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gh-84978: Add float.from_number() and complex.from_number() (GH-26827)

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They are alternate constructors which only accept numbers
(including objects with special methods __float__, __complex__
and __index__), but not strings.
This commit is contained in:
Serhiy Storchaka 2024-07-15 19:07:00 +03:00 • committed by GitHub
parent 8303d32ff5
commit 94bee45dee
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GPG key ID: B5690EEEBB952194
10 changed files with 242 additions and 46 deletions
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31
Objects/floatobject.c
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@ -1669,6 +1669,36 @@ float_vectorcall(PyObject *type, PyObject * const*args,
}
/*[clinic input]
@classmethod
float.from_number
number: object
/
Convert real number to a floating-point number.
[clinic start generated code]*/
static PyObject *
float_from_number(PyTypeObject *type, PyObject *number)
/*[clinic end generated code: output=bbcf05529fe907a3 input=1f8424d9bc11866a]*/
{
if (PyFloat_CheckExact(number) && type == &PyFloat_Type) {
Py_INCREF(number);
return number;
}
double x = PyFloat_AsDouble(number);
if (x == -1.0 && PyErr_Occurred()) {
return NULL;
}
PyObject *result = PyFloat_FromDouble(x);
if (type != &PyFloat_Type && result != NULL) {
Py_SETREF(result, PyObject_CallOneArg((PyObject *)type, result));
}
return result;
}
/*[clinic input]
float.__getnewargs__
[clinic start generated code]*/
@ -1782,6 +1812,7 @@ float___format___impl(PyObject *self, PyObject *format_spec)
}
static PyMethodDef float_methods[] = {
FLOAT_FROM_NUMBER_METHODDEF
FLOAT_CONJUGATE_METHODDEF
FLOAT___TRUNC___METHODDEF
FLOAT___FLOOR___METHODDEF