Mercurial > cpython-lru_cache-weakref
diff Objects/complexobject.c @ 25064:81a36d2a2d13 legacy-trunk
complex() was the only numeric constructor that created a new instance
when given its own type as an argument.
| author | Raymond Hettinger <python@rcn.com> |
|---|---|
| date | Thu, 29 Aug 2002 14:22:51 +0000 |
| parents | a869d2de536f |
| children | 17bfd5dbc0f1 |
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--- a/Objects/complexobject.c Thu Aug 29 13:09:47 2002 +0000 +++ b/Objects/complexobject.c Thu Aug 29 14:22:51 2002 +0000 @@ -823,6 +823,15 @@ if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OO:complex", kwlist, &r, &i)) return NULL; + + /* Special-case for single argumet that is already complex */ + if (PyComplex_CheckExact(r) && i == NULL) { + /* Note that we can't know whether it's safe to return + a complex *subclass* instance as-is, hence the restriction + to exact complexes here. */ + Py_INCREF(r); + return r; + } if (PyString_Check(r) || PyUnicode_Check(r)) { if (i != NULL) { PyErr_SetString(PyExc_TypeError,