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‎Doc/library/io.rst‎

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@@ -155,16 +155,6 @@ High-level Module Interface
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when an unsupported operation is called on a stream.
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In-memory streams
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^^^^^^^^^^^^^^^^^
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It is also possible to use a :class:`str` or :term:`bytes-like object` as a
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file for both reading and writing. For strings :class:`StringIO` can be used
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like a file opened in text mode. :class:`BytesIO` can be used like a file
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opened in binary mode. Both provide full read-write capabilities with random
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access.
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.. seealso::
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:mod:`sys`

‎Doc/whatsnew/3.10.rst‎

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@@ -215,7 +215,7 @@ operates by:
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match
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5. If an exact match is not confirmed, the last case, a wildcard ``_``,
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if provided, will be used as the matching case. If an exact match is
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not confirmed and a wildcard case does not exists, the entire match
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not confirmed and a wildcard case does not exist, the entire match
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block is a no-op.
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Declarative approach

‎Include/README.rst‎

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The Python C API
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================
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The C API is divided into three sections:
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1. ``Include/``
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2. ``Include/cpython/``
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3. ``Include/internal/``
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Include: Limited API
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====================
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``Include/``, excluding the ``cpython`` and ``internal`` subdirectories,
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contains the public Limited API (Application Programming Interface).
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The Limited API is a subset of the C API, designed to guarantee ABI
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stability across Python 3 versions, and is defined in :pep:`384`.
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Guidelines for expanding the Limited API:
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- Functions *must not* steal references
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- Functions *must not* return borrowed references
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- Functions returning references *must* return a strong reference
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- Macros should not expose implementation details
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- Please start a public discussion before expanding the API
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- Functions or macros with a ``_Py`` prefix do not belong in ``Include/``.
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It is possible to add a function or macro to the Limited API from a
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given Python version. For example, to add a function to the Limited API
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from Python 3.10 and onwards, wrap it with
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``#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000``.
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Include/cpython: CPython implementation details
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===============================================
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``Include/cpython/`` contains the public API that is excluded from the
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Limited API and the Stable ABI.
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Guidelines for expanding the public API:
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- Functions *must not* steal references
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- Functions *must not* return borrowed references
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- Functions returning references *must* return a strong reference
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Include/internal: The internal API
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==================================
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With PyAPI_FUNC or PyAPI_DATA
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-----------------------------
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Functions or structures in ``Include/internal/`` defined with
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``PyAPI_FUNC`` or ``PyAPI_DATA`` are internal functions which are
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exposed only for specific use cases like debuggers and profilers.
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With the extern keyword
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-----------------------
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Functions in ``Include/internal/`` defined with the ``extern`` keyword
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*must not and can not* be used outside the CPython code base. Only
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built-in stdlib extensions (built with the ``Py_BUILD_CORE_BUILTIN``
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macro defined) can use such functions.
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When in doubt, new internal C functions should be defined in
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``Include/internal`` using the ``extern`` keyword.

‎Modules/_collectionsmodule.c‎

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@@ -118,9 +118,23 @@ static PyTypeObject deque_type;
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#define CHECK_NOT_END(link)
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#endif
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/* A simple freelisting scheme is used to minimize calls to the memory
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allocator. It accommodates common use cases where new blocks are being
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added at about the same rate as old blocks are being freed.
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*/
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#define MAXFREEBLOCKS 16
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static Py_ssize_t numfreeblocks = 0;
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static block *freeblocks[MAXFREEBLOCKS];
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static block *
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newblock(void) {
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block *b = PyMem_Malloc(sizeof(block));
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block *b;
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if (numfreeblocks) {
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numfreeblocks--;
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return freeblocks[numfreeblocks];
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}
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b = PyMem_Malloc(sizeof(block));
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if (b != NULL) {
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return b;
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}
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static void
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freeblock(block *b)
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{
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PyMem_Free(b);
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if (numfreeblocks < MAXFREEBLOCKS) {
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freeblocks[numfreeblocks] = b;
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numfreeblocks++;
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} else {
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PyMem_Free(b);
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}
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}
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static PyObject *

‎Python/ceval.c‎

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return 0;
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}
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PyObject* _Py_HOT_FUNCTION
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_PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag)
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{
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_Py_EnsureTstateNotNULL(tstate);
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#ifdef DXPAIRS
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int lastopcode = 0;
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#endif
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PyObject **stack_pointer; /* Next free slot in value stack */
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const _Py_CODEUNIT *next_instr;
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int opcode; /* Current opcode */
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int oparg; /* Current opcode argument, if any */
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PyObject **fastlocals, **freevars;
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PyObject *retval = NULL; /* Return value */
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struct _ceval_state * const ceval2 = &tstate->interp->ceval;
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_Py_atomic_int * const eval_breaker = &ceval2->eval_breaker;
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PyCodeObject *co;
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/* when tracing we set things up so that
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not (instr_lb <= current_bytecode_offset < instr_ub)
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is true when the line being executed has changed. The
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initial values are such as to make this false the first
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time it is tested. */
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const _Py_CODEUNIT *first_instr;
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PyObject *names;
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PyObject *consts;
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_PyOpcache *co_opcache;
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#ifdef LLTRACE
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_Py_IDENTIFIER(__ltrace__);
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#endif
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/* Computed GOTOs, or
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the-optimization-commonly-but-improperly-known-as-"threaded code"
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#endif
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#if USE_COMPUTED_GOTOS
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/* Import the static jump table */
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#include "opcode_targets.h"
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#define TARGET(op) \
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op: \
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TARGET_##op
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#endif
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/* Start of code */
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PyObject* _Py_HOT_FUNCTION
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_PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag)
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{
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_Py_EnsureTstateNotNULL(tstate);
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#if USE_COMPUTED_GOTOS
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/* Import the static jump table */
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#include "opcode_targets.h"
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#endif
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#ifdef DXPAIRS
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int lastopcode = 0;
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#endif
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PyObject **stack_pointer; /* Next free slot in value stack */
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const _Py_CODEUNIT *next_instr;
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int opcode; /* Current opcode */
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int oparg; /* Current opcode argument, if any */
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PyObject **fastlocals, **freevars;
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PyObject *retval = NULL; /* Return value */
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struct _ceval_state * const ceval2 = &tstate->interp->ceval;
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_Py_atomic_int * const eval_breaker = &ceval2->eval_breaker;
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PyCodeObject *co;
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/* when tracing we set things up so that
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not (instr_lb <= current_bytecode_offset < instr_ub)
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is true when the line being executed has changed. The
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initial values are such as to make this false the first
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time it is tested. */
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const _Py_CODEUNIT *first_instr;
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PyObject *names;
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PyObject *consts;
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_PyOpcache *co_opcache;
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#ifdef LLTRACE
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_Py_IDENTIFIER(__ltrace__);
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#endif
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if (_Py_EnterRecursiveCall(tstate, "")) {
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return NULL;

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