Complex Numbers as C Structures¶

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. This is consistent throughout the API.

Py_complex
¶

The C structure which corresponds to the value portion of a Python complex number object. Most of the functions for dealing with complex number objects use structures of this type as input or output values, as appropriate. It is defined as:

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

Py_complex
_Py_c_sum
(
Py_complex
 left,
Py_complex
 right
)
¶

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

Py_complex
_Py_c_diff
(
Py_complex
 left,
Py_complex
 right
)
¶

Return the difference between two complex numbers, using the C Py_complex representation.

Py_complex
_Py_c_neg
(
Py_complex
 complex
)
¶

Return the negation of the complex number complex, using the C Py_complex representation.

Py_complex
_Py_c_prod
(
Py_complex
 left,
Py_complex
 right
)
¶

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

Py_complex
_Py_c_quot
(
Py_complex
 dividend,
Py_complex
 divisor
)
¶

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

If divisor is null, this method returns zero and sets errno to EDOM.

Py_complex
_Py_c_pow
(
Py_complex
 num,
Py_complex
 exp
)
¶

Return the exponentiation of num by exp, using the C Py_complex representation.

If num is null and exp is not a positive real number, this method returns zero and sets errno to EDOM.

Complex Numbers as Python Objects¶

PyComplexObject

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¶

This subtype of PyObject represents a Python complex number object.

PyTypeObject
PyComplex_Type
¶

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
)
¶

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

int
PyComplex_CheckExact
(
PyObject
 *p
)
¶

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

PyObject*
PyComplex_FromCComplex
(
Py_complex
 v
)
¶

Return value: New reference.

Create a new Python complex number object from a C Py_complex value.

PyObject*
PyComplex_FromDoubles
(double
 real, double
 imag
)
¶

Return value: New reference.

Return a new PyComplexObject object from real and imag.

double
PyComplex_RealAsDouble
(
PyObject
 *op
)
¶

Return the real part of op as a C double.

double
PyComplex_ImagAsDouble
(
PyObject
 *op
)
¶

Return the imaginary part of op as a C double.

Py_complex
PyComplex_AsCComplex
(
PyObject
 *op
)
¶

Return the Py_complex value of the complex number op.

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 __float__(). If __float__() is not defined then it falls back to __index__(). Upon failure, this method returns -1.0 as a real value.

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