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Complex Number Objects — Python 3.15.0a0 documentation

Complex Number ObjectsÂ¶

type PyComplexObjectÂ¶

This subtype of PyObject represents a Python complex number object.

Py_complex cvalÂ¶

The complex number value, using the C Py_complex representation.

Deprecated since version 3.15.0a0 (unreleased), will be removed in version 3.20: Use PyComplex_AsCComplex() and PyComplex_FromCComplex() to convert a Python complex number to/from the C Py_complex representation.

PyTypeObject PyComplex_TypeÂ¶: Part of the Stable ABI.
This instance of PyTypeObject represents the Python complex number type. It is the same object as complex in the Python layer.

int PyComplex_Check(PyObject *p)Â¶: Return true if its argument is a PyComplexObject or a subtype of PyComplexObject. This function always succeeds.

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

PyObject *PyComplex_FromDoubles(double real, double imag)Â¶: Return value: New reference. Part of the Stable ABI.
Return a new PyComplexObject object from real and imag. Return NULL with an exception set on error.

double PyComplex_RealAsDouble(PyObject *op)Â¶

Part of the Stable ABI.

Return the real part of op as a C double.

If op is not a Python complex number object but has a __complex__() method, this method will first be called to convert op to a Python complex number object. If __complex__() is not defined then it falls back to call PyFloat_AsDouble() and returns its result.

Upon failure, this method returns -1.0 with an exception set, so one should call PyErr_Occurred() to check for errors.

Changed in version 3.13: Use __complex__() if available.

double PyComplex_ImagAsDouble(PyObject *op)Â¶

Part of the Stable ABI.

Return the imaginary part of op as a C double.

Upon failure, this method returns -1.0 with an exception set, so one should call PyErr_Occurred() to check for errors.

Changed in version 3.13: Use __complex__() if available.

type Py_complexÂ¶

This C structure defines export format for a Python complex number object.

double realÂ¶
double imagÂ¶

The structure is defined as:

typedef struct {
    double real;
    double imag;
} Py_complex;

PyObject *PyComplex_FromCComplex(Py_complex v)Â¶: Return value: New reference.
Create a new Python complex number object from a C Py_complex value. Return NULL with an exception set on error.

Py_complex PyComplex_AsCComplex(PyObject *op)Â¶

Return the Py_complex value of the complex number op.

Upon failure, this method returns Py_complex with real set to -1.0 and with an exception set, so one should call PyErr_Occurred() to check for errors.

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

Complex Numbers as C StructuresÂ¶

The API also provides functions for working with complex numbers, using the Py_complex representation. Note that the functions which accept these structures as parameters and return them as results do so by value rather than dereferencing them through pointers.

Please note, that these functions are soft deprecated since Python 3.15. Avoid using this API in a new code to do complex arithmetic: either use the Number Protocol API or use native complex types, like double complex.

Py_complex _Py_c_sum(Py_complex left, Py_complex right)Â¶

Return the sum of two complex numbers, using the C Py_complex representation.