symbian-qemu-0.9.1-12/python-2.6.1/Doc/c-api/long.rst
author bugtracker-ml@nttdocomo.com
Tue, 06 Apr 2010 17:00:22 +0100
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permissions -rw-r--r--
Merge BUG 1296
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.. highlightlang:: c
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.. _longobjects:
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Long Integer Objects
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--------------------
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.. index:: object: long integer
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.. ctype:: PyLongObject
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   This subtype of :ctype:`PyObject` represents a Python long integer object.
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.. cvar:: PyTypeObject PyLong_Type
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   .. index:: single: LongType (in modules types)
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   This instance of :ctype:`PyTypeObject` represents the Python long integer type.
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   This is the same object as ``long`` and ``types.LongType``.
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.. cfunction:: int PyLong_Check(PyObject *p)
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   Return true if its argument is a :ctype:`PyLongObject` or a subtype of
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   :ctype:`PyLongObject`.
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   .. versionchanged:: 2.2
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      Allowed subtypes to be accepted.
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.. cfunction:: int PyLong_CheckExact(PyObject *p)
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   Return true if its argument is a :ctype:`PyLongObject`, but not a subtype of
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   :ctype:`PyLongObject`.
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   .. versionadded:: 2.2
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.. cfunction:: PyObject* PyLong_FromLong(long v)
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   Return a new :ctype:`PyLongObject` object from *v*, or *NULL* on failure.
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.. cfunction:: PyObject* PyLong_FromUnsignedLong(unsigned long v)
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   Return a new :ctype:`PyLongObject` object from a C :ctype:`unsigned long`, or
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   *NULL* on failure.
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.. cfunction:: PyObject* PyLong_FromSsize_t(Py_ssize_t v)
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   Return a new :ctype:`PyLongObject` object from a C :ctype:`Py_ssize_t`, or
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   *NULL* on failure.
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   .. versionadded:: 2.5
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.. cfunction:: PyObject* PyLong_FromSize_t(size_t v)
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   Return a new :ctype:`PyLongObject` object from a C :ctype:`size_t`, or
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   *NULL* on failure.
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   .. versionadded:: 2.5
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.. cfunction:: PyObject* PyLong_FromLongLong(PY_LONG_LONG v)
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   Return a new :ctype:`PyLongObject` object from a C :ctype:`long long`, or *NULL*
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   on failure.
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.. cfunction:: PyObject* PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG v)
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   Return a new :ctype:`PyLongObject` object from a C :ctype:`unsigned long long`,
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   or *NULL* on failure.
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.. cfunction:: PyObject* PyLong_FromDouble(double v)
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   Return a new :ctype:`PyLongObject` object from the integer part of *v*, or
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   *NULL* on failure.
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.. cfunction:: PyObject* PyLong_FromString(char *str, char **pend, int base)
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   Return a new :ctype:`PyLongObject` based on the string value in *str*, which is
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   interpreted according to the radix in *base*.  If *pend* is non-*NULL*,
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   ``*pend`` will point to the first character in *str* which follows the
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   representation of the number.  If *base* is ``0``, the radix will be determined
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   based on the leading characters of *str*: if *str* starts with ``'0x'`` or
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   ``'0X'``, radix 16 will be used; if *str* starts with ``'0'``, radix 8 will be
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   used; otherwise radix 10 will be used.  If *base* is not ``0``, it must be
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   between ``2`` and ``36``, inclusive.  Leading spaces are ignored.  If there are
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   no digits, :exc:`ValueError` will be raised.
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.. cfunction:: PyObject* PyLong_FromUnicode(Py_UNICODE *u, Py_ssize_t length, int base)
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   Convert a sequence of Unicode digits to a Python long integer value.  The first
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   parameter, *u*, points to the first character of the Unicode string, *length*
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   gives the number of characters, and *base* is the radix for the conversion.  The
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   radix must be in the range [2, 36]; if it is out of range, :exc:`ValueError`
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   will be raised.
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   .. versionadded:: 1.6
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.. cfunction:: PyObject* PyLong_FromVoidPtr(void *p)
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   Create a Python integer or long integer from the pointer *p*. The pointer value
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   can be retrieved from the resulting value using :cfunc:`PyLong_AsVoidPtr`.
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   .. versionadded:: 1.5.2
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   .. versionchanged:: 2.5
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      If the integer is larger than LONG_MAX, a positive long integer is returned.
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.. cfunction:: long PyLong_AsLong(PyObject *pylong)
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   .. index::
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      single: LONG_MAX
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      single: OverflowError (built-in exception)
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   Return a C :ctype:`long` representation of the contents of *pylong*.  If
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   *pylong* is greater than :const:`LONG_MAX`, an :exc:`OverflowError` is raised
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   and ``-1`` will be returned. 
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.. cfunction:: Py_ssize_t PyLong_AsSsize_t(PyObject *pylong)
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   .. index::
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      single: PY_SSIZE_T_MAX
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      single: OverflowError (built-in exception)
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   Return a C :ctype:`Py_ssize_t` representation of the contents of *pylong*.  If
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   *pylong* is greater than :const:`PY_SSIZE_T_MAX`, an :exc:`OverflowError` is raised
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   and ``-1`` will be returned.
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   .. versionadded:: 2.5
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.. cfunction:: unsigned long PyLong_AsUnsignedLong(PyObject *pylong)
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   .. index::
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      single: ULONG_MAX
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      single: OverflowError (built-in exception)
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   Return a C :ctype:`unsigned long` representation of the contents of *pylong*.
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   If *pylong* is greater than :const:`ULONG_MAX`, an :exc:`OverflowError` is
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   raised.
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.. cfunction:: PY_LONG_LONG PyLong_AsLongLong(PyObject *pylong)
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   Return a C :ctype:`long long` from a Python long integer.  If *pylong* cannot be
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   represented as a :ctype:`long long`, an :exc:`OverflowError` will be raised.
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   .. versionadded:: 2.2
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.. cfunction:: unsigned PY_LONG_LONG PyLong_AsUnsignedLongLong(PyObject *pylong)
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   Return a C :ctype:`unsigned long long` from a Python long integer. If *pylong*
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   cannot be represented as an :ctype:`unsigned long long`, an :exc:`OverflowError`
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   will be raised if the value is positive, or a :exc:`TypeError` will be raised if
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   the value is negative.
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   .. versionadded:: 2.2
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.. cfunction:: unsigned long PyLong_AsUnsignedLongMask(PyObject *io)
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   Return a C :ctype:`unsigned long` from a Python long integer, without checking
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   for overflow.
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   .. versionadded:: 2.3
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.. cfunction:: unsigned PY_LONG_LONG PyLong_AsUnsignedLongLongMask(PyObject *io)
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   Return a C :ctype:`unsigned long long` from a Python long integer, without
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   checking for overflow.
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   .. versionadded:: 2.3
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.. cfunction:: double PyLong_AsDouble(PyObject *pylong)
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   Return a C :ctype:`double` representation of the contents of *pylong*.  If
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   *pylong* cannot be approximately represented as a :ctype:`double`, an
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   :exc:`OverflowError` exception is raised and ``-1.0`` will be returned.
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.. cfunction:: void* PyLong_AsVoidPtr(PyObject *pylong)
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   Convert a Python integer or long integer *pylong* to a C :ctype:`void` pointer.
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   If *pylong* cannot be converted, an :exc:`OverflowError` will be raised.  This
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   is only assured to produce a usable :ctype:`void` pointer for values created
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   with :cfunc:`PyLong_FromVoidPtr`.
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   .. versionadded:: 1.5.2
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   .. versionchanged:: 2.5
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      For values outside 0..LONG_MAX, both signed and unsigned integers are accepted.
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