mirror of https://github.com/python/cpython
263 lines
9.1 KiB
ReStructuredText
263 lines
9.1 KiB
ReStructuredText
.. highlightlang:: c
|
|
|
|
.. _longobjects:
|
|
|
|
Integer Objects
|
|
---------------
|
|
|
|
.. index:: object: long integer
|
|
object: integer
|
|
|
|
All integers are implemented as "long" integer objects of arbitrary size.
|
|
|
|
.. c:type:: PyLongObject
|
|
|
|
This subtype of :c:type:`PyObject` represents a Python integer object.
|
|
|
|
|
|
.. c:var:: PyTypeObject PyLong_Type
|
|
|
|
This instance of :c:type:`PyTypeObject` represents the Python integer type.
|
|
This is the same object as :class:`int` in the Python layer.
|
|
|
|
|
|
.. c:function:: int PyLong_Check(PyObject *p)
|
|
|
|
Return true if its argument is a :c:type:`PyLongObject` or a subtype of
|
|
:c:type:`PyLongObject`.
|
|
|
|
|
|
.. c:function:: int PyLong_CheckExact(PyObject *p)
|
|
|
|
Return true if its argument is a :c:type:`PyLongObject`, but not a subtype of
|
|
:c:type:`PyLongObject`.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromLong(long v)
|
|
|
|
Return a new :c:type:`PyLongObject` object from *v*, or *NULL* on failure.
|
|
|
|
The current implementation keeps an array of integer objects for all integers
|
|
between ``-5`` and ``256``, when you create an int in that range you actually
|
|
just get back a reference to the existing object. So it should be possible to
|
|
change the value of ``1``. I suspect the behaviour of Python in this case is
|
|
undefined. :-)
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromUnsignedLong(unsigned long v)
|
|
|
|
Return a new :c:type:`PyLongObject` object from a C :c:type:`unsigned long`, or
|
|
*NULL* on failure.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromSsize_t(Py_ssize_t v)
|
|
|
|
Return a new :c:type:`PyLongObject` object from a C :c:type:`Py_ssize_t`, or
|
|
*NULL* on failure.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromSize_t(size_t v)
|
|
|
|
Return a new :c:type:`PyLongObject` object from a C :c:type:`size_t`, or
|
|
*NULL* on failure.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromLongLong(long long v)
|
|
|
|
Return a new :c:type:`PyLongObject` object from a C :c:type:`long long`, or *NULL*
|
|
on failure.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromUnsignedLongLong(unsigned long long v)
|
|
|
|
Return a new :c:type:`PyLongObject` object from a C :c:type:`unsigned long long`,
|
|
or *NULL* on failure.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromDouble(double v)
|
|
|
|
Return a new :c:type:`PyLongObject` object from the integer part of *v*, or
|
|
*NULL* on failure.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromString(const char *str, char **pend, int base)
|
|
|
|
Return a new :c:type:`PyLongObject` based on the string value in *str*, which
|
|
is interpreted according to the radix in *base*. If *pend* is non-*NULL*,
|
|
*\*pend* will point to the first character in *str* which follows the
|
|
representation of the number. If *base* is ``0``, the radix will be
|
|
determined based on the leading characters of *str*: if *str* starts with
|
|
``'0x'`` or ``'0X'``, radix 16 will be used; if *str* starts with ``'0o'`` or
|
|
``'0O'``, radix 8 will be used; if *str* starts with ``'0b'`` or ``'0B'``,
|
|
radix 2 will be used; otherwise radix 10 will be used. If *base* is not
|
|
``0``, it must be between ``2`` and ``36``, inclusive. Leading spaces are
|
|
ignored. If there are no digits, :exc:`ValueError` will be raised.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromUnicode(Py_UNICODE *u, Py_ssize_t length, int base)
|
|
|
|
Convert a sequence of Unicode digits to a Python integer value. The Unicode
|
|
string is first encoded to a byte string using :c:func:`PyUnicode_EncodeDecimal`
|
|
and then converted using :c:func:`PyLong_FromString`.
|
|
|
|
.. deprecated-removed:: 3.3 4.0
|
|
Part of the old-style :c:type:`Py_UNICODE` API; please migrate to using
|
|
:c:func:`PyLong_FromUnicodeObject`.
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromUnicodeObject(PyObject *u, int base)
|
|
|
|
Convert a sequence of Unicode digits in the string *u* to a Python integer
|
|
value. The Unicode string is first encoded to a byte string using
|
|
:c:func:`PyUnicode_EncodeDecimal` and then converted using
|
|
:c:func:`PyLong_FromString`.
|
|
|
|
.. versionadded:: 3.3
|
|
|
|
|
|
.. c:function:: PyObject* PyLong_FromVoidPtr(void *p)
|
|
|
|
Create a Python integer from the pointer *p*. The pointer value can be
|
|
retrieved from the resulting value using :c:func:`PyLong_AsVoidPtr`.
|
|
|
|
|
|
.. XXX alias PyLong_AS_LONG (for now)
|
|
.. c:function:: long PyLong_AsLong(PyObject *obj)
|
|
|
|
.. index::
|
|
single: LONG_MAX
|
|
single: OverflowError (built-in exception)
|
|
|
|
Return a C :c:type:`long` representation of *obj*. If *obj* is not an
|
|
instance of :c:type:`PyLongObject`, first call its :meth:`__int__` method
|
|
(if present) to convert it to a :c:type:`PyLongObject`.
|
|
|
|
Raise :exc:`OverflowError` if the value of *obj* is out of range for a
|
|
:c:type:`long`.
|
|
|
|
|
|
.. c:function:: long PyLong_AsLongAndOverflow(PyObject *obj, int *overflow)
|
|
|
|
Return a C :c:type:`long` representation of *obj*. If *obj* is not an
|
|
instance of :c:type:`PyLongObject`, first call its :meth:`__int__` method
|
|
(if present) to convert it to a :c:type:`PyLongObject`.
|
|
|
|
If the value of *obj* is greater than :const:`LONG_MAX` or less than
|
|
:const:`LONG_MIN`, set *\*overflow* to ``1`` or ``-1``, respectively, and
|
|
return ``-1``; otherwise, set *\*overflow* to ``0``. If any other exception
|
|
occurs set *\*overflow* to ``0`` and return ``-1`` as usual.
|
|
|
|
|
|
.. c:function:: long long PyLong_AsLongLong(PyObject *obj)
|
|
|
|
.. index::
|
|
single: OverflowError (built-in exception)
|
|
|
|
Return a C :c:type:`long long` representation of *obj*. If *obj* is not an
|
|
instance of :c:type:`PyLongObject`, first call its :meth:`__int__` method
|
|
(if present) to convert it to a :c:type:`PyLongObject`.
|
|
|
|
Raise :exc:`OverflowError` if the value of *obj* is out of range for a
|
|
:c:type:`long`.
|
|
|
|
|
|
.. c:function:: long long PyLong_AsLongLongAndOverflow(PyObject *obj, int *overflow)
|
|
|
|
Return a C :c:type:`long long` representation of *obj*. If *obj* is not an
|
|
instance of :c:type:`PyLongObject`, first call its :meth:`__int__` method
|
|
(if present) to convert it to a :c:type:`PyLongObject`.
|
|
|
|
If the value of *obj* is greater than :const:`PY_LLONG_MAX` or less than
|
|
:const:`PY_LLONG_MIN`, set *\*overflow* to ``1`` or ``-1``, respectively,
|
|
and return ``-1``; otherwise, set *\*overflow* to ``0``. If any other
|
|
exception occurs set *\*overflow* to ``0`` and return ``-1`` as usual.
|
|
|
|
.. versionadded:: 3.2
|
|
|
|
|
|
.. c:function:: Py_ssize_t PyLong_AsSsize_t(PyObject *pylong)
|
|
|
|
.. index::
|
|
single: PY_SSIZE_T_MAX
|
|
single: OverflowError (built-in exception)
|
|
|
|
Return a C :c:type:`Py_ssize_t` representation of *pylong*. *pylong* must
|
|
be an instance of :c:type:`PyLongObject`.
|
|
|
|
Raise :exc:`OverflowError` if the value of *pylong* is out of range for a
|
|
:c:type:`Py_ssize_t`.
|
|
|
|
|
|
.. c:function:: unsigned long PyLong_AsUnsignedLong(PyObject *pylong)
|
|
|
|
.. index::
|
|
single: ULONG_MAX
|
|
single: OverflowError (built-in exception)
|
|
|
|
Return a C :c:type:`unsigned long` representation of *pylong*. *pylong*
|
|
must be an instance of :c:type:`PyLongObject`.
|
|
|
|
Raise :exc:`OverflowError` if the value of *pylong* is out of range for a
|
|
:c:type:`unsigned long`.
|
|
|
|
|
|
.. c:function:: size_t PyLong_AsSize_t(PyObject *pylong)
|
|
|
|
Return a C :c:type:`size_t` representation of *pylong*. *pylong* must be
|
|
an instance of :c:type:`PyLongObject`.
|
|
|
|
Raise :exc:`OverflowError` if the value of *pylong* is out of range for a
|
|
:c:type:`size_t`.
|
|
|
|
|
|
.. c:function:: unsigned long long PyLong_AsUnsignedLongLong(PyObject *pylong)
|
|
|
|
.. index::
|
|
single: OverflowError (built-in exception)
|
|
|
|
Return a C :c:type:`unsigned long long` representation of *pylong*. *pylong*
|
|
must be an instance of :c:type:`PyLongObject`.
|
|
|
|
Raise :exc:`OverflowError` if the value of *pylong* is out of range for an
|
|
:c:type:`unsigned long long`.
|
|
|
|
.. versionchanged:: 3.1
|
|
A negative *pylong* now raises :exc:`OverflowError`, not :exc:`TypeError`.
|
|
|
|
|
|
.. c:function:: unsigned long PyLong_AsUnsignedLongMask(PyObject *obj)
|
|
|
|
Return a C :c:type:`unsigned long` representation of *obj*. If *obj*
|
|
is not an instance of :c:type:`PyLongObject`, first call its :meth:`__int__`
|
|
method (if present) to convert it to a :c:type:`PyLongObject`.
|
|
|
|
If the value of *obj* is out of range for an :c:type:`unsigned long`,
|
|
return the reduction of that value modulo ``ULONG_MAX + 1``.
|
|
|
|
|
|
.. c:function:: unsigned long long PyLong_AsUnsignedLongLongMask(PyObject *obj)
|
|
|
|
Return a C :c:type:`unsigned long long` representation of *obj*. If *obj*
|
|
is not an instance of :c:type:`PyLongObject`, first call its :meth:`__int__`
|
|
method (if present) to convert it to a :c:type:`PyLongObject`.
|
|
|
|
If the value of *obj* is out of range for an :c:type:`unsigned long long`,
|
|
return the reduction of that value modulo ``PY_ULLONG_MAX + 1``.
|
|
|
|
|
|
.. c:function:: double PyLong_AsDouble(PyObject *pylong)
|
|
|
|
Return a C :c:type:`double` representation of *pylong*. *pylong* must be
|
|
an instance of :c:type:`PyLongObject`.
|
|
|
|
Raise :exc:`OverflowError` if the value of *pylong* is out of range for a
|
|
:c:type:`double`.
|
|
|
|
|
|
.. c:function:: void* PyLong_AsVoidPtr(PyObject *pylong)
|
|
|
|
Convert a Python integer *pylong* to a C :c:type:`void` pointer.
|
|
If *pylong* cannot be converted, an :exc:`OverflowError` will be raised. This
|
|
is only assured to produce a usable :c:type:`void` pointer for values created
|
|
with :c:func:`PyLong_FromVoidPtr`.
|