# 7.2.3 Long Integer Objects

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7.2.3 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 `types.LongType`.

int `PyLong_Check`( | PyObject *p)

  Returns 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)

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

PyObject* `PyLong_FromUnsignedLong`( | unsigned long v)

  Return value: New reference.
  Returns a new `PyLongObject` object from a C `unsigned long`, or `NULL` on failure.

PyObject* `PyLong_FromLongLong`( | long long v)

  Return value: New reference.
  Returns a new `PyLongObject` object from a C `long long`, or `NULL` on failure.

PyObject* `PyLong_FromUnsignedLongLong`( | unsigned long long v)

  Return value: New reference.
  Returns a new `PyLongObject` object from a C `unsigned long long`, or `NULL` on failure.

PyObject* `PyLong_FromDouble`( | double v)

  Return value: New reference.
  Returns 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, int 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.

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.

long `PyLong_AsLong`( | PyObject *pylong)

  Returns a C `long` representation of the contents of pylong. If pylong is greater than `LONG_MAX`, an `OverflowError` is raised.

unsigned long `PyLong_AsUnsignedLong`( | PyObject *pylong)

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

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` will be raised. New in version 2.2.

unsigned 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` will be raised if the value is positive, or a `TypeError` will be raised if the value is negative. New in version 2.2.

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 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)

  Returns 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.