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Floating Point Objects - Python 3.10.9 documentation 编辑

type PyFloatObject: This subtype of PyObject represents a Python floating point object.

PyTypeObject PyFloat_Type: Part of the Stable ABI.
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. This function always succeeds.

int PyFloat_CheckExact(PyObject *p): Return true if its argument is a PyFloatObject, but not a subtype of PyFloatObject. This function always succeeds.

PyObject *PyFloat_FromString(PyObject *str): Return value: New reference. Part of the Stable ABI.
Create a PyFloatObject object based on the string value in str, or NULL on failure.

PyObject *PyFloat_FromDouble(double v): Return value: New reference. Part of the Stable ABI.
Create a PyFloatObject object from v, or NULL on failure.

double PyFloat_AsDouble(PyObject *pyfloat)

Part of the Stable ABI.

Return a C double representation of the contents of pyfloat. If pyfloat is not a Python floating point object but has a __float__() method, this method will first be called to convert pyfloat into a float. If __float__() is not defined then it falls back to __index__(). This method returns -1.0 upon failure, so one should call PyErr_Occurred() to check for errors.

Changed in version 3.8: Use __index__() if available.

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. Part of the Stable ABI.
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.