Function is

include/pybind11/pytypes.h:163–163

Equivalent to ``obj is other`` in Python.

    /// Equivalent to ``obj is other`` in Python.
    bool is(object_api const &other) const { return derived().ptr() == other.derived().ptr(); }
    /// Equivalent to ``obj is None`` in Python.
    bool is_none() const { return derived().ptr() == Py_None; }
    /// Equivalent to obj == other in Python