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python3.2  3.2.2
Defines | Functions | Variables
_iomodule.c File Reference
#include "Python.h"
#include "structmember.h"
#include "_iomodule.h"

Go to the source code of this file.

Defines

#define PY_SSIZE_T_CLEAN
#define ADD_TYPE(type, name)

Functions

 PyDoc_STRVAR (module_doc,"The io module provides the Python interfaces to stream handling. The\n""builtin open function is defined in this module.\n""\n""At the top of the I/O hierarchy is the abstract base class IOBase. It\n""defines the basic interface to a stream. Note, however, that there is no\n""seperation between reading and writing to streams; implementations are\n""allowed to throw an IOError if they do not support a given operation.\n""\n""Extending IOBase is RawIOBase which deals simply with the reading and\n""writing of raw bytes to a stream. FileIO subclasses RawIOBase to provide\n""an interface to OS files.\n""\n""BufferedIOBase deals with buffering on a raw byte stream (RawIOBase). Its\n""subclasses, BufferedWriter, BufferedReader, and BufferedRWPair buffer\n""streams that are readable, writable, and both respectively.\n""BufferedRandom provides a buffered interface to random access\n""streams. BytesIO is a simple stream of in-memory bytes.\n""\n""Another IOBase subclass, TextIOBase, deals with the encoding and decoding\n""of streams into text. TextIOWrapper, which extends it, is a buffered text\n""interface to a buffered raw stream (`BufferedIOBase`). Finally, StringIO\n""is a in-memory stream for text.\n""\n""Argument names are not part of the specification, and only the arguments\n""of open() are intended to be used as keyword arguments.\n""\n""data:\n""\n""DEFAULT_BUFFER_SIZE\n""\n"" An int containing the default buffer size used by the module's buffered\n"" I/O classes. open() uses the file's blksize (as obtained by os.stat) if\n"" possible.\n")
static int blockingioerror_init (PyBlockingIOErrorObject *self, PyObject *args, PyObject *kwds)
 PyDoc_STRVAR (open_doc,"open(file, mode='r', buffering=-1, encoding=None,\n"" errors=None, newline=None, closefd=True) -> file object\n""\n""Open file and return a stream. Raise IOError upon failure.\n""\n""file is either a text or byte string giving the name (and the path\n""if the file isn't in the current working directory) of the file to\n""be opened or an integer file descriptor of the file to be\n""wrapped. (If a file descriptor is given, it is closed when the\n""returned I/O object is closed, unless closefd is set to False.)\n""\n""mode is an optional string that specifies the mode in which the file\n""is opened. It defaults to 'r' which means open for reading in text\n""mode. Other common values are 'w' for writing (truncating the file if\n""it already exists), and 'a' for appending (which on some Unix systems,\n""means that all writes append to the end of the file regardless of the\n""current seek position). In text mode, if encoding is not specified the\n""encoding used is platform dependent. (For reading and writing raw\n""bytes use binary mode and leave encoding unspecified.) The available\n""modes are:\n""\n""========= ===============================================================\n""Character Meaning\n""--------- ---------------------------------------------------------------\n""'r' open for reading (default)\n""'w' open for writing, truncating the file first\n""'a' open for writing, appending to the end of the file if it exists\n""'b' binary mode\n""'t' text mode (default)\n""'+' open a disk file for updating (reading and writing)\n""'U' universal newline mode (for backwards compatibility; unneeded\n"" for new code)\n""========= ===============================================================\n""\n""The default mode is 'rt' (open for reading text). For binary random\n""access, the mode 'w+b' opens and truncates the file to 0 bytes, while\n""'r+b' opens the file without truncation.\n""\n""Python distinguishes between files opened in binary and text modes,\n""even when the underlying operating system doesn't. Files opened in\n""binary mode (appending 'b' to the mode argument) return contents as\n""bytes objects without any decoding. In text mode (the default, or when\n""'t' is appended to the mode argument), the contents of the file are\n""returned as strings, the bytes having been first decoded using a\n""platform-dependent encoding or using the specified encoding if given.\n""\n""buffering is an optional integer used to set the buffering policy.\n""Pass 0 to switch buffering off (only allowed in binary mode), 1 to select\n""line buffering (only usable in text mode), and an integer > 1 to indicate\n""the size of a fixed-size chunk buffer. When no buffering argument is\n""given, the default buffering policy works as follows:\n""\n""* Binary files are buffered in fixed-size chunks; the size of the buffer\n"" is chosen using a heuristic trying to determine the underlying device's\n"" \"block size\" and falling back on `io.DEFAULT_BUFFER_SIZE`.\n"" On many systems, the buffer will typically be 4096 or 8192 bytes long.\n""\n""* \"Interactive\" text files (files for which isatty() returns True)\n"" use line buffering. Other text files use the policy described above\n"" for binary files.\n""\n""encoding is the name of the encoding used to decode or encode the\n""file. This should only be used in text mode. The default encoding is\n""platform dependent, but any encoding supported by Python can be\n""passed. See the codecs module for the list of supported encodings.\n""\n""errors is an optional string that specifies how encoding errors are to\n""be handled---this argument should not be used in binary mode. Pass\n""'strict' to raise a ValueError exception if there is an encoding error\n""(the default of None has the same effect), or pass 'ignore' to ignore\n""errors. (Note that ignoring encoding errors can lead to data loss.)\n""See the documentation for codecs.register for a list of the permitted\n""encoding error strings.\n""\n""newline controls how universal newlines works (it only applies to text\n""mode). It can be None, '', '\\n', '\\r', and '\\r\\n'. It works as\n""follows:\n""\n""* On input, if newline is None, universal newlines mode is\n"" enabled. Lines in the input can end in '\\n', '\\r', or '\\r\\n', and\n"" these are translated into '\\n' before being returned to the\n"" caller. If it is '', universal newline mode is enabled, but line\n"" endings are returned to the caller untranslated. If it has any of\n"" the other legal values, input lines are only terminated by the given\n"" string, and the line ending is returned to the caller untranslated.\n""\n""* On output, if newline is None, any '\\n' characters written are\n"" translated to the system default line separator, os.linesep. If\n"" newline is '', no translation takes place. If newline is any of the\n"" other legal values, any '\\n' characters written are translated to\n"" the given string.\n""\n""If closefd is False, the underlying file descriptor will be kept open\n""when the file is closed. This does not work when a file name is given\n""and must be True in that case.\n""\n""open() returns a file object whose type depends on the mode, and\n""through which the standard file operations such as reading and writing\n""are performed. When open() is used to open a file in a text mode ('w',\n""'r', 'wt', 'rt', etc.), it returns a TextIOWrapper. When used to open\n""a file in a binary mode, the returned class varies: in read binary\n""mode, it returns a BufferedReader; in write binary and append binary\n""modes, it returns a BufferedWriter, and in read/write mode, it returns\n""a BufferedRandom.\n""\n""It is also possible to use a string or bytearray as a file for both\n""reading and writing. For strings StringIO can be used like a file\n""opened in a text mode, and for bytes a BytesIO can be used like a file\n""opened in a binary mode.\n")
static PyObjectio_open (PyObject *self, PyObject *args, PyObject *kwds)
Py_off_t PyNumber_AsOff_t (PyObject *item, PyObject *err)
int _PyIO_ConvertSsize_t (PyObject *obj, void *result)
static int iomodule_traverse (PyObject *mod, visitproc visit, void *arg)
static int iomodule_clear (PyObject *mod)
static void iomodule_free (PyObject *mod)
PyMODINIT_FUNC PyInit__io (void)

Variables

PyObject_PyIO_str_close
PyObject_PyIO_str_closed
PyObject_PyIO_str_decode
PyObject_PyIO_str_encode
PyObject_PyIO_str_fileno
PyObject_PyIO_str_flush
PyObject_PyIO_str_getstate
PyObject_PyIO_str_isatty
PyObject_PyIO_str_newlines
PyObject_PyIO_str_nl
PyObject_PyIO_str_read
PyObject_PyIO_str_read1
PyObject_PyIO_str_readable
PyObject_PyIO_str_readinto
PyObject_PyIO_str_readline
PyObject_PyIO_str_reset
PyObject_PyIO_str_seek
PyObject_PyIO_str_seekable
PyObject_PyIO_str_setstate
PyObject_PyIO_str_tell
PyObject_PyIO_str_truncate
PyObject_PyIO_str_writable
PyObject_PyIO_str_write
PyObject_PyIO_empty_str
PyObject_PyIO_empty_bytes
PyObject_PyIO_zero
static PyMemberDef blockingioerror_members []
static PyTypeObject _PyExc_BlockingIOError
PyObjectPyExc_BlockingIOError = (PyObject *)&_PyExc_BlockingIOError
static PyMethodDef module_methods []

Define Documentation

#define ADD_TYPE (   type,
  name 
)
Value:
if (PyType_Ready(type) < 0) \
        goto fail; \
    Py_INCREF(type); \
    if (PyModule_AddObject(m, name, (PyObject *)type) < 0) {  \
        Py_DECREF(type); \
        goto fail; \
    }

Definition at line 10 of file _iomodule.c.


Function Documentation

int _PyIO_ConvertSsize_t ( PyObject obj,
void result 
)

Definition at line 580 of file _iomodule.c.

                                                  {
    Py_ssize_t limit;
    if (obj == Py_None) {
        limit = -1;
    }
    else if (PyNumber_Check(obj)) {
        limit = PyNumber_AsSsize_t(obj, PyExc_OverflowError);
        if (limit == -1 && PyErr_Occurred())
            return 0;
    }
    else {
        PyErr_Format(PyExc_TypeError,
                     "integer argument expected, got '%.200s'",
                     Py_TYPE(obj)->tp_name);
        return 0;
    }
    *((Py_ssize_t *)result) = limit;
    return 1;
}

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static int blockingioerror_init ( PyBlockingIOErrorObject self,
PyObject args,
PyObject kwds 
) [static]

Definition at line 97 of file _iomodule.c.

{
    PyObject *myerrno = NULL, *strerror = NULL;
    PyObject *baseargs = NULL;
    Py_ssize_t written = 0;

    assert(PyTuple_Check(args));

    self->written = 0;
    if (!PyArg_ParseTuple(args, "OO|n:BlockingIOError",
                          &myerrno, &strerror, &written))
        return -1;

    baseargs = PyTuple_Pack(2, myerrno, strerror);
    if (baseargs == NULL)
        return -1;
    /* This will take care of initializing of myerrno and strerror members */
    if (((PyTypeObject *)PyExc_IOError)->tp_init(
                (PyObject *)self, baseargs, kwds) == -1) {
        Py_DECREF(baseargs);
        return -1;
    }
    Py_DECREF(baseargs);

    self->written = written;
    return 0;
}

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static PyObject* io_open ( PyObject self,
PyObject args,
PyObject kwds 
) [static]

Definition at line 291 of file _iomodule.c.

{
    char *kwlist[] = {"file", "mode", "buffering",
                      "encoding", "errors", "newline",
                      "closefd", NULL};
    PyObject *file;
    char *mode = "r";
    int buffering = -1, closefd = 1;
    char *encoding = NULL, *errors = NULL, *newline = NULL;
    unsigned i;

    int reading = 0, writing = 0, appending = 0, updating = 0;
    int text = 0, binary = 0, universal = 0;

    char rawmode[5], *m;
    int line_buffering, isatty;

    PyObject *raw, *modeobj = NULL, *buffer = NULL, *wrapper = NULL;

    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|sizzzi:open", kwlist,
                                     &file, &mode, &buffering,
                                     &encoding, &errors, &newline,
                                     &closefd)) {
        return NULL;
    }

    if (!PyUnicode_Check(file) &&
       !PyBytes_Check(file) &&
       !PyNumber_Check(file)) {
        PyErr_Format(PyExc_TypeError, "invalid file: %R", file);
        return NULL;
    }

    /* Decode mode */
    for (i = 0; i < strlen(mode); i++) {
        char c = mode[i];

        switch (c) {
        case 'r':
            reading = 1;
            break;
        case 'w':
            writing = 1;
            break;
        case 'a':
            appending = 1;
            break;
        case '+':
            updating = 1;
            break;
        case 't':
            text = 1;
            break;
        case 'b':
            binary = 1;
            break;
        case 'U':
            universal = 1;
            reading = 1;
            break;
        default:
            goto invalid_mode;
        }

        /* c must not be duplicated */
        if (strchr(mode+i+1, c)) {
          invalid_mode:
            PyErr_Format(PyExc_ValueError, "invalid mode: '%s'", mode);
            return NULL;
        }

    }

    m = rawmode;
    if (reading)   *(m++) = 'r';
    if (writing)   *(m++) = 'w';
    if (appending) *(m++) = 'a';
    if (updating)  *(m++) = '+';
    *m = '\0';

    /* Parameters validation */
    if (universal) {
        if (writing || appending) {
            PyErr_SetString(PyExc_ValueError,
                            "can't use U and writing mode at once");
            return NULL;
        }
        reading = 1;
    }

    if (text && binary) {
        PyErr_SetString(PyExc_ValueError,
                        "can't have text and binary mode at once");
        return NULL;
    }

    if (reading + writing + appending > 1) {
        PyErr_SetString(PyExc_ValueError,
                        "must have exactly one of read/write/append mode");
        return NULL;
    }

    if (binary && encoding != NULL) {
        PyErr_SetString(PyExc_ValueError,
                        "binary mode doesn't take an encoding argument");
        return NULL;
    }

    if (binary && errors != NULL) {
        PyErr_SetString(PyExc_ValueError,
                        "binary mode doesn't take an errors argument");
        return NULL;
    }

    if (binary && newline != NULL) {
        PyErr_SetString(PyExc_ValueError,
                        "binary mode doesn't take a newline argument");
        return NULL;
    }

    /* Create the Raw file stream */
    raw = PyObject_CallFunction((PyObject *)&PyFileIO_Type,
                            "Osi", file, rawmode, closefd);
    if (raw == NULL)
        return NULL;

    modeobj = PyUnicode_FromString(mode);
    if (modeobj == NULL)
        goto error;

    /* buffering */
    {
        PyObject *res = PyObject_CallMethod(raw, "isatty", NULL);
        if (res == NULL)
            goto error;
        isatty = PyLong_AsLong(res);
        Py_DECREF(res);
        if (isatty == -1 && PyErr_Occurred())
            goto error;
    }

    if (buffering == 1 || (buffering < 0 && isatty)) {
        buffering = -1;
        line_buffering = 1;
    }
    else
        line_buffering = 0;

    if (buffering < 0) {
        buffering = DEFAULT_BUFFER_SIZE;
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
        {
            struct stat st;
            long fileno;
            PyObject *res = PyObject_CallMethod(raw, "fileno", NULL);
            if (res == NULL)
                goto error;

            fileno = PyLong_AsLong(res);
            Py_DECREF(res);
            if (fileno == -1 && PyErr_Occurred())
                goto error;

            if (fstat(fileno, &st) >= 0 && st.st_blksize > 1)
                buffering = st.st_blksize;
        }
#endif
    }
    if (buffering < 0) {
        PyErr_SetString(PyExc_ValueError,
                        "invalid buffering size");
        goto error;
    }

    /* if not buffering, returns the raw file object */
    if (buffering == 0) {
        if (!binary) {
            PyErr_SetString(PyExc_ValueError,
                            "can't have unbuffered text I/O");
            goto error;
        }

        Py_DECREF(modeobj);
        return raw;
    }

    /* wraps into a buffered file */
    {
        PyObject *Buffered_class;

        if (updating)
            Buffered_class = (PyObject *)&PyBufferedRandom_Type;
        else if (writing || appending)
            Buffered_class = (PyObject *)&PyBufferedWriter_Type;
        else if (reading)
            Buffered_class = (PyObject *)&PyBufferedReader_Type;
        else {
            PyErr_Format(PyExc_ValueError,
                         "unknown mode: '%s'", mode);
            goto error;
        }

        buffer = PyObject_CallFunction(Buffered_class, "Oi", raw, buffering);
    }
    Py_CLEAR(raw);
    if (buffer == NULL)
        goto error;


    /* if binary, returns the buffered file */
    if (binary) {
        Py_DECREF(modeobj);
        return buffer;
    }

    /* wraps into a TextIOWrapper */
    wrapper = PyObject_CallFunction((PyObject *)&PyTextIOWrapper_Type,
                                "Osssi",
                                buffer,
                                encoding, errors, newline,
                                line_buffering);
    Py_CLEAR(buffer);
    if (wrapper == NULL)
        goto error;

    if (PyObject_SetAttrString(wrapper, "mode", modeobj) < 0)
        goto error;
    Py_DECREF(modeobj);
    return wrapper;

  error:
    Py_XDECREF(raw);
    Py_XDECREF(modeobj);
    Py_XDECREF(buffer);
    Py_XDECREF(wrapper);
    return NULL;
}

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static int iomodule_clear ( PyObject mod) [static]

Definition at line 616 of file _iomodule.c.

                              {
    _PyIO_State *state = IO_MOD_STATE(mod);
    if (!state->initialized)
        return 0;
    Py_CLEAR(state->os_module);
    if (state->locale_module != NULL)
        Py_CLEAR(state->locale_module);
    Py_CLEAR(state->unsupported_operation);
    return 0;
}

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static void iomodule_free ( PyObject mod) [static]

Definition at line 628 of file _iomodule.c.

                             {
    iomodule_clear(mod);
}

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static int iomodule_traverse ( PyObject mod,
visitproc  visit,
void arg 
) [static]

Definition at line 602 of file _iomodule.c.

                                                             {
    _PyIO_State *state = IO_MOD_STATE(mod);
    if (!state->initialized)
        return 0;
    Py_VISIT(state->os_module);
    if (state->locale_module != NULL) {
        Py_VISIT(state->locale_module);
    }
    Py_VISIT(state->unsupported_operation);
    return 0;
}
PyDoc_STRVAR ( module_doc  ,
"The io module provides the Python interfaces to stream handling. The\n""builtin open function is defined in this module.\n""\n""At the top of the I/O hierarchy is the abstract base class IOBase. It\n""defines the basic interface to a stream.  Note,
however  ,
that there is no\n""seperation between reading and writing to streams;implementations are\n""allowed to throw an IOError if they do not support a given operation.\n""\n""Extending IOBase is RawIOBase which deals simply with the reading and\n""writing of raw bytes to a stream.FileIO subclasses RawIOBase to provide\n""an interface to OS files.\n""\n""BufferedIOBase deals with buffering on a raw byte stream(RawIOBase).Its\n""  subclasses,
BufferedWriter  ,
BufferedReader  ,
and BufferedRWPair buffer\n""streams that are  readable,
writable  ,
and both respectively.\n""BufferedRandom provides a buffered interface to random access\n""streams.BytesIO is a simple stream of in-memory bytes.\n""\n""Another IOBase  subclass,
TextIOBase  ,
deals with the encoding and decoding\n""of streams into text.  TextIOWrapper,
which extends  it,
is a buffered text\n""interface to a buffered raw stream(`BufferedIOBase`).  Finally,
StringIO\n""is a in-memory stream for text.\n""\n""Argument names are not part of the  specification,
and only the arguments\n""of open() are intended to be used as keyword arguments.\n""\n""data:\n""\n""DEFAULT_BUFFER_SIZE\n""\n""An int containing the default buffer size used by the module's buffered\n""I/O classes.open() uses the file's blksize(as obtained by os.stat) if\n""possible.\n  
)
PyDoc_STRVAR ( open_doc  ,
openfile, mode='r', buffering=-1, encoding=None,\n"" errors=None, newline=None, closefd=True) -> file object\n""\n""Open file and return a stream. Raise IOError upon failure.\n""\n""file is either a text or byte string giving the name (and the path\n""if the file isn't in the current working directory) of the file to\n""be opened or an integer file descriptor of the file to be\n""wrapped. (If a file descriptor is given, it is closed when the\n""returned I/O object is closed, unless closefd is set to False.)\n""\n""mode is an optional string that specifies the mode in which the file\n""is opened. It defaults to 'r' which means open for reading in text\n""mode. Other common values are 'w' for writing (truncating the file if\n""it already exists,
and 'a'for appending(which on some Unix systems,\n""means that all writes append to the end of the file regardless of the\n""current seek position).In text  mode,
if encoding is not specified the\n""encoding used is platform dependent.(For reading and writing raw\n""bytes use binary mode and leave encoding unspecified.) The available\n""modes are:\n""\n""  = ======== ===============================================================\n""Character Meaning\n""--------- ---------------------------------------------------------------\n""'r'       open for reading (default)\n""'w'       open for writing,
truncating the file first\n""'a'open for  writing,
appending to the end of the file if it exists\n""'b'binary mode\n""'t'text mode(default)\n""'+'open a disk file for updating(reading and writing)\n""'U'universal newline mode(for backwards compatibility;unneeded\n""for new code)\n""  = ======== ===============================================================\n""\n""The default mode is 'rt' (open for reading text). For binary random\n""access,
the mode 'w+b'opens and truncates the file to 0  bytes,
while\n""'r+b'opens the file without truncation.\n""\n""Python distinguishes between files opened in binary and text  modes,
\n""even when the underlying operating system doesn't.Files opened in\n""binary   modeappending 'b'to the mode argument) return contents as\n""bytes objects without any decoding.In text mode(the default, or when\n""'t'is appended to the mode argument,
the contents of the file are\n""returned as  strings,
the bytes having been first decoded using a\n""platform-dependent encoding or using the specified encoding if given.\n""\n""buffering is an optional integer used to set the buffering policy.\n""Pass 0 to switch buffering   offonly allowed in binary mode,
1 to select\n""line   bufferingonly usable in text mode,
and an  integer,
1 to indicate\n""the size of a fixed-size chunk buffer.When no buffering argument is\n""  given,
the default buffering policy works as follows:\n""\n""*Binary files are buffered in fixed-size chunks;the size of the buffer\n""is chosen using a heuristic trying to determine the underlying device's\n""\"block size\" and falling back on `io.DEFAULT_BUFFER_SIZE`.\n"" On many  systems,
the buffer will typically be 4096 or 8192 bytes long.\n""\n""*\"Interactive\" text files (files for which isatty() returns True)\n"" use line buffering. Other text files use the policy described above\n"" for binary files.\n""\n""encoding is the name of the encoding used to decode or encode the\n""file. This should only be used in text mode. The default encoding is\n""platform  dependent,
but any encoding supported by Python can be\n""passed.See the codecs module for the list of supported encodings.\n""\n""errors is an optional string that specifies how encoding errors are to\n""be handled---this argument should not be used in binary mode.Pass\n""'strict'to raise a ValueError exception if there is an encoding error\n""  the default of None has the same effect,
or pass 'ignore'to ignore\n""errors.(Note that ignoring encoding errors can lead to data loss.)\n""See the documentation for codecs.register for a list of the permitted\n""encoding error strings.\n""\n""newline controls how universal newlines works(it only applies to text\n""mode).It can be  None,
''  ,
'\\n ,
'\\r'  ,
and '\\r\\n'.It works as\n""follows:\n""\n""*On  input,
if newline is  None,
universal newlines mode is\n""enabled.Lines in the input can end in '\\n ,
'\\r'  ,
or '\\r\\n ,
and\n""these are translated into '\\n'before being returned to the\n""caller.If it is ''  ,
universal newline mode is  enabled,
but line\n""endings are returned to the caller untranslated.If it has any of\n""the other legal  values,
input lines are only terminated by the given\n""  string,
and the line ending is returned to the caller untranslated.\n""\n""*On  output,
if newline is  None,
any '\\n'characters written are\n""translated to the system default line  separator,
os.linesep.If\n""newline is ''  ,
no translation takes place.If newline is any of the\n""other legal  values,
any '\\n'characters written are translated to\n""the given string.\n""\n""If closefd is  False,
the underlying file descriptor will be kept open\n""when the file is closed.This does not work when a file name is given\n""and must be True in that case.\n""\n""open() returns a file object whose type depends on the  mode,
and\n""through which the standard file operations such as reading and writing\n""are performed.When   open) is used to open a file in a text mode('w',\n""'r', 'wt', 'rt', etc.,
it returns a TextIOWrapper.When used to open\n""a file in a binary  mode,
the returned class varies:in read binary\n""  mode,
it returns a BufferedReader;in write binary and append binary\n""  modes,
it returns a  BufferedWriter,
and in read/write  mode,
it returns\n""a BufferedRandom.\n""\n""It is also possible to use a string or bytearray as a file for both\n""reading and writing.For strings StringIO can be used like a file\n""opened in a text  mode,
and for bytes a BytesIO can be used like a file\n""opened in a binary mode.\n  
)

Definition at line 655 of file _iomodule.c.

{
    PyObject *m = PyModule_Create(&_PyIO_Module);
    _PyIO_State *state = NULL;
    if (m == NULL)
        return NULL;
    state = IO_MOD_STATE(m);
    state->initialized = 0;

    /* put os in the module state */
    state->os_module = PyImport_ImportModule("os");
    if (state->os_module == NULL)
        goto fail;

#define ADD_TYPE(type, name) \
    if (PyType_Ready(type) < 0) \
        goto fail; \
    Py_INCREF(type); \
    if (PyModule_AddObject(m, name, (PyObject *)type) < 0) {  \
        Py_DECREF(type); \
        goto fail; \
    }

    /* DEFAULT_BUFFER_SIZE */
    if (PyModule_AddIntMacro(m, DEFAULT_BUFFER_SIZE) < 0)
        goto fail;

    /* UnsupportedOperation inherits from ValueError and IOError */
    state->unsupported_operation = PyObject_CallFunction(
        (PyObject *)&PyType_Type, "s(OO){}",
        "UnsupportedOperation", PyExc_ValueError, PyExc_IOError);
    if (state->unsupported_operation == NULL)
        goto fail;
    Py_INCREF(state->unsupported_operation);
    if (PyModule_AddObject(m, "UnsupportedOperation",
                           state->unsupported_operation) < 0)
        goto fail;

    /* BlockingIOError */
    _PyExc_BlockingIOError.tp_base = (PyTypeObject *) PyExc_IOError;
    ADD_TYPE(&_PyExc_BlockingIOError, "BlockingIOError");

    /* Concrete base types of the IO ABCs.
       (the ABCs themselves are declared through inheritance in io.py)
    */
    ADD_TYPE(&PyIOBase_Type, "_IOBase");
    ADD_TYPE(&PyRawIOBase_Type, "_RawIOBase");
    ADD_TYPE(&PyBufferedIOBase_Type, "_BufferedIOBase");
    ADD_TYPE(&PyTextIOBase_Type, "_TextIOBase");

    /* Implementation of concrete IO objects. */
    /* FileIO */
    PyFileIO_Type.tp_base = &PyRawIOBase_Type;
    ADD_TYPE(&PyFileIO_Type, "FileIO");

    /* BytesIO */
    PyBytesIO_Type.tp_base = &PyBufferedIOBase_Type;
    ADD_TYPE(&PyBytesIO_Type, "BytesIO");
    if (PyType_Ready(&_PyBytesIOBuffer_Type) < 0)
        goto fail;

    /* StringIO */
    PyStringIO_Type.tp_base = &PyTextIOBase_Type;
    ADD_TYPE(&PyStringIO_Type, "StringIO");

    /* BufferedReader */
    PyBufferedReader_Type.tp_base = &PyBufferedIOBase_Type;
    ADD_TYPE(&PyBufferedReader_Type, "BufferedReader");

    /* BufferedWriter */
    PyBufferedWriter_Type.tp_base = &PyBufferedIOBase_Type;
    ADD_TYPE(&PyBufferedWriter_Type, "BufferedWriter");

    /* BufferedRWPair */
    PyBufferedRWPair_Type.tp_base = &PyBufferedIOBase_Type;
    ADD_TYPE(&PyBufferedRWPair_Type, "BufferedRWPair");

    /* BufferedRandom */
    PyBufferedRandom_Type.tp_base = &PyBufferedIOBase_Type;
    ADD_TYPE(&PyBufferedRandom_Type, "BufferedRandom");

    /* TextIOWrapper */
    PyTextIOWrapper_Type.tp_base = &PyTextIOBase_Type;
    ADD_TYPE(&PyTextIOWrapper_Type, "TextIOWrapper");

    /* IncrementalNewlineDecoder */
    ADD_TYPE(&PyIncrementalNewlineDecoder_Type, "IncrementalNewlineDecoder");

    /* Interned strings */
    if (!(_PyIO_str_close = PyUnicode_InternFromString("close")))
        goto fail;
    if (!(_PyIO_str_closed = PyUnicode_InternFromString("closed")))
        goto fail;
    if (!(_PyIO_str_decode = PyUnicode_InternFromString("decode")))
        goto fail;
    if (!(_PyIO_str_encode = PyUnicode_InternFromString("encode")))
        goto fail;
    if (!(_PyIO_str_fileno = PyUnicode_InternFromString("fileno")))
        goto fail;
    if (!(_PyIO_str_flush = PyUnicode_InternFromString("flush")))
        goto fail;
    if (!(_PyIO_str_getstate = PyUnicode_InternFromString("getstate")))
        goto fail;
    if (!(_PyIO_str_isatty = PyUnicode_InternFromString("isatty")))
        goto fail;
    if (!(_PyIO_str_newlines = PyUnicode_InternFromString("newlines")))
        goto fail;
    if (!(_PyIO_str_nl = PyUnicode_InternFromString("\n")))
        goto fail;
    if (!(_PyIO_str_read = PyUnicode_InternFromString("read")))
        goto fail;
    if (!(_PyIO_str_read1 = PyUnicode_InternFromString("read1")))
        goto fail;
    if (!(_PyIO_str_readable = PyUnicode_InternFromString("readable")))
        goto fail;
    if (!(_PyIO_str_readinto = PyUnicode_InternFromString("readinto")))
        goto fail;
    if (!(_PyIO_str_readline = PyUnicode_InternFromString("readline")))
        goto fail;
    if (!(_PyIO_str_reset = PyUnicode_InternFromString("reset")))
        goto fail;
    if (!(_PyIO_str_seek = PyUnicode_InternFromString("seek")))
        goto fail;
    if (!(_PyIO_str_seekable = PyUnicode_InternFromString("seekable")))
        goto fail;
    if (!(_PyIO_str_setstate = PyUnicode_InternFromString("setstate")))
        goto fail;
    if (!(_PyIO_str_tell = PyUnicode_InternFromString("tell")))
        goto fail;
    if (!(_PyIO_str_truncate = PyUnicode_InternFromString("truncate")))
        goto fail;
    if (!(_PyIO_str_write = PyUnicode_InternFromString("write")))
        goto fail;
    if (!(_PyIO_str_writable = PyUnicode_InternFromString("writable")))
        goto fail;
    
    if (!(_PyIO_empty_str = PyUnicode_FromStringAndSize(NULL, 0)))
        goto fail;
    if (!(_PyIO_empty_bytes = PyBytes_FromStringAndSize(NULL, 0)))
        goto fail;
    if (!(_PyIO_zero = PyLong_FromLong(0L)))
        goto fail;

    state->initialized = 1;

    return m;

  fail:
    Py_XDECREF(state->os_module);
    Py_XDECREF(state->unsupported_operation);
    Py_DECREF(m);
    return NULL;
}

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Py_off_t PyNumber_AsOff_t ( PyObject item,
PyObject err 
)

Definition at line 534 of file _iomodule.c.

{
    Py_off_t result;
    PyObject *runerr;
    PyObject *value = PyNumber_Index(item);
    if (value == NULL)
        return -1;

    /* We're done if PyLong_AsSsize_t() returns without error. */
    result = PyLong_AsOff_t(value);
    if (result != -1 || !(runerr = PyErr_Occurred()))
        goto finish;

    /* Error handling code -- only manage OverflowError differently */
    if (!PyErr_GivenExceptionMatches(runerr, PyExc_OverflowError))
        goto finish;

    PyErr_Clear();
    /* If no error-handling desired then the default clipping
       is sufficient.
     */
    if (!err) {
        assert(PyLong_Check(value));
        /* Whether or not it is less than or equal to
           zero is determined by the sign of ob_size
        */
        if (_PyLong_Sign(value) < 0)
            result = PY_OFF_T_MIN;
        else
            result = PY_OFF_T_MAX;
    }
    else {
        /* Otherwise replace the error with caller's error object. */
        PyErr_Format(err,
                     "cannot fit '%.200s' into an offset-sized integer",
                     item->ob_type->tp_name);
    }

 finish:
    Py_DECREF(value);
    return result;
}

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Variable Documentation

Definition at line 131 of file _iomodule.c.

Definition at line 51 of file _iomodule.c.

Definition at line 50 of file _iomodule.c.

Definition at line 26 of file _iomodule.c.

Definition at line 27 of file _iomodule.c.

Definition at line 28 of file _iomodule.c.

Definition at line 29 of file _iomodule.c.

Definition at line 30 of file _iomodule.c.

Definition at line 31 of file _iomodule.c.

Definition at line 32 of file _iomodule.c.

Definition at line 33 of file _iomodule.c.

Definition at line 34 of file _iomodule.c.

Definition at line 35 of file _iomodule.c.

Definition at line 36 of file _iomodule.c.

Definition at line 37 of file _iomodule.c.

Definition at line 38 of file _iomodule.c.

Definition at line 39 of file _iomodule.c.

Definition at line 40 of file _iomodule.c.

Definition at line 41 of file _iomodule.c.

Definition at line 42 of file _iomodule.c.

Definition at line 43 of file _iomodule.c.

Definition at line 44 of file _iomodule.c.

Definition at line 45 of file _iomodule.c.

Definition at line 46 of file _iomodule.c.

Definition at line 47 of file _iomodule.c.

Definition at line 48 of file _iomodule.c.

Definition at line 52 of file _iomodule.c.

Initial value:
 {
    {"characters_written", T_PYSSIZET, offsetof(PyBlockingIOErrorObject, written), 0},
    {NULL}  
}

Definition at line 126 of file _iomodule.c.

Initial value:
 {
    {"open", (PyCFunction)io_open, METH_VARARGS|METH_KEYWORDS, open_doc},
    {NULL, NULL}
}

Definition at line 637 of file _iomodule.c.

Definition at line 172 of file _iomodule.c.