichier ; une ligne partielle peut être renvoyée. Dans les deux cas, une chaîne de caractères vide est renvoyée si la fin du fichier est atteinte immédiatement. Cependant, si n est plus petit que 0, une ligne est lue indépendamment de sa taille, mais EOFError est levée si la fin du fichier est atteinte immédiatement.

int PyFile_SetOpenCodeHook(Py_OpenCodeHookFunction handler)

Overrides the normal behavior of io.open_code() to pass its parameter through the provided handler.

The handler is a function of type PyObject *(*)(PyObject *path, void *userData), where path is guaranteed to be PyUnicodeObject.

The userData pointer is passed into the hook function. Since hook functions may be called from different runtimes, this pointer should not refer directly to Python state.

As this hook is intentionally used during import, avoid importing new modules during its execution unless they are known to be frozen or available in sys.modules.

Once a hook has been set, it cannot be removed or replaced, and later calls to PyFile_SetOpenCodeHook() will fail. On failure, the function returns -1 and sets an exception if the interpreter has been initialized.

This function is safe to call before Py_Initialize().

Raises an auditing event setopencodehook with no arguments.

Nouveau dans la version 3.8.

int PyFile_WriteObject(PyObject *obj, PyObject *p, int flags)
Part of the Stable ABI.

Write object obj to file object p. The only supported flag for flags is Py_PRINT_RAW; if given, the str() of the object is written instead of the repr(). Return 0 on success or -1 on failure; the appropriate exception will be set.

int PyFile_WriteString(const char *s, PyObject *p)
Part of the Stable ABI.

Écrit la chaîne de caractères s dans l'objet fichier p. Retourne 0 en cas de succès ou -1 en cas d'échec ; l'exception appropriée sera mise en place.