Цілі об’єкти

Усі цілі числа реалізуються як «довгі» цілі об’єкти довільного розміру.

У разі помилки більшість API PyLong_As* повертають (тип повернення)-1, який неможливо відрізнити від числа. Використовуйте PyErr_Occurred() для усунення неоднозначності.

type PyLongObject

Part of the Limited API (as an opaque struct).

Цей підтип PyObject представляє цілочисельний об’єкт Python.

PyTypeObject PyLong_Type

Part of the Stable ABI.

Цей екземпляр PyTypeObject представляє цілочисельний тип Python. Це той самий об’єкт, що й int на рівні Python.

int PyLong_Check(PyObject *p)

Повертає true, якщо його аргумент є PyLongObject або підтипом PyLongObject. Ця функція завжди успішна.

int PyLong_CheckExact(PyObject *p)

Повертає true, якщо його аргумент є PyLongObject, але не підтипом PyLongObject. Ця функція завжди успішна.

PyObject *PyLong_FromLong(long v)

Return value: New reference. Part of the Stable ABI.

Повертає новий об’єкт PyLongObject з v або NULL у разі помилки.

Поточна реалізація зберігає масив цілих об’єктів для всіх цілих чисел від -5 до 256. Коли ви створюєте int у цьому діапазоні, ви фактично повертаєте посилання на існуючий об’єкт.

PyObject *PyLong_FromUnsignedLong(unsigned long v)

Return value: New reference. Part of the Stable ABI.

Return a new PyLongObject object from a C unsigned long, or NULL on failure.

PyObject *PyLong_FromSsize_t(Py_ssize_t v)

Return value: New reference. Part of the Stable ABI.

Повертає новий об’єкт PyLongObject із C Py_ssize_t або NULL у разі помилки.

PyObject *PyLong_FromSize_t(size_t v)

Return value: New reference. Part of the Stable ABI.

Повертає новий об’єкт PyLongObject із C size_t або NULL у разі помилки.

PyObject *PyLong_FromLongLong(long long v)

Return value: New reference. Part of the Stable ABI.

Return a new PyLongObject object from a C long long, or NULL on failure.

PyObject *PyLong_FromUnsignedLongLong(unsigned long long v)

Return value: New reference. Part of the Stable ABI.

Return a new PyLongObject object from a C unsigned long long, or NULL on failure.

PyObject *PyLong_FromDouble(double v)

Return value: New reference. Part of the Stable ABI.

Повертає новий об’єкт PyLongObject із цілої частини v або NULL у разі помилки.

PyObject *PyLong_FromString(const char *str, char **pend, int base)

Return value: New reference. Part of the Stable ABI.

Return a new PyLongObject based on the string value in str, which is interpreted according to the radix in base, or NULL on failure. If pend is non-NULL, *pend will point to the end of str on success or to the first character that could not be processed on error. If base is 0, str is interpreted using the Цілі літерали definition; in this case, leading zeros in a non-zero decimal number raises a ValueError. If base is not 0, it must be between 2 and 36, inclusive. Leading and trailing whitespace and single underscores after a base specifier and between digits are ignored. If there are no digits or str is not NULL-terminated following the digits and trailing whitespace, ValueError will be raised.

Дивись також

Python methods int.to_bytes() and int.from_bytes() to convert a PyLongObject to/from an array of bytes in base 256. You can call those from C using PyObject_CallMethod().

PyObject *PyLong_FromUnicodeObject(PyObject *u, int base)

Return value: New reference.

Перетворіть послідовність цифр Unicode у рядку u на ціле число Python.

Added in version 3.3.

PyObject *PyLong_FromVoidPtr(void *p)

Return value: New reference. Part of the Stable ABI.

Створіть ціле число Python із покажчика p. Значення вказівника можна отримати з результуючого значення за допомогою PyLong_AsVoidPtr().

PyObject *PyLong_FromNativeBytes(const void *buffer, size_t n_bytes, int flags)

Create a Python integer from the value contained in the first n_bytes of buffer, interpreted as a two’s-complement signed number.

flags are as for PyLong_AsNativeBytes(). Passing -1 will select the native endian that CPython was compiled with and assume that the most-significant bit is a sign bit. Passing Py_ASNATIVEBYTES_UNSIGNED_BUFFER will produce the same result as calling PyLong_FromUnsignedNativeBytes(). Other flags are ignored.

Added in version 3.13.

PyObject *PyLong_FromUnsignedNativeBytes(const void *buffer, size_t n_bytes, int flags)

Create a Python integer from the value contained in the first n_bytes of buffer, interpreted as an unsigned number.

flags are as for PyLong_AsNativeBytes(). Passing -1 will select the native endian that CPython was compiled with and assume that the most-significant bit is not a sign bit. Flags other than endian are ignored.

Added in version 3.13.

long PyLong_AsLong(PyObject *obj)

Part of the Stable ABI.

Return a C long representation of obj. If obj is not an instance of PyLongObject, first call its __index__() method (if present) to convert it to a PyLongObject.

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

Повертає -1 у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Змінено в версії 3.8: Use __index__() if available.

Змінено в версії 3.10: This function will no longer use __int__().

long PyLong_AS_LONG(PyObject *obj)

A soft deprecated alias. Exactly equivalent to the preferred PyLong_AsLong. In particular, it can fail with OverflowError or another exception.

Застаріло починаючи з версії 3.14: The function is soft deprecated.

int PyLong_AsInt(PyObject *obj)

Part of the Stable ABI since version 3.13.

Similar to PyLong_AsLong(), but store the result in a C int instead of a C long.

Added in version 3.13.

long PyLong_AsLongAndOverflow(PyObject *obj, int *overflow)

Part of the Stable ABI.

Return a C long representation of obj. If obj is not an instance of PyLongObject, first call its __index__() 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.

Повертає -1 у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Змінено в версії 3.8: Use __index__() if available.

Змінено в версії 3.10: This function will no longer use __int__().

long long PyLong_AsLongLong(PyObject *obj)

Part of the Stable ABI.

Return a C long long representation of obj. If obj is not an instance of PyLongObject, first call its __index__() method (if present) to convert it to a PyLongObject.

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

Повертає -1 у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Змінено в версії 3.8: Use __index__() if available.

Змінено в версії 3.10: This function will no longer use __int__().

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

Part of the Stable ABI.

Return a C long long representation of obj. If obj is not an instance of PyLongObject, first call its __index__() method (if present) to convert it to a PyLongObject.

If the value of obj is greater than LLONG_MAX or less than 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.

Повертає -1 у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Added in version 3.2.

Змінено в версії 3.8: Use __index__() if available.

Змінено в версії 3.10: This function will no longer use __int__().

Py_ssize_t PyLong_AsSsize_t(PyObject *pylong)

Part of the Stable ABI.

Повертає C Py_ssize_t представлення pylong. pylong має бути екземпляром PyLongObject.

Викликайте OverflowError, якщо значення pylong виходить за межі діапазону для Py_ssize_t.

Повертає -1 у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

unsigned long PyLong_AsUnsignedLong(PyObject *pylong)

Part of the Stable ABI.

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.

У разі помилки повертає (unsigned long)-1. Використовуйте PyErr_Occurred() для усунення неоднозначності.

size_t PyLong_AsSize_t(PyObject *pylong)

Part of the Stable ABI.

Повертає C size_t представлення pylong. pylong має бути екземпляром PyLongObject.

Викликайте OverflowError, якщо значення pylong виходить за межі діапазону для size_t.

Повертає (size_t)-1 у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

unsigned long long PyLong_AsUnsignedLongLong(PyObject *pylong)

Part of the Stable ABI.

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.

У разі помилки повертає (unsigned long long)-1. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Змінено в версії 3.1: Негативний pylong тепер викликає OverflowError, а не TypeError.

unsigned long PyLong_AsUnsignedLongMask(PyObject *obj)

Part of the Stable ABI.

Return a C unsigned long representation of obj. If obj is not an instance of PyLongObject, first call its __index__() 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.

У разі помилки повертає (unsigned long)-1. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Змінено в версії 3.8: Use __index__() if available.

Змінено в версії 3.10: This function will no longer use __int__().

unsigned long long PyLong_AsUnsignedLongLongMask(PyObject *obj)

Part of the Stable ABI.

Return a C unsigned long long representation of obj. If obj is not an instance of PyLongObject, first call its __index__() 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 ULLONG_MAX + 1.

У разі помилки повертає (unsigned long long)-1. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Змінено в версії 3.8: Use __index__() if available.

Змінено в версії 3.10: This function will no longer use __int__().

double PyLong_AsDouble(PyObject *pylong)

Part of the Stable ABI.

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.

Повертає -1.0 у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

void *PyLong_AsVoidPtr(PyObject *pylong)

Part of the Stable ABI.

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().

Повертає NULL у разі помилки. Використовуйте PyErr_Occurred() для усунення неоднозначності.

Py_ssize_t PyLong_AsNativeBytes(PyObject *pylong, void *buffer, Py_ssize_t n_bytes, int flags)

Copy the Python integer value pylong to a native buffer of size n_bytes. The flags can be set to -1 to behave similarly to a C cast, or to values documented below to control the behavior.

Returns -1 with an exception raised on error. This may happen if pylong cannot be interpreted as an integer, or if pylong was negative and the Py_ASNATIVEBYTES_REJECT_NEGATIVE flag was set.

Otherwise, returns the number of bytes required to store the value. If this is equal to or less than n_bytes, the entire value was copied. All n_bytes of the buffer are written: large buffers are padded with zeroes.

If the returned value is greater than than n_bytes, the value was truncated: as many of the lowest bits of the value as could fit are written, and the higher bits are ignored. This matches the typical behavior of a C-style downcast.

Примітка

Overflow is not considered an error. If the returned value is larger than n_bytes, most significant bits were discarded.

0 will never be returned.

Values are always copied as two’s-complement.

Usage example:

int32_t value;
Py_ssize_t bytes = PyLong_AsNativeBytes(pylong, &value, sizeof(value), -1);
if (bytes < 0) {
    // Failed. A Python exception was set with the reason.
    return NULL;
}
else if (bytes <= (Py_ssize_t)sizeof(value)) {
    // Success!
}
else {
    // Overflow occurred, but 'value' contains the truncated
    // lowest bits of pylong.
}

Passing zero to n_bytes will return the size of a buffer that would be large enough to hold the value. This may be larger than technically necessary, but not unreasonably so. If n_bytes=0, buffer may be NULL.

Примітка

Passing n_bytes=0 to this function is not an accurate way to determine the bit length of the value.

To get at the entire Python value of an unknown size, the function can be called twice: first to determine the buffer size, then to fill it:

// Ask how much space we need.
Py_ssize_t expected = PyLong_AsNativeBytes(pylong, NULL, 0, -1);
if (expected < 0) {
    // Failed. A Python exception was set with the reason.
    return NULL;
}
assert(expected != 0);  // Impossible per the API definition.
uint8_t *bignum = malloc(expected);
if (!bignum) {
    PyErr_SetString(PyExc_MemoryError, "bignum malloc failed.");
    return NULL;
}
// Safely get the entire value.
Py_ssize_t bytes = PyLong_AsNativeBytes(pylong, bignum, expected, -1);
if (bytes < 0) {  // Exception has been set.
    free(bignum);
    return NULL;
}
else if (bytes > expected) {  // This should not be possible.
    PyErr_SetString(PyExc_RuntimeError,
        "Unexpected bignum truncation after a size check.");
    free(bignum);
    return NULL;
}
// The expected success given the above pre-check.
// ... use bignum ...
free(bignum);

flags is either -1 (Py_ASNATIVEBYTES_DEFAULTS) to select defaults that behave most like a C cast, or a combination of the other flags in the table below. Note that -1 cannot be combined with other flags.

Currently, -1 corresponds to Py_ASNATIVEBYTES_NATIVE_ENDIAN | Py_ASNATIVEBYTES_UNSIGNED_BUFFER.

Прапор	Значення
Py_ASNATIVEBYTES_DEFAULTS	-1
Py_ASNATIVEBYTES_BIG_ENDIAN	0
Py_ASNATIVEBYTES_LITTLE_ENDIAN	1
Py_ASNATIVEBYTES_NATIVE_ENDIAN	3
Py_ASNATIVEBYTES_UNSIGNED_BUFFER	4
Py_ASNATIVEBYTES_REJECT_NEGATIVE	8
Py_ASNATIVEBYTES_ALLOW_INDEX	16

Specifying Py_ASNATIVEBYTES_NATIVE_ENDIAN will override any other endian flags. Passing 2 is reserved.

By default, sufficient buffer will be requested to include a sign bit. For example, when converting 128 with n_bytes=1, the function will return 2 (or more) in order to store a zero sign bit.

If Py_ASNATIVEBYTES_UNSIGNED_BUFFER is specified, a zero sign bit will be omitted from size calculations. This allows, for example, 128 to fit in a single-byte buffer. If the destination buffer is later treated as signed, a positive input value may become negative. Note that the flag does not affect handling of negative values: for those, space for a sign bit is always requested.

Specifying Py_ASNATIVEBYTES_REJECT_NEGATIVE causes an exception to be set if pylong is negative. Without this flag, negative values will be copied provided there is enough space for at least one sign bit, regardless of whether Py_ASNATIVEBYTES_UNSIGNED_BUFFER was specified.

If Py_ASNATIVEBYTES_ALLOW_INDEX is specified and a non-integer value is passed, its __index__() method will be called first. This may result in Python code executing and other threads being allowed to run, which could cause changes to other objects or values in use. When flags is -1, this option is not set, and non-integer values will raise TypeError.

Примітка

With the default flags (-1, or UNSIGNED_BUFFER without REJECT_NEGATIVE), multiple Python integers can map to a single value without overflow. For example, both 255 and -1 fit a single-byte buffer and set all its bits. This matches typical C cast behavior.

Added in version 3.13.

PyObject *PyLong_GetInfo(void)

Part of the Stable ABI.

On success, return a read only named tuple, that holds information about Python’s internal representation of integers. See sys.int_info for description of individual fields.

On failure, return NULL with an exception set.

Added in version 3.1.

int PyUnstable_Long_IsCompact(const PyLongObject *op)

This is Unstable API. It may change without warning in minor releases.

Return 1 if op is compact, 0 otherwise.

This function makes it possible for performance-critical code to implement a “fast path” for small integers. For compact values use PyUnstable_Long_CompactValue(); for others fall back to a PyLong_As* function or PyLong_AsNativeBytes().

The speedup is expected to be negligible for most users.

Exactly what values are considered compact is an implementation detail and is subject to change.

Added in version 3.12.

Py_ssize_t PyUnstable_Long_CompactValue(const PyLongObject *op)

This is Unstable API. It may change without warning in minor releases.

If op is compact, as determined by PyUnstable_Long_IsCompact(), return its value.

Otherwise, the return value is undefined.

Added in version 3.12.