author | bugtracker-ml@nttdocomo.com |
Tue, 06 Apr 2010 17:00:22 +0100 | |
changeset 56 | f24810eebc6b |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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.. _setobjects: |
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Set Objects |
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----------- |
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.. sectionauthor:: Raymond D. Hettinger <python@rcn.com> |
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.. index:: |
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object: set |
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object: frozenset |
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.. versionadded:: 2.5 |
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This section details the public API for :class:`set` and :class:`frozenset` |
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objects. Any functionality not listed below is best accessed using the either |
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the abstract object protocol (including :cfunc:`PyObject_CallMethod`, |
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:cfunc:`PyObject_RichCompareBool`, :cfunc:`PyObject_Hash`, |
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:cfunc:`PyObject_Repr`, :cfunc:`PyObject_IsTrue`, :cfunc:`PyObject_Print`, and |
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:cfunc:`PyObject_GetIter`) or the abstract number protocol (including |
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:cfunc:`PyNumber_And`, :cfunc:`PyNumber_Subtract`, :cfunc:`PyNumber_Or`, |
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:cfunc:`PyNumber_Xor`, :cfunc:`PyNumber_InPlaceAnd`, |
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:cfunc:`PyNumber_InPlaceSubtract`, :cfunc:`PyNumber_InPlaceOr`, and |
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:cfunc:`PyNumber_InPlaceXor`). |
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.. ctype:: PySetObject |
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This subtype of :ctype:`PyObject` is used to hold the internal data for both |
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:class:`set` and :class:`frozenset` objects. It is like a :ctype:`PyDictObject` |
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in that it is a fixed size for small sets (much like tuple storage) and will |
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point to a separate, variable sized block of memory for medium and large sized |
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sets (much like list storage). None of the fields of this structure should be |
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considered public and are subject to change. All access should be done through |
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the documented API rather than by manipulating the values in the structure. |
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.. cvar:: PyTypeObject PySet_Type |
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This is an instance of :ctype:`PyTypeObject` representing the Python |
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:class:`set` type. |
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.. cvar:: PyTypeObject PyFrozenSet_Type |
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This is an instance of :ctype:`PyTypeObject` representing the Python |
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:class:`frozenset` type. |
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The following type check macros work on pointers to any Python object. Likewise, |
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the constructor functions work with any iterable Python object. |
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.. cfunction:: int PySet_Check(PyObject *p) |
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Return true if *p* is a :class:`set` object or an instance of a subtype. |
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.. versionadded:: 2.6 |
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.. cfunction:: int PyFrozenSet_Check(PyObject *p) |
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Return true if *p* is a :class:`frozenset` object or an instance of a |
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subtype. |
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.. versionadded:: 2.6 |
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.. cfunction:: int PyAnySet_Check(PyObject *p) |
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Return true if *p* is a :class:`set` object, a :class:`frozenset` object, or an |
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instance of a subtype. |
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.. cfunction:: int PyAnySet_CheckExact(PyObject *p) |
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Return true if *p* is a :class:`set` object or a :class:`frozenset` object but |
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not an instance of a subtype. |
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.. cfunction:: int PyFrozenSet_CheckExact(PyObject *p) |
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Return true if *p* is a :class:`frozenset` object but not an instance of a |
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subtype. |
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.. cfunction:: PyObject* PySet_New(PyObject *iterable) |
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Return a new :class:`set` containing objects returned by the *iterable*. The |
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*iterable* may be *NULL* to create a new empty set. Return the new set on |
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success or *NULL* on failure. Raise :exc:`TypeError` if *iterable* is not |
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actually iterable. The constructor is also useful for copying a set |
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(``c=set(s)``). |
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.. cfunction:: PyObject* PyFrozenSet_New(PyObject *iterable) |
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Return a new :class:`frozenset` containing objects returned by the *iterable*. |
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The *iterable* may be *NULL* to create a new empty frozenset. Return the new |
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set on success or *NULL* on failure. Raise :exc:`TypeError` if *iterable* is |
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not actually iterable. |
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.. versionchanged:: 2.6 |
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Now guaranteed to return a brand-new :class:`frozenset`. Formerly, |
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frozensets of zero-length were a singleton. This got in the way of |
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building-up new frozensets with :meth:`PySet_Add`. |
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The following functions and macros are available for instances of :class:`set` |
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or :class:`frozenset` or instances of their subtypes. |
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.. cfunction:: Py_ssize_t PySet_Size(PyObject *anyset) |
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.. index:: builtin: len |
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Return the length of a :class:`set` or :class:`frozenset` object. Equivalent to |
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``len(anyset)``. Raises a :exc:`PyExc_SystemError` if *anyset* is not a |
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:class:`set`, :class:`frozenset`, or an instance of a subtype. |
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.. cfunction:: Py_ssize_t PySet_GET_SIZE(PyObject *anyset) |
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Macro form of :cfunc:`PySet_Size` without error checking. |
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.. cfunction:: int PySet_Contains(PyObject *anyset, PyObject *key) |
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Return 1 if found, 0 if not found, and -1 if an error is encountered. Unlike |
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the Python :meth:`__contains__` method, this function does not automatically |
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convert unhashable sets into temporary frozensets. Raise a :exc:`TypeError` if |
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the *key* is unhashable. Raise :exc:`PyExc_SystemError` if *anyset* is not a |
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:class:`set`, :class:`frozenset`, or an instance of a subtype. |
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.. cfunction:: int PySet_Add(PyObject *set, PyObject *key) |
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Add *key* to a :class:`set` instance. Does not apply to :class:`frozenset` |
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instances. Return 0 on success or -1 on failure. Raise a :exc:`TypeError` if |
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the *key* is unhashable. Raise a :exc:`MemoryError` if there is no room to grow. |
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Raise a :exc:`SystemError` if *set* is an not an instance of :class:`set` or its |
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subtype. |
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.. versionchanged:: 2.6 |
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Now works with instances of :class:`frozenset` or its subtypes. |
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Like :cfunc:`PyTuple_SetItem` in that it can be used to fill-in the |
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values of brand new frozensets before they are exposed to other code. |
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The following functions are available for instances of :class:`set` or its |
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subtypes but not for instances of :class:`frozenset` or its subtypes. |
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.. cfunction:: int PySet_Discard(PyObject *set, PyObject *key) |
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Return 1 if found and removed, 0 if not found (no action taken), and -1 if an |
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error is encountered. Does not raise :exc:`KeyError` for missing keys. Raise a |
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:exc:`TypeError` if the *key* is unhashable. Unlike the Python :meth:`discard` |
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method, this function does not automatically convert unhashable sets into |
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temporary frozensets. Raise :exc:`PyExc_SystemError` if *set* is an not an |
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instance of :class:`set` or its subtype. |
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.. cfunction:: PyObject* PySet_Pop(PyObject *set) |
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Return a new reference to an arbitrary object in the *set*, and removes the |
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object from the *set*. Return *NULL* on failure. Raise :exc:`KeyError` if the |
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set is empty. Raise a :exc:`SystemError` if *set* is an not an instance of |
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:class:`set` or its subtype. |
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.. cfunction:: int PySet_Clear(PyObject *set) |
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Empty an existing set of all elements. |