Python整数型对象

• Z时代
• 2024-01-10
• 分类：综合

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 (返回值类型)-1 ，无法与一般的数字区分开来。请使用 PyErr_Occurred() 来区分。

PyLongObject¶

表示 Python 整数对象的 PyObject 子类型。

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)¶

如果参数是 PyLongObject 或 PyLongObject 的子类型，返回 true 。

int PyLong_CheckExact(PyObject *p)¶

如果参数是 PyLongObject 但不是 PyLongObject 的子类型，返回 true。

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 。

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. :-)

PyObject* PyLong_FromUnsignedLong(unsigned long v)¶

Return value: New reference.

由 C unsignedlong 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 longlong 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 unsignedlonglong 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.

Convert a sequence of Unicode digits to a Python integer value. The Unicode

string is first encoded to a byte string using PyUnicode_EncodeDecimal()

and then converted using PyLong_FromString().

Deprecated since version 3.3, will be removed in version 4.0: 旧的 Py_UNICODE API的一部分;请迁移到使用 PyLong_FromUnicodeObject() 。

PyObject* PyLong_FromUnicodeObject(PyObject *u, int base)¶

Return value: New reference.

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

PyUnicode_EncodeDecimal() and then converted using

PyLong_FromString().

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)¶

Return a C long representation of obj. If obj is not an

instance of PyLongObject, first call its __int__() method

(if present) to convert it to a PyLongObject.

如果 obj 的值溢出了 long 的范围，会抛出 OverflowError。

发生错误时返回 -1 。使用 PyErr_Occurred() 来消歧义。

long PyLong_AsLongAndOverflow(PyObject *obj, int *overflow)¶

Return a C long representation of obj. If obj is not an

instance of PyLongObject, first call its __int__() method

(if present) to convert it to a PyLongObject.

If the value of obj is greater than LONG_MAX or less than

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.

发生错误时返回 -1 。使用 PyErr_Occurred() 来消歧义。

long long PyLong_AsLongLong(PyObject *obj)¶

Return a C longlong representation of obj. If obj is not an

instance of PyLongObject, first call its __int__() method

(if present) to convert it to a PyLongObject.

如果 obj 值超出 longlong ，触发 OverflowError

发生错误时返回 -1 。使用 PyErr_Occurred() 来消歧义。

long long PyLong_AsLongLongAndOverflow(PyObject *obj, int *overflow)¶

Return a C longlong representation of obj. If obj is not an

instance of PyLongObject, first call its __int__() method

(if present) to convert it to a PyLongObject.

If the value of obj is greater than PY_LLONG_MAX or less than

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.

发生错误时返回 -1 。使用 PyErr_Occurred() 来消歧义。

3.2 新版功能.

Py_ssize_t PyLong_AsSsize_t(PyObject *pylong)¶

Return a C Py_ssize_t representation of pylong. pylong must

be an instance of PyLongObject.

Raise OverflowError if the value of pylong is out of range for a

Py_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 unsignedlong representation of pylong. pylong

must be an instance of PyLongObject.

Raise OverflowError if the value of pylong is out of range for a

unsignedlong.

Returns (unsignedlong)-1 on error.

Use PyErr_Occurred() to disambiguate.

size_t PyLong_AsSize_t(PyObject *pylong)¶

Return a C size_t representation of pylong. pylong must be

an instance of PyLongObject.

Raise OverflowError if the value of pylong is out of range for a

size_t.

Returns (size_t)-1 on error.

Use PyErr_Occurred() to disambiguate.

unsigned long long PyLong_AsUnsignedLongLong(PyObject *pylong)¶

Return a C unsignedlonglong representation of pylong. pylong

must be an instance of PyLongObject.

Raise OverflowError if the value of pylong is out of range for an

unsignedlonglong.

Returns (unsignedlonglong)-1 on error.

Use PyErr_Occurred() to disambiguate.

在 3.1 版更改: A negative pylong now raises OverflowError, not TypeError.

unsigned long PyLong_AsUnsignedLongMask(PyObject *obj)¶

Return a C unsignedlong representation of obj. If obj

is not an instance of PyLongObject, first call its __int__()

method (if present) to convert it to a PyLongObject.

If the value of obj is out of range for an unsignedlong,

return the reduction of that value modulo ULONG_MAX+1.

Returns (unsignedlong)-1 on error. Use PyErr_Occurred() to

disambiguate.

unsigned long long PyLong_AsUnsignedLongLongMask(PyObject *obj)¶

Return a C unsignedlonglong representation of obj. If obj

is not an instance of PyLongObject, first call its __int__()

method (if present) to convert it to a PyLongObject.

If the value of obj is out of range for an unsignedlonglong,

return the reduction of that value modulo PY_ULLONG_MAX+1.

Returns (unsignedlonglong)-1 on error. Use PyErr_Occurred()

to disambiguate.

double PyLong_AsDouble(PyObject *pylong)¶

Return a C double representation of pylong. pylong must be

an instance of PyLongObject.

Raise OverflowError if the value of pylong is out of range for a

double.

Returns -1.0 on error. Use PyErr_Occurred() to disambiguate.

void* PyLong_AsVoidPtr(PyObject *pylong)¶

Convert a Python integer pylong to a C void pointer.

If pylong cannot be converted, an OverflowError will be raised. This

is only assured to produce a usable void pointer for values created

with PyLong_FromVoidPtr().

Returns NULL on error. Use PyErr_Occurred() to disambiguate.