File Objects

Python’s built-in file objects are implemented entirely on the FILE* support from the C standard library. This is an implementation detail and may change in future releases of Python. The PyFile_ APIs are a wrapper over the io module.

PyFile_FromFd(int fd, char *name, char *mode, int buffering, char *encoding, char *newline, int closefd)

Create a new PyFileObject from the file descriptor of an already opened file fd. The arguments name, encoding and newline can be NULL to use the defaults; buffering can be -1 to use the default. Return NULL on failure.

Warning

Take care when you are mixing streams and descriptors! For more information, see the GNU C Library docs.

int PyObject_AsFileDescriptor(PyObject *p)

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.

Equivalent to p.readline([n]), this function reads one line from the object p. p may be a file object or any object with a readline() method. If n is 0, exactly one line is read, regardless of the length of the line. If n is greater than 0, no more than n bytes will be read from the file; a partial line can be returned. In both cases, an empty string is returned if the end of the file is reached immediately. If n is less than 0, however, one line is read regardless of length, but EOFError is raised if the end of the file is reached immediately.

int PyFile_WriteObject(PyObject *obj, PyObject *p, int flags)

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)

Write string s to file object p. Return 0 on success or -1 on failure; the appropriate exception will be set.