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 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.

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: Part of the old-style Py_UNICODE API; please migrate to using 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 long 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.

Raise OverflowError if the value of obj is out of range for a long long.

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 long 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 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 unsigned long representation of pylong. pylong must be an instance of PyLongObject.

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

Returns (unsigned long)-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 unsigned long long representation of pylong. pylong must be an instance of PyLongObject.

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

Returns (unsigned long long)-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 unsigned 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 out of range for an unsigned long, return the reduction of that value modulo ULONG_MAX + 1.

Returns (unsigned long)-1 on error. Use PyErr_Occurred() to disambiguate.

unsigned long long PyLong_AsUnsignedLongLongMask(PyObject *obj)

Return a C unsigned long 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 out of range for an unsigned long long, return the reduction of that value modulo PY_ULLONG_MAX + 1.

Returns (unsigned long long)-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.