author | andy simpson <andrews@symbian.org> |
Fri, 08 Oct 2010 16:52:59 +0100 | |
changeset 119 | 931f2bbaabf7 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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.. _tupleobjects: |
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Tuple Objects |
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------------- |
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.. index:: object: tuple |
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.. ctype:: PyTupleObject |
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This subtype of :ctype:`PyObject` represents a Python tuple object. |
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.. cvar:: PyTypeObject PyTuple_Type |
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.. index:: single: TupleType (in module types) |
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This instance of :ctype:`PyTypeObject` represents the Python tuple type; it is |
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the same object as ``tuple`` and ``types.TupleType`` in the Python layer.. |
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.. cfunction:: int PyTuple_Check(PyObject *p) |
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Return true if *p* is a tuple object or an instance of a subtype of the tuple |
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type. |
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.. versionchanged:: 2.2 |
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Allowed subtypes to be accepted. |
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.. cfunction:: int PyTuple_CheckExact(PyObject *p) |
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Return true if *p* is a tuple object, but not an instance of a subtype of the |
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tuple type. |
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.. versionadded:: 2.2 |
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.. cfunction:: PyObject* PyTuple_New(Py_ssize_t len) |
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Return a new tuple object of size *len*, or *NULL* on failure. |
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.. cfunction:: PyObject* PyTuple_Pack(Py_ssize_t n, ...) |
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Return a new tuple object of size *n*, or *NULL* on failure. The tuple values |
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are initialized to the subsequent *n* C arguments pointing to Python objects. |
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``PyTuple_Pack(2, a, b)`` is equivalent to ``Py_BuildValue("(OO)", a, b)``. |
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.. versionadded:: 2.4 |
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.. cfunction:: Py_ssize_t PyTuple_Size(PyObject *p) |
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Take a pointer to a tuple object, and return the size of that tuple. |
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.. cfunction:: Py_ssize_t PyTuple_GET_SIZE(PyObject *p) |
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Return the size of the tuple *p*, which must be non-*NULL* and point to a tuple; |
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no error checking is performed. |
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.. cfunction:: PyObject* PyTuple_GetItem(PyObject *p, Py_ssize_t pos) |
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Return the object at position *pos* in the tuple pointed to by *p*. If *pos* is |
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out of bounds, return *NULL* and sets an :exc:`IndexError` exception. |
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.. cfunction:: PyObject* PyTuple_GET_ITEM(PyObject *p, Py_ssize_t pos) |
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Like :cfunc:`PyTuple_GetItem`, but does no checking of its arguments. |
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.. cfunction:: PyObject* PyTuple_GetSlice(PyObject *p, Py_ssize_t low, Py_ssize_t high) |
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Take a slice of the tuple pointed to by *p* from *low* to *high* and return it |
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as a new tuple. |
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.. cfunction:: int PyTuple_SetItem(PyObject *p, Py_ssize_t pos, PyObject *o) |
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Insert a reference to object *o* at position *pos* of the tuple pointed to by |
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*p*. Return ``0`` on success. |
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.. note:: |
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This function "steals" a reference to *o*. |
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.. cfunction:: void PyTuple_SET_ITEM(PyObject *p, Py_ssize_t pos, PyObject *o) |
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Like :cfunc:`PyTuple_SetItem`, but does no error checking, and should *only* be |
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used to fill in brand new tuples. |
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.. note:: |
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This function "steals" a reference to *o*. |
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.. cfunction:: int _PyTuple_Resize(PyObject **p, Py_ssize_t newsize) |
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Can be used to resize a tuple. *newsize* will be the new length of the tuple. |
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Because tuples are *supposed* to be immutable, this should only be used if there |
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is only one reference to the object. Do *not* use this if the tuple may already |
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be known to some other part of the code. The tuple will always grow or shrink |
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at the end. Think of this as destroying the old tuple and creating a new one, |
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only more efficiently. Returns ``0`` on success. Client code should never |
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111 |
assume that the resulting value of ``*p`` will be the same as before calling |
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112 |
this function. If the object referenced by ``*p`` is replaced, the original |
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``*p`` is destroyed. On failure, returns ``-1`` and sets ``*p`` to *NULL*, and |
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raises :exc:`MemoryError` or :exc:`SystemError`. |
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115 |
|
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116 |
.. versionchanged:: 2.2 |
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Removed unused third parameter, *last_is_sticky*. |
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118 |
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119 |
|
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.. cfunction:: int PyTuple_ClearFreeList(void) |
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121 |
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Clear the free list. Return the total number of freed items. |
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123 |
|
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124 |
.. versionadded:: 2.6 |