整数型对象¶
所有整数都使用以任意大小的长整数对象表示。
在出错时,大多数 PyLong_As*
API返回 (返回类型)-1
,无法与一般的数字区分开来。请使用 PyErr_Occurred()
来区分。
-
PyTypeObject
PyLong_Type
¶ 这个
PyTypeObject
的实例表示 Python 的整数类型。与Python层中的int
相同。
-
int
PyLong_Check
(PyObject *p)¶ Return true if its argument is a
PyLongObject
or a subtype ofPyLongObject
. This function always succeeds.
-
int
PyLong_CheckExact
(PyObject *p)¶ Return true if its argument is a
PyLongObject
, but not a subtype ofPyLongObject
. This function always succeeds.
-
PyObject*
PyLong_FromLong
(long v)¶ - Return value: New reference.
由 v 返回一个新的
PyLongObject
对象,失败时返回NULL
。当前的实现维护了一个整数对象数组,包含
-5
和256
之间的所有整数对象。当你在这个范围内创建一个 int 时,实际上得到的是一个对已有对象的引用。
-
PyObject*
PyLong_FromUnsignedLong
(unsigned long v)¶ - Return value: New reference.
由 C
unsigned long
类型返回一个新的PyLongObject
对象,失败时返回NULL
。
-
PyObject*
PyLong_FromSsize_t
(Py_ssize_t v)¶ - Return value: New reference.
从 C
Py_ssize_t
类型返回一个新的PyLongObject
对象,如果失败则返回NULL
。
-
PyObject*
PyLong_FromSize_t
(size_t v)¶ - Return value: New reference.
从 C
size_t
返回一个新的PyLongObject
对象,如果失败则返回NULL
。
-
PyObject*
PyLong_FromLongLong
(long long v)¶ - Return value: New reference.
从 C
long long
返回一个新的PyLongObject
对象,失败时返回NULL
。
-
PyObject*
PyLong_FromUnsignedLongLong
(unsigned long long v)¶ - Return value: New reference.
从 C
unsigned long long
返回一个新的PyLongObject
对象,失败时返回NULL
。
-
PyObject*
PyLong_FromDouble
(double v)¶ - Return value: New reference.
从 v 的整数部分返回一个新的
PyLongObject
对象,如果失败则返回NULL
。
-
PyObject*
PyLong_FromString
(const char *str, char **pend, int base)¶ - Return value: New reference.
根据 str 字符串值返回一个新的
PyLongObject
,base 指定基数。如果 pend 不是NULL
, /*pend 将指向 str 中表示这个数字部分的后面的第一个字符。如果 base 是0
, str 将使用 整型数字面值 定义来解释;在这种情况下,一个非零的十进制数中的前导零会引发一个ValueError
。如果 base 不是0
,它必须在2
和36
之间,包括2和36。基数说明符后以及数字之间的前导空格、单下划线将被忽略。如果没有数字,将引发ValueError
。
-
PyObject*
PyLong_FromUnicode
(Py_UNICODE *u, Py_ssize_t length, int base)¶ - Return value: New reference.
将 Unicode 数字序列转换为 Python 整数值。
Deprecated since version 3.3, will be removed in version 3.10: Part of the old-style
Py_UNICODE
API; please migrate to usingPyLong_FromUnicodeObject()
.
-
PyObject*
PyLong_FromUnicodeObject
(PyObject *u, int base)¶ - Return value: New reference.
将字符串 u 中的 Unicode 数字序列转换为 Python 整数值。
3.3 新版功能.
-
PyObject*
PyLong_FromVoidPtr
(void *p)¶ - Return value: New reference.
从指针 p 创建一个 Python 整数。可以使用
PyLong_AsVoidPtr()
返回的指针值。
-
long
PyLong_AsLong
(PyObject *obj)¶ 返回 obj 的 C
long
表达方式。 如果 obj 不是PyLongObject
的实例,先调用它的__index__()
或__int__()
方法(如果有)将其转换为PyLongObject
。如果 obj 的值溢出了
long
的范围,会引发OverflowError
。发生错误时返回
-1
。使用PyErr_Occurred()
来消歧义。在 3.8 版更改: 如果可用将使用
__index__()
。3.8 版后已移除:
__int__()
已被弃用。
-
long
PyLong_AsLongAndOverflow
(PyObject *obj, int *overflow)¶ 返回 obj 的 C
long
表达方式。 如果 obj 不是PyLongObject
的实例,先调用它的__index__()
或__int__()
方法(如果有)将其转换为PyLongObject
。If the value of obj is greater than
LONG_MAX
or less thanLONG_MIN
, set *overflow to1
or-1
, respectively, and return-1
; otherwise, set *overflow to0
. If any other exception occurs set *overflow to0
and return-1
as usual.发生错误时返回
-1
。使用PyErr_Occurred()
来消歧义。在 3.8 版更改: 如果可用将使用
__index__()
。3.8 版后已移除:
__int__()
已被弃用。
-
long long
PyLong_AsLongLong
(PyObject *obj)¶ Return a C
long long
representation of obj. If obj is not an instance ofPyLongObject
, first call its__index__()
or__int__()
method (if present) to convert it to aPyLongObject
.Raise
OverflowError
if the value of obj is out of range for along long
.发生错误时返回
-1
。使用PyErr_Occurred()
来消歧义。在 3.8 版更改: 如果可用将使用
__index__()
。3.8 版后已移除:
__int__()
已被弃用。
-
long long
PyLong_AsLongLongAndOverflow
(PyObject *obj, int *overflow)¶ Return a C
long long
representation of obj. If obj is not an instance ofPyLongObject
, first call its__index__()
or__int__()
method (if present) to convert it to aPyLongObject
.If the value of obj is greater than
LLONG_MAX
or less thanLLONG_MIN
, set *overflow to1
or-1
, respectively, and return-1
; otherwise, set *overflow to0
. If any other exception occurs set *overflow to0
and return-1
as usual.发生错误时返回
-1
。使用PyErr_Occurred()
来消歧义。3.2 新版功能.
在 3.8 版更改: 如果可用将使用
__index__()
。3.8 版后已移除:
__int__()
已被弃用。
-
Py_ssize_t
PyLong_AsSsize_t
(PyObject *pylong)¶ Return a C
Py_ssize_t
representation of pylong. pylong must be an instance ofPyLongObject
.Raise
OverflowError
if the value of pylong is out of range for aPy_ssize_t
.发生错误时返回
-1
。使用PyErr_Occurred()
来消歧义。
-
unsigned long
PyLong_AsUnsignedLong
(PyObject *pylong)¶ Return a C
unsigned long
representation of pylong. pylong must be an instance ofPyLongObject
.Raise
OverflowError
if the value of pylong is out of range for aunsigned long
.Returns
(unsigned long)-1
on error. UsePyErr_Occurred()
to disambiguate.
-
size_t
PyLong_AsSize_t
(PyObject *pylong)¶ Return a C
size_t
representation of pylong. pylong must be an instance ofPyLongObject
.Raise
OverflowError
if the value of pylong is out of range for asize_t
.Returns
(size_t)-1
on error. UsePyErr_Occurred()
to disambiguate.
-
unsigned long long
PyLong_AsUnsignedLongLong
(PyObject *pylong)¶ Return a C
unsigned long long
representation of pylong. pylong must be an instance ofPyLongObject
.Raise
OverflowError
if the value of pylong is out of range for anunsigned long long
.Returns
(unsigned long long)-1
on error. UsePyErr_Occurred()
to disambiguate.在 3.1 版更改: A negative pylong now raises
OverflowError
, notTypeError
.
-
unsigned long
PyLong_AsUnsignedLongMask
(PyObject *obj)¶ Return a C
unsigned long
representation of obj. If obj is not an instance ofPyLongObject
, first call its__index__()
or__int__()
method (if present) to convert it to aPyLongObject
.If the value of obj is out of range for an
unsigned long
, return the reduction of that value moduloULONG_MAX + 1
.Returns
(unsigned long)-1
on error. UsePyErr_Occurred()
to disambiguate.在 3.8 版更改: 如果可用将使用
__index__()
。3.8 版后已移除:
__int__()
已被弃用。
-
unsigned long long
PyLong_AsUnsignedLongLongMask
(PyObject *obj)¶ Return a C
unsigned long long
representation of obj. If obj is not an instance ofPyLongObject
, first call its__index__()
or__int__()
method (if present) to convert it to aPyLongObject
.If the value of obj is out of range for an
unsigned long long
, return the reduction of that value moduloULLONG_MAX + 1
.Returns
(unsigned long long)-1
on error. UsePyErr_Occurred()
to disambiguate.在 3.8 版更改: 如果可用将使用
__index__()
。3.8 版后已移除:
__int__()
已被弃用。
-
double
PyLong_AsDouble
(PyObject *pylong)¶ Return a C
double
representation of pylong. pylong must be an instance ofPyLongObject
.Raise
OverflowError
if the value of pylong is out of range for adouble
.Returns
-1.0
on error. UsePyErr_Occurred()
to disambiguate.
-
void*
PyLong_AsVoidPtr
(PyObject *pylong)¶ Convert a Python integer pylong to a C
void
pointer. If pylong cannot be converted, anOverflowError
will be raised. This is only assured to produce a usablevoid
pointer for values created withPyLong_FromVoidPtr()
.Returns
NULL
on error. UsePyErr_Occurred()
to disambiguate.