Function PyIterable_Check

include/pybind11/pytypes.h:1395–1403

using dict_iterator = generic_iterator<iterator_policies::dict_readonly>;

inline bool PyIterable_Check(PyObject *obj) {
    PyObject *iter = PyObject_GetIter(obj);
    if (iter) {
        Py_DECREF(iter);
        return true;
    }
    PyErr_Clear();
    return false;
}

inline bool PyNone_Check(PyObject *o) { return o == Py_None; }
inline bool PyEllipsis_Check(PyObject *o) { return o == Py_Ellipsis; }