# Floating Point Objects

type PyFloatObject

  This subtype of `PyObject` represents a Python floating point object.

PyTypeObject PyFloat_Type
  Part of the 안정 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)

  인자가 `PyFloatObject` 나 `PyFloatObject`의 서브 형이면 참을 반환합니다. 이 함수는 항상 성공합니다.

int PyFloat_CheckExact(PyObject *p)

  인자가 `PyFloatObject`이지만 `PyFloatObject`의 서브 형은 아니면 참을 반환합니다. 이 함수는 항상 성공합니다.

PyObject *PyFloat_FromString(PyObject *str)
  반환값: 새 참조. Part of the 안정 ABI.

  str의 문자열 값을 기반으로 `PyFloatObject` 객체를 만들거나, 실패하면 `NULL`.

PyObject *PyFloat_FromDouble(double v)
  반환값: 새 참조. Part of the 안정 ABI.

  v로부터 `PyFloatObject` 객체를 만들거나, 실패하면 `NULL`.

double PyFloat_AsDouble(PyObject *pyfloat)
  Part of the 안정 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.

  버전 3.8에서 변경: 사용할 수 있으면 `__index__()`를 사용합니다.

double PyFloat_AS_DOUBLE(PyObject *pyfloat)

  에러 검사 없이 pyfloat 의 내용의 C double 표현을 반환합니다.

PyObject *PyFloat_GetInfo(void)
  반환값: 새 참조. Part of the 안정 ABI.

  float의 정밀도, 최솟값, 최댓값에 관한 정보를 포함한 structseq 인스턴스를 돌려줍니다. 헤더 파일 `float.h`를 감싸는 얇은 래퍼입니다.

double PyFloat_GetMax()
  Part of the 안정 ABI.

  최대 표현 가능한 유한 float DBL_MAX를 C double로 반환합니다.

double PyFloat_GetMin()
  Part of the 안정 ABI.

  최소 정규화된(normalized) 양의 float DBL_MIN를 C double로 반환합니다.

## Pack and Unpack functions

The pack and unpack functions provide an efficient platform-independent way to store floating-point values as byte strings. The Pack routines produce a bytes string from a C double, and the Unpack routines produce a C double from such a bytes string. The suffix (2, 4 or 8) specifies the number of bytes in the bytes string.

On platforms that appear to use IEEE 754 formats these functions work by copying bits. On other platforms, the 2-byte format is identical to the IEEE 754 binary16 half-precision format, the 4-byte format (32-bit) is identical to the IEEE 754 binary32 single precision format, and the 8-byte format to the IEEE 754 binary64 double precision format, although the packing of INFs and NaNs (if such things exist on the platform) isn’t handled correctly, and attempting to unpack a bytes string containing an IEEE INF or NaN will raise an exception.

On non-IEEE platforms with more precision, or larger dynamic range, than IEEE 754 supports, not all values can be packed; on non-IEEE platforms with less precision, or smaller dynamic range, not all values can be unpacked. What happens in such cases is partly accidental (alas).

버전 3.11에 추가.

### Pack functions

The pack routines write 2, 4 or 8 bytes, starting at p. le is an int argument, non-zero if you want the bytes string in little-endian format (exponent last, at `p+1`, `p+3`, or `p+6` `p+7`), zero if you want big-endian format (exponent first, at p). The `PY_BIG_ENDIAN` constant can be used to use the native endian: it is equal to `1` on big endian processor, or `0` on little endian processor.

Return value: `0` if all is OK, `-1` if error (and an exception is set, most likely `OverflowError`).

There are two problems on non-IEEE platforms:

- What this does is undefined if x is a NaN or infinity.

- `-0.0` and `+0.0` produce the same bytes string.

int PyFloat_Pack2(double x, unsigned char *p, int le)

  Pack a C double as the IEEE 754 binary16 half-precision format.

int PyFloat_Pack4(double x, unsigned char *p, int le)

  Pack a C double as the IEEE 754 binary32 single precision format.

int PyFloat_Pack8(double x, unsigned char *p, int le)

  Pack a C double as the IEEE 754 binary64 double precision format.

### Unpack functions

The unpack routines read 2, 4 or 8 bytes, starting at p. le is an int argument, non-zero if the bytes string is in little-endian format (exponent last, at `p+1`, `p+3` or `p+6` and `p+7`), zero if big-endian (exponent first, at p). The `PY_BIG_ENDIAN` constant can be used to use the native endian: it is equal to `1` on big endian processor, or `0` on little endian processor.

Return value: The unpacked double. On error, this is `-1.0` and `PyErr_Occurred()` is true (and an exception is set, most likely `OverflowError`).

Note that on a non-IEEE platform this will refuse to unpack a bytes string that represents a NaN or infinity.

double PyFloat_Unpack2(const unsigned char *p, int le)

  Unpack the IEEE 754 binary16 half-precision format as a C double.

double PyFloat_Unpack4(const unsigned char *p, int le)

  Unpack the IEEE 754 binary32 single precision format as a C double.

double PyFloat_Unpack8(const unsigned char *p, int le)

  Unpack the IEEE 754 binary64 double precision format as a C double.