浮點數（Floating Point）物件

PyFloatObject

This subtype of PyObject represents a Python floating point object.

PyTypeObject PyFloat_Type

This instance of PyTypeObject represents the Python floating point type. This is the same object as float in the Python layer.

int PyFloat_Check(PyObject *p)

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

int PyFloat_CheckExact(PyObject *p)

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

PyObject* PyFloat_FromString(PyObject *str)

Return value: New reference.

Create a PyFloatObject object based on the string value in str, or NULL on failure.

PyObject* PyFloat_FromDouble(double v)

Return value: New reference.

Create a PyFloatObject object from v, or NULL on failure.

double PyFloat_AsDouble(PyObject *pyfloat)

返回一个 C double 代表 pyfloat 的内容。 如果 pyfloat 不是一个 Python 浮点数对象但是具有 __float__() 方法，此方法将首先被调用，将 pyfloat 转换成一个数点数。 如果 __float__() 未定义则将回退至 __index__()。 如果失败，此方法将返回 -1.0，因此开发者应当调用 PyErr_Occurred() 来检查错误。

3.8 版更變: 如果可用将使用 __index__()。

double PyFloat_AS_DOUBLE(PyObject *pyfloat)

Return a C double representation of the contents of pyfloat, but without error checking.

PyObject* PyFloat_GetInfo(void)

Return value: New reference.

Return a structseq instance which contains information about the precision, minimum and maximum values of a float. It's a thin wrapper around the header file float.h.

double PyFloat_GetMax()

Return the maximum representable finite float DBL_MAX as C double.

double PyFloat_GetMin()

Return the minimum normalized positive float DBL_MIN as C double.

int PyFloat_ClearFreeList()

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