Plain Integer Objects
*********************

PyIntObject

   This subtype of "PyObject" represents a Python integer object.

PyTypeObject PyInt_Type

   This instance of "PyTypeObject" represents the Python plain integer
   type. This is the same object as "int" and "types.IntType".

int PyInt_Check(PyObject *o)

   Return true if *o* is of type "PyInt_Type" or a subtype of
   "PyInt_Type".

   在 2.2 版更改: Allowed subtypes to be accepted.

int PyInt_CheckExact(PyObject *o)

   Return true if *o* is of type "PyInt_Type", but not a subtype of
   "PyInt_Type".

   2.2 新版功能.

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

   Return a new "PyIntObject" or "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.  If the string
   represents a number too large to be contained within the machine’s
   "long int" type and overflow warnings are being suppressed, a
   "PyLongObject" will be returned.  If overflow warnings are not
   being suppressed, *NULL* will be returned in this case.

PyObject* PyInt_FromLong(long ival)
    *Return value: New reference.*

   Create a new integer object with a value of *ival*.

   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* PyInt_FromSsize_t(Py_ssize_t ival)
    *Return value: New reference.*

   Create a new integer object with a value of *ival*. If the value is
   larger than "LONG_MAX" or smaller than "LONG_MIN", a long integer
   object is returned.

   2.5 新版功能.

PyObject* PyInt_FromSize_t(size_t ival)

   Create a new integer object with a value of *ival*. If the value
   exceeds "LONG_MAX", a long integer object is returned.

   2.5 新版功能.

long PyInt_AsLong(PyObject *io)

   Will first attempt to cast the object to a "PyIntObject", if it is
   not already one, and then return its value. If there is an error,
   "-1" is returned, and the caller should check "PyErr_Occurred()" to
   find out whether there was an error, or whether the value just
   happened to be "-1".

long PyInt_AS_LONG(PyObject *io)

   Return the value of the object *io*.  No error checking is
   performed.

unsigned long PyInt_AsUnsignedLongMask(PyObject *io)

   Will first attempt to cast the object to a "PyIntObject" or
   "PyLongObject", if it is not already one, and then return its value
   as unsigned long.  This function does not check for overflow.

   2.3 新版功能.

unsigned PY_LONG_LONG PyInt_AsUnsignedLongLongMask(PyObject *io)

   Will first attempt to cast the object to a "PyIntObject" or
   "PyLongObject", if it is not already one, and then return its value
   as unsigned long long, without checking for overflow.

   2.3 新版功能.

Py_ssize_t PyInt_AsSsize_t(PyObject *io)

   Will first attempt to cast the object to a "PyIntObject" or
   "PyLongObject", if it is not already one, and then return its value
   as "Py_ssize_t".

   2.5 新版功能.

long PyInt_GetMax()

   Return the system’s idea of the largest integer it can handle
   ("LONG_MAX", as defined in the system header files).

int PyInt_ClearFreeList()

   Clear the integer free list. Return the number of items that could
   not be freed.

   2.6 新版功能.
