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250 lines
7.7 KiB
ReStructuredText
250 lines
7.7 KiB
ReStructuredText
.. 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:: 2.6
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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:: 2.6
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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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.. versionchanged:: 2.5
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This function used an :ctype:`int` for *length*. This might require
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changes in your code for properly supporting 64-bit systems.
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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:: long PyLong_AsLongAndOverflow(PyObject *pylong, int *overflow)
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Return a C :ctype:`long` representation of the contents of
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*pylong*. If *pylong* is greater than :const:`LONG_MAX` or less
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than :const:`LONG_MIN`, set *\*overflow* to ``1`` or ``-1``,
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respectively, and return ``-1``; otherwise, set *\*overflow* to
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``0``. If any other exception occurs (for example a TypeError or
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MemoryError), then ``-1`` will be returned and *\*overflow* will
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be ``0``.
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.. versionadded:: 2.7
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.. cfunction:: PY_LONG_LONG PyLong_AsLongLongAndOverflow(PyObject *pylong, int *overflow)
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Return a C :ctype:`long long` representation of the contents of
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*pylong*. If *pylong* is greater than :const:`PY_LLONG_MAX` or less
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than :const:`PY_LLONG_MIN`, set *\*overflow* to ``1`` or ``-1``,
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respectively, and return ``-1``; otherwise, set *\*overflow* to
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``0``. If any other exception occurs (for example a TypeError or
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MemoryError), then ``-1`` will be returned and *\*overflow* will
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be ``0``.
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.. versionadded:: 2.7
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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:: 2.6
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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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.. index::
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single: OverflowError (built-in exception)
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Return a C :ctype:`long long` from a Python long integer. If
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*pylong* cannot be represented as a :ctype:`long long`, an
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:exc:`OverflowError` is raised and ``-1`` is returned.
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.. versionadded:: 2.2
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.. cfunction:: unsigned PY_LONG_LONG PyLong_AsUnsignedLongLong(PyObject *pylong)
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.. index::
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single: OverflowError (built-in exception)
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Return a C :ctype:`unsigned long long` from a Python long integer. If
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*pylong* cannot be represented as an :ctype:`unsigned long long`, an
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:exc:`OverflowError` is raised and ``(unsigned long long)-1`` is
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returned.
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.. versionadded:: 2.2
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.. versionchanged:: 2.7
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A negative *pylong* now raises :exc:`OverflowError`, not
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:exc:`TypeError`.
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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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