contents
related file
- cpython/Objects/complexobject.c
- cpython/Include/complexobject.h
- cpython/clinic/complexobject.c.h
memory layout
PyComplexObject stores two double-precision floating-point numbers inside.
The handling process and representation are mostly the same as the float object
example
Let's read the add function
Py_complex _Py_c_sum(Py_complex a, Py_complex b) { Py_complex r; r.real = a.real + b.real; r.imag = a.imag + b.imag; return r; } static PyObject * complex_add(PyObject *v, PyObject *w) { Py_complex result; Py_complex a, b; TO_COMPLEX(v, a); // check the type, covert to complex if type is not complex TO_COMPLEX(w, b); PyFPE_START_PROTECT("complex_add", return 0) // useless after version 3.7 result = _Py_c_sum(a, b); // sum the complex PyFPE_END_PROTECT(result) // useless after version 3.7 return PyComplex_FromCComplex(result); }
The add operation is quite simple: sum the real parts, sum the imag parts, and return the new value.
The sub/divide/pow/neg operations are similar
>>> e = c + d >>> repr(e) '(0.1+0.8j)'
