# Long Integer Objects¶

PyLongObject

This subtype of PyObject represents a Python long integer object.

PyTypeObject PyLong_Type

This instance of PyTypeObject represents the Python long integer type. This is the same object as long and types.LongType.

int PyLong_Check(PyObject *p)

Return true if its argument is a PyLongObject or a subtype of PyLongObject.

Changed in version 2.2: Allowed subtypes to be accepted.

int PyLong_CheckExact(PyObject *p)

Return true if its argument is a PyLongObject, but not a subtype of PyLongObject.

New in version 2.2.

PyObject* PyLong_FromLong(long v)
Return value: New reference.

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

PyObject* PyLong_FromUnsignedLong(unsigned long v)
Return value: New reference.

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.

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

New in version 2.6.

PyObject* PyLong_FromSize_t(size_t v)
Return value: New reference.

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

New in version 2.6.

PyObject* PyLong_FromLongLong(PY_LONG_LONG v)
Return value: New reference.

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

PyObject* PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG v)
Return value: New reference.

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

PyObject* PyLong_FromDouble(double v)
Return value: New reference.

Return a new PyLongObject object from the integer part of v, or NULL on failure.

PyObject* PyLong_FromString(char *str, char **pend, int base)
Return value: New reference.

Return a new 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 '0', radix 8 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, ValueError will be raised.

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 long integer value. The first parameter, u, points to the first character of the Unicode string, length gives the number of characters, and base is the radix for the conversion. The radix must be in the range [2, 36]; if it is out of range, ValueError will be raised.

New in version 1.6.

Changed in version 2.5: This function used an int for length. This might require changes in your code for properly supporting 64-bit systems.

PyObject* PyLong_FromVoidPtr(void *p)
Return value: New reference.

Create a Python integer or long integer from the pointer p. The pointer value can be retrieved from the resulting value using PyLong_AsVoidPtr().

New in version 1.5.2.

Changed in version 2.5: If the integer is larger than LONG_MAX, a positive long integer is returned.

long PyLong_AsLong(PyObject *pylong)

Return a C long representation of the contents of pylong. If pylong is greater than LONG_MAX, an OverflowError is raised and -1 will be returned.

long PyLong_AsLongAndOverflow(PyObject *pylong, int *overflow)

Return a C long representation of the contents of pylong. If pylong 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 (for example a TypeError or MemoryError), then -1 will be returned and *overflow will be 0.

New in version 2.7.

PY_LONG_LONG PyLong_AsLongLongAndOverflow(PyObject *pylong, int *overflow)

Return a C long long representation of the contents of pylong. If pylong 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 (for example a TypeError or MemoryError), then -1 will be returned and *overflow will be 0.

New in version 2.7.

Py_ssize_t PyLong_AsSsize_t(PyObject *pylong)

Return a C Py_ssize_t representation of the contents of pylong. If pylong is greater than PY_SSIZE_T_MAX, an OverflowError is raised and -1 will be returned.

New in version 2.6.

unsigned long PyLong_AsUnsignedLong(PyObject *pylong)

Return a C unsigned long representation of the contents of pylong. If pylong is greater than ULONG_MAX, an OverflowError is raised.

PY_LONG_LONG PyLong_AsLongLong(PyObject *pylong)

Return a C long long from a Python long integer. If pylong cannot be represented as a long long, an OverflowError is raised and -1 is returned.

New in version 2.2.

unsigned PY_LONG_LONG PyLong_AsUnsignedLongLong(PyObject *pylong)

Return a C unsigned long long from a Python long integer. If pylong cannot be represented as an unsigned long long, an OverflowError is raised and (unsigned long long)-1 is returned.

New in version 2.2.

Changed in version 2.7: A negative pylong now raises OverflowError, not TypeError.

unsigned long PyLong_AsUnsignedLongMask(PyObject *io)

Return a C unsigned long from a Python long integer, without checking for overflow.

New in version 2.3.

unsigned PY_LONG_LONG PyLong_AsUnsignedLongLongMask(PyObject *io)

Return a C unsigned long long from a Python long integer, without checking for overflow.

New in version 2.3.

double PyLong_AsDouble(PyObject *pylong)

Return a C double representation of the contents of pylong. If pylong cannot be approximately represented as a double, an OverflowError exception is raised and -1.0 will be returned.

void* PyLong_AsVoidPtr(PyObject *pylong)

Convert a Python integer or long 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().

New in version 1.5.2.

Changed in version 2.5: For values outside 0..LONG_MAX, both signed and unsigned integers are accepted.